100 r 221585 28.6 The 3n + 1 problem 101 r 37960 25.9 The Blocks Problem 102 r 40246 39.1 Ecological Bin Packing 103 y 18666 31.7 Stacking Boxes 104 y 15776 21.1 Arbitrage 105 r 25606 44.8 The Skyline Problem 106 r 17157 28.4 Fermat vs. Pythagoras 107 r 25398 16.8 The Cat in the Hat 108 r 22301 41.3 Maximum Sum 109 r 6400 30.1 SCUD Busters 110 y 6483 32.8 Meta-Loopless Sorts 111 r 10043 41.0 History Grading 112 r 17378 25.0 Tree Summing 113 r 18395 34.9 Power of Cryptography 114 r 4692 29.9 Simulation Wizardry 115 r 3554 35.6 Climbing Trees 116 r 18390 20.0 Unidirectional TSP 117 r 3956 49.0 The Postal Worker Rings Once 118 r 7751 38.4 Mutant Flatworld Explorers 119 r 12929 41.1 Greedy Gift Givers 120 y 9408 40.4 Stacks of Flapjacks 121 r 4532 39.4 Pipe Fitters 122 r 12064 27.8 Trees on the level 123 r 5095 36.5 Searching Quickly 124 r 4450 49.5 Following Orders 125 r 4915 33.1 Numbering Paths 126 r 2822 36.6 The Errant Physicist 127 r 4104 31.5 ``Accordian'' Patience 128 r 13869 49.5 Software CRC 129 r 2544 45.9 Krypton Factor 130 r 5226 40.5 Roman Roulette 131 r 1778 50.0 The Psychic Poker Player 132 r 1992 40.9 Bumpy Objects 133 r 5587 52.7 The Dole Queue 134 r 2488 26.1 Loglan-A Logical Language 135 y 2022 34.9 No Rectangles 136 r 27673 35.8 Ugly Numbers 137 r 2725 25.2 Polygons 138 r 9994 49.8 Street Numbers 139 r 6158 11.0 Telephone Tangles 140 r 2879 44.5 Bandwidth 141 r 2304 46.9 The Spot Game 142 r 4062 18.7 Mouse Clicks 143 r 9552 8.6 Orchard Trees 144 r 3527 48.5 Student Grants 145 r 5144 30.3 Gondwanaland Telecom 146 r 6461 50.3 ID Codes 147 r 16659 17.6 Dollars 148 r 3027 34.2 Anagram checker 149 r 865 41.0 Forests 150 r 1662 27.0 Double Time 151 r 8282 58.6 Power Crisis 152 r 3343 46.5 Tree's a Crowd 153 r 4326 32.5 Permalex 154 r 2806 55.0 Recycling 155 r 3996 62.3 All Squares 156 r 4316 49.7 Ananagrams 157 r 1514 29.8 Route Finding 158 r 2037 21.3 Calendar 159 r 3164 46.8 Word Crosses 160 r 14814 39.2 Factors and Factorials 161 r 3589 34.6 Traffic Lights 162 r 1531 44.1 Beggar My Neighbour 163 r 1040 14.5 City Directions 164 y 5825 30.4 String Computer 165 y 1827 37.0 Stamps 166 r 4048 36.2 Making Change 167 r 5607 56.0 The Sultan's Successors 168 r 4616 29.5 Theseus and the Minotaur 169 r 1642 19.7 Xenosemantics 170 r 2489 43.3 Clock Patience 171 r 2841 11.5 Car Trialling 172 r 1735 25.3 Calculator Language 173 r 2099 16.4 Network Wars 174 r 788 35.3 Strategy 175 r 1394 30.8 Keywords 176 r 495 32.3 City Navigation 177 r 1511 58.3 Paper Folding 178 r 882 42.6 Shuffling Patience 179 r 1607 24.1 Code Breaking 180 r 1857 18.6 Eeny Meeny 181 r 809 49.7 Hearts 182 r 570 50.4 Bonus Bonds 183 r 2543 29.1 Bit Maps 184 r 1886 43.3 Laser Lines 185 r 680 46.9 Roman Numerals 186 r 2083 48.4 Trip Routing 187 r 1893 49.6 Transaction Processing 188 r 1465 56.0 Perfect Hash 189 r 790 20.6 Pascal Program Lengths 190 r 7754 40.7 Circle Through Three Points 191 r 10405 19.0 Intersection 192 r 828 29.8 Synchronous Design 193 y 6547 27.3 Graph Coloring 194 y 1796 13.8 Triangle 195 r 18360 21.7 Anagram 196 r 3616 21.9 Spreadsheet 197 y 901 23.2 Cube 198 r 1554 17.6 Peter's Calculator 199 r 747 28.0 Partial differential equations 200 r 9556 30.4 Rare Order 201 r 4151 39.3 Squares 202 r 7152 37.2 Repeating Decimals 203 r 955 4.5 Running Lights Visibility Calculator 204 r 532 6.6 Robot Crash 205 r 404 10.6 Getting There 206 r 626 16.0 Meals on Wheels Routing System 207 r 508 11.8 PGA Tour Prize Money 208 r 3782 21.3 Firetruck 209 r 2308 31.6 Triangular Vertices 210 r 735 15.6 Concurrency Simulator 211 y 940 45.7 The Domino Effect 212 r 213 6.6 Use of Hospital Facilities 213 r 2052 38.7 Message Decoding 214 y 375 23.5 Code Generation 215 r 1016 30.9 Spreadsheet Calculator 216 y 3982 42.5 Getting in Line 217 r 49 18.4 Radio Direction Finder 218 y 4378 18.3 Moth Eradication 219 w 0 0.0 Department of Redundancy Department 220 r 2132 41.2 Othello 221 r 1971 28.9 Urban Elevations 222 r 2020 28.6 Budget Travel 223 r 222 11.7 Classifying Lots in a Subdivision 224 w 0 0.0 Kissin' Cousins 225 r 249 17.3 Golygons 226 y 425 37.2 MIDI Preprocessing 227 r 5913 36.5 Puzzle 228 w 0 0.0 Resource Allocation 229 y 682 25.8 Scanner 230 r 881 30.6 Borrowers 231 r 7406 50.4 Testing the CATCHER 232 r 3913 52.3 Crossword Answers 233 r 280 6.1 Package Pricing 234 y 143 39.2 Switching Channels 235 r 92 15.2 Typesetting 236 r 91 1.1 VTAS - Vessel Traffic Advisory Service 237 r 191 25.7 Monitoring Wheelchair Patients 238 y 574 16.4 Jill's Bike 239 r 488 31.8 Tempus et mobilius. Time and motion 240 r 612 27.0 Variable Radix Huffman Encoding 241 r 80 16.2 Sail Race 242 r 1209 44.8 Stamps and Envelope Size 243 r 677 7.7 Theseus and the Minotaur (II) 244 r 243 14.4 Train Time 245 r 1843 34.8 Uncompress 246 r 389 15.2 10-20-30 247 y 656 38.0 Calling Circles 248 r 193 6.2 Cutting Corners 249 r 139 16.5 Bang the Drum Slowly 250 r 728 26.8 Pattern Matching Prelims 251 r 625 22.7 Nondeterministic Trellis Automata 252 w 0 0.0 Trucking 253 r 3460 36.5 Cube painting 254 r 4523 18.0 Towers of Hanoi 255 r 1546 42.0 Correct Move 256 r 6973 55.7 Quirksome Squares 257 r 1695 19.7 Palinwords 258 y 1336 23.8 Mirror Maze 259 y 439 40.8 Software Allocation 260 r 2094 44.2 Il Gioco dell'X 261 r 656 34.9 The Window Property 262 r 998 5.6 Transferable Voting 263 r 3217 40.2 Number Chains 264 r 10061 54.4 Count on Cantor 265 y 664 9.5 Dining Diplomats 266 r 390 18.2 Stamping Out Stamps 267 r 989 31.6 Of(f) Course! 268 r 881 50.3 Double Trouble 269 r 252 31.3 Counting Patterns 270 r 6932 13.9 Lining Up 271 r 4918 39.5 Simply Syntax 272 r 18833 52.2 TEX Quotes 273 r 3615 26.9 Jack Straws 274 r 2188 19.4 Cat and Mouse 275 r 4222 44.7 Expanding Fractions 276 r 1924 28.3 Egyptian Multiplication 277 r 881 15.2 Cabinets 278 r 2440 58.1 Chess 279 r 74 33.8 Spin 280 r 3769 35.0 Vertex 281 r 80 20.0 Rubik's Cube 282 r 214 20.1 Rename 283 r 902 11.4 Compress 284 r 159 24.5 Logic 285 r 329 19.8 Crosswords 286 r 373 27.6 Dead Or Not -- That Is The Question 287 w 0 0.0 Text Comparsion 288 r 900 19.7 Arithmetic Operations With Large Integers 289 y 143 28.7 A Very Nasty Text Formatter 290 r 1568 38.9 Palindroms <---> smordnilaP 291 r 4013 64.3 The House Of Santa Claus 292 r 119 8.4 Presentation Error 293 r 360 10.0 Bits 294 r 7687 44.1 Divisors 295 r 118 18.6 Fatman 296 r 1180 40.6 Safebreaker 297 r 2575 42.1 Quadtrees 298 r 1069 27.3 Race Tracks 299 r 11551 53.4 Train Swapping 300 r 4897 36.2 Maya Calendar 301 r 2788 34.2 Transportation 302 r 3712 27.4 John's trip 303 r 757 36.2 Pipe 304 r 435 10.3 Department 305 r 7498 45.2 Joseph 306 r 6093 23.8 Cipher 307 r 8144 10.2 Sticks 308 r 1058 35.5 Tin Cutter 309 r 534 45.5 FORCAL 310 r 1486 10.2 L--system 311 r 3325 36.4 Packets 312 r 1268 39.1 Crosswords (II) 313 r 1501 31.5 Intervals 314 r 2557 25.8 Robot 315 r 4850 36.5 Network 316 y 985 9.9 Stars 317 r 433 23.8 Hexagon 318 r 2907 22.9 Domino Effect 319 r 473 28.1 Pendulum 320 r 3241 51.6 Border 321 y 1866 36.0 The New Villa 322 r 303 8.3 Ships 323 y 1980 11.1 Jury Compromise 324 r 7269 58.0 Factorial Frequencies 325 r 3288 31.9 Identifying Legal Pascal Real Constants 326 r 1964 61.3 Extrapolation Using a Difference Table 327 r 2142 31.5 Evaluating Simple C Expressions 328 r 701 26.0 The Finite State Text Processing Machine 329 y 662 6.3 PostScript Emulation 330 r 1469 18.5 Inventory Maintenance 331 r 1358 52.7 Mapping the Swaps 332 r 5158 24.2 Rational Numbers from Repeating Fractions 333 r 11431 21.7 Recognizing Good ISBNs 334 y 908 51.1 Identifying Concurrent Events 335 r 1006 24.0 Processing MX Records 336 r 7897 24.8 A Node Too Far 337 r 2164 61.6 Interpreting Control Sequences 338 y 4737 10.6 Long Multiplication 339 r 1484 42.3 SameGame Simulation 340 r 3257 59.6 Master-Mind Hints 341 r 649 60.4 Non-Stop Travel 342 r 330 15.8 HTML Syntax Checking 343 r 4709 29.8 What Base Is This? 344 r 6217 61.9 Roman Digititis 345 r 1393 29.5 It's Ir-Resist-Able! 346 r 1324 21.8 Getting Chorded 347 r 3021 18.7 Run, Run, Runaround Numbers 348 y 5486 40.6 Optimal Array Multiplication Sequence 349 r 976 39.4 Transferable Voting (II) 350 r 6957 53.0 Pseudo-Random Numbers 351 w 0 0.0 ``Cheapest'' Scores 352 r 3798 56.1 The Seasonal War 353 r 2652 42.0 Pesky Palindromes 354 r 91 5.5 Crazy Calculator 355 r 5199 24.4 The Bases Are Loaded 356 r 5312 51.5 Square Pegs And Round Holes 357 r 10448 18.8 Let Me Count The Ways 358 r 2422 15.4 Don't Have A Cow, Dude 359 r 392 12.5 Sex Assignments And Breeding Experiments 360 w 0 0.0 Don't Get Hives From This One! 361 r 2875 9.1 Cops and Robbers 362 r 2107 36.7 18,000 Seconds Remaining 363 w 0 0.0 Approximate Matches 364 w 0 0.0 Constitutional Computing 365 r 595 15.0 Welfare Reform 366 r 489 50.3 Cutting Up 367 r 433 21.0 Halting Factor Replacement Systems 368 w 0 0.0 Indexing Web Pages 369 r 13063 43.2 Combinations 370 r 355 16.6 Bingo 371 r 22428 23.2 Ackermann Functions 372 w 0 0.0 WhatFix Notation 373 y 1209 35.1 Romulan Spelling 374 r 10400 39.5 Big Mod 375 r 1924 41.3 Inscribed Circles and Isosceles Triangles 376 r 883 21.3 More Triangles ... THE AMBIGUOUS CASE 377 r 1640 63.4 Cowculations 378 r 4412 36.8 Intersecting Lines 379 r 931 67.3 Hi-Q 380 r 903 57.0 Call Forwarding 381 r 880 65.1 Making the Grade 382 r 13334 48.6 Perfection 383 r 2422 70.8 Shipping Routes 384 r 2122 51.1 Slurpys 385 y 1254 32.5 DNA Translation 386 r 6067 50.0 Perfect Cubes 387 y 1158 34.8 A Puzzling Problem 388 r 637 55.7 Galactic Import 389 r 6413 34.4 Basically Speaking 390 r 724 50.0 Letter Sequence Analysis 391 r 3382 29.9 Mark-up 392 r 9093 35.1 Polynomial Showdown 393 r 1030 41.2 The Doors 394 r 1152 68.0 Mapmaker 395 r 843 54.1 Board Silly 396 r 403 31.0 Top Dog 397 r 1743 49.4 Equation Elation 398 r 690 50.9 18-Wheeler Caravans (aka Semigroups) 399 r 800 47.8 Another Puzzling Problem 400 r 9894 39.7 Unix ls 401 r 16086 30.3 Palindromes 402 r 6975 34.8 M*A*S*H 403 r 1570 29.8 Postscript 404 r 868 15.3 Radar Scopes 405 r 763 43.6 Message Routing 406 r 15101 41.8 Prime Cuts 407 r 979 28.3 Gears on a Board 408 r 8137 64.4 Uniform Generator 409 r 3664 40.0 Excuses, Excuses! 410 y 2404 21.5 Station Balance 411 r 626 41.7 Centipede Collisions 412 r 11110 36.0 Pi 413 r 2563 57.7 Up and Down Sequences 414 r 4448 50.9 Machined Surfaces 415 y 886 47.6 Sunrise 416 r 1522 36.9 LED Test 417 r 3341 62.0 Word Index 418 r 1345 54.3 Molecules 419 r 585 30.4 Matching Meetings 420 r 212 53.3 Supercomputer Selection, The Sequel 421 r 375 24.5 Polygonal Puzzle 422 r 2419 51.7 Word-Search Wonder 423 r 2215 56.2 MPI Maelstrom 424 r 10826 48.8 Integer Inquiry 425 r 1184 32.3 Enigmatic Encryption 426 r 1246 38.5 Fifth Bank of Swamp County 427 r 846 45.7 FlatLand Piano Movers 428 r 638 49.8 Swamp County Roofs 429 r 3984 29.3 Word Transformation 430 r 978 33.2 Swamp County Supervisors 431 y 779 23.0 Trial of the Millennium 432 r 718 51.0 Modern Art 433 r 944 30.4 Bank (Not Quite O.C.R.) 434 r 1785 36.2 Matty's Blocks 435 r 1486 63.8 Block Voting 436 r 2628 44.6 Arbitrage (II) 437 r 2073 49.3 The Tower of Babylon 438 r 5096 65.3 The Circumference of the Circle 439 r 6417 51.2 Knight Moves 440 r 4887 68.4 Eeny Meeny Moo 441 r 6250 75.2 Lotto 442 r 2728 60.1 Matrix Chain Multiplication 443 r 8350 39.7 Humble Numbers 444 r 9659 34.9 Encoder and Decoder 445 r 8314 58.4 Marvelous Mazes 446 r 5450 52.1 Kibbles ``n'' Bits ``n'' Bits ``n'' Bits 447 r 2018 48.1 Population Explosion 448 r 3060 50.0 OOPS! 449 r 1402 41.2 Majoring in Scales 450 r 6954 30.4 Little Black Book 451 r 1461 37.9 Poker Solitaire Evaluator 452 r 1354 26.9 Project Scheduling 453 y 3764 8.2 Intersecting Circles 454 r 4932 25.6 Anagrams 455 r 6518 40.3 Periodic Strings 456 w 0 0.0 Robotic Stacker 457 r 1736 52.9 Linear Cellular Automata 458 r 15701 56.9 The Decoder 459 r 7464 28.7 Graph Connectivity 460 r 3194 44.0 Overlapping Rectangles 461 w 0 0.0 The Reservation Maker 462 r 1350 45.8 Bridge Hand Evaluator 463 r 221 5.9 Polynomial Factorization 464 r 951 55.3 Sentence/Phrase Generator 465 r 6932 19.9 Overflow 466 r 1517 57.7 Mirror, Mirror 467 r 1513 46.0 Synching Signals 468 r 2924 33.0 Key to Success 469 r 3945 33.9 Wetlands of Florida 470 w 0 0.0 Nasty Virus 471 r 3135 38.2 Magic Numbers 472 w 0 0.0 Simultaneous Equations 473 r 320 16.9 Raucous Rockers 474 r 4981 35.7 Heads / Tails Probability 475 r 207 19.8 Wild Thing 476 r 11657 37.8 Points in Figures: Rectangles 477 r 5413 59.4 Points in Figures: Rectangles and Circles 478 r 5036 43.4 Points in Figures: Rectangles, Circles, Triangles 479 w 0 0.0 Irrigation Flow Rates 480 w 0 0.0 Tempus Fugit 481 r 4394 17.8 What Goes Up 482 r 8408 21.9 Permutation Arrays 483 r 13125 40.8 Word Scramble 484 r 8188 39.2 The Department of Redundancy Department 485 r 6721 26.4 Pascal's Triangle of Death 486 r 3326 35.7 English-Number Translator 487 r 1629 31.4 Boggle Blitz 488 r 15678 46.5 Triangle Wave 489 r 4451 57.7 Hangman Judge 490 r 7706 42.6 Rotating Sentences 491 r 452 20.6 Tile Topology 492 r 18274 27.0 Pig-Latin 493 r 1721 35.3 Rational Spiral 494 r 14133 41.1 Kindergarten Counting Game 495 r 29916 24.8 Fibonacci Freeze 496 r 4696 51.4 Simply Subsets 497 r 10018 23.4 Strategic Defense Initiative 498 r 5649 57.2 Polly the Polynomial 499 r 7754 57.9 What's The Frequency, Kenneth? 500 r 2122 14.0 Table 501 r 4720 19.6 Black Box 502 y 1556 8.8 DEL command 503 r 602 18.3 Parallelepiped walk 504 r 760 11.2 Random number 505 r 1386 19.4 Moscow time 506 y 940 12.0 System Dependencies 507 r 3954 33.0 Jill Rides Again 508 w 0 0.0 Morse Mismatches 509 w 0 0.0 RAID! 510 w 0 0.0 Optimal Routing 511 w 0 0.0 Do You Know the Way to San Jose? 512 r 816 34.1 Spreadsheet Tracking 513 w 0 0.0 Window Frames 514 r 4824 50.0 Rails 515 r 1898 9.7 King 516 r 4100 49.4 Prime Land 517 r 2042 25.1 Word 518 r 1176 27.8 Time 519 r 1250 23.0 Puzzle (II) 520 r 1448 31.7 Append 521 r 801 41.4 Gossiping 522 w 0 0.0 Schedule Problem 523 y 3446 22.8 Minimum Transport Cost 524 r 7614 58.1 Prime Ring Problem 525 y 46 17.4 Milk Bottle Data 526 y 2904 33.1 String Distance and Transform Process 527 r 1544 12.6 The partition of a cake 528 w 0 0.0 The Problem of Train Setout 529 y 2598 20.1 Addition Chains 530 r 16293 22.8 Binomial Showdown 531 y 5456 36.1 Compromise 532 r 5560 33.3 Dungeon Master 533 r 1266 49.7 Equation Solver 534 r 5397 41.8 Frogger 535 r 2125 31.0 Globetrotter 536 r 3946 60.0 Tree Recovery 537 r 3614 45.7 Artificial Intelligence? 538 y 1258 49.1 Balancing Bank Accounts 539 r 2040 56.0 The Settlers of Catan 540 r 2580 33.5 Team Queue 541 r 7795 62.1 Error Correction 542 r 1528 65.4 France '98 543 r 13726 42.0 Goldbach's Conjecture 544 r 3587 50.9 Heavy Cargo 545 r 4229 15.3 Heads 546 r 212 18.9 Image Recognizer 547 r 1766 34.7 DDF 548 r 2408 24.0 Tree 549 r 326 15.6 Evaluating an Equations Board 550 r 1355 45.5 Multiplying by Rotation 551 r 2592 34.7 Nesting a Bunch of Brackets 552 r 763 30.7 Filling the Gaps 553 r 298 46.6 Simply proportion 554 r 2113 27.1 Caesar Cypher 555 r 3248 51.0 Bridge Hands 556 r 1110 58.8 Amazing 557 y 1891 22.7 Burger 558 r 3631 37.9 Wormholes 559 r 748 30.2 Squares (II) 560 r 1450 16.3 Magic 561 y 802 36.8 Jackpot 562 r 7219 29.2 Dividing coins 563 r 1537 19.4 Crimewave 564 r 340 20.0 Gaston 565 y 1595 43.8 Pizza Anyone? 566 r 3104 5.7 Adam's Genes 567 r 3673 59.9 Risk 568 r 6595 61.5 Just the Facts 569 r 625 7.8 Horse Shoe Scoring 570 r 499 60.7 Stats 571 y 2622 39.2 Jugs 572 r 5220 56.8 Oil Deposits 573 r 4769 47.1 The Snail 574 r 3438 41.1 Sum It Up 575 r 6635 70.6 Skew Binary 576 r 3586 60.0 Haiku Review 577 r 575 22.3 WIMP 578 r 243 28.4 Polygon Puzzler 579 r 10735 44.3 ClockHands 580 r 1799 54.8 Critical Mass 581 r 793 8.3 Word Search Wonder 582 w 0 0.0 Randomly Wired Neural Nets 583 r 18624 30.8 Prime Factors 584 r 1485 45.6 Bowling 585 r 3439 31.2 Triangles 586 r 1349 40.1 Instant Complexity 587 r 5537 30.1 There's treasure everywhere! 588 r 1182 42.5 Video Surveillance 589 y 7711 9.8 Pushing Boxes 590 r 1145 57.9 Always on the run 591 r 17990 50.4 Box of Bricks 592 r 935 33.7 Island of Logic 593 r 515 38.4 MBone 594 r 2649 66.3 One Little, Two Little, Three Little Endians 595 r 535 38.5 A Major Problem 596 w 0 0.0 The Incredible Hull 597 w 0 0.0 Last Name First, Please 598 r 2979 34.9 Bundling Newspapers 599 r 604 40.7 The Forrest for the Trees 600 r 1131 14.1 A Duckpin Tournament 601 r 2088 31.2 The PATH 602 r 6570 29.5 What Day Is It? 603 r 2570 23.1 Parking Lot 604 r 1830 32.3 The Boggle Game 605 y 330 8.2 The Rotating Disk 606 r 635 24.4 Keeps Going and Going and ... 607 r 2992 20.1 Scheduling Lectures 608 r 3393 31.5 Counterfeit Dollar 609 r 1220 28.9 Metal Cutting 610 y 1100 25.4 Street Directions 611 r 396 22.0 Parallel Deadlock 612 r 14930 29.8 DNA Sorting 613 r 2291 15.3 Numbers That Count 614 r 1173 58.7 Mapping the Route 615 r 8144 14.8 Is It A Tree? 616 r 3817 15.5 Coconuts, Revisited 617 r 1250 49.6 Nonstop Travel 618 r 795 29.4 Doing Windows 619 r 2927 53.5 Numerically Speaking 620 r 1693 50.7 Cellular Structure 621 r 5033 53.0 Secret Research 622 r 1530 33.3 Grammar Evaluation 623 r 18371 16.4 500! 624 y 4482 41.8 CD 625 r 977 30.8 Compression 626 r 1695 49.5 Ecosystem 627 r 1286 45.5 The Net 628 r 2018 59.3 Passwords 629 y 459 53.4 Test 630 r 3325 38.1 Anagrams (II) 631 r 487 16.2 Microzoft Calendar 632 r 2108 29.3 Compression (II) 633 r 2375 14.4 A Chess Knight 634 r 1164 52.1 Polygon 635 r 379 51.7 Clock solitaire 636 r 2295 56.5 Squares (III) 637 r 3244 59.0 Booklet Printing 638 r 1858 40.2 Finding Rectangles 639 r 1932 64.5 Don't Get Rooked 640 r 7889 46.4 Self Numbers 641 r 1513 68.0 Do the Untwist 642 r 2894 54.3 Word Amalgamation 643 r 468 37.4 Bulk Mailing 644 r 2332 49.5 Immediate Decodability 645 r 831 43.9 File Mapping 646 y 101 16.8 The Gourmet Club 647 r 739 62.5 Chutes and Ladders 648 r 473 36.8 Stamps (II) 649 w 0 0.0 You Who? 650 r 525 44.4 Bowl 651 r 1272 63.1 Deck 652 y 3704 18.4 Eight 653 r 923 28.6 Gizilch 654 r 1757 43.5 Ratio 655 r 696 11.9 Scrabble 656 r 1213 38.4 Optimal Programs 657 r 1685 48.4 The die is cast 658 r 1698 28.0 It's not a Bug, it's a Feature! 659 r 490 45.3 Reflections 660 r 456 33.6 Going in circles on Alpha Centauri 661 r 4308 39.7 Blowing Fuses 662 y 1055 35.2 Fast Food 663 r 1755 20.7 Sorting Slides 664 r 481 25.6 Single-Player Games 665 r 2066 33.6 False coin 666 y 267 10.5 Rating 667 r 469 29.2 Fence 668 r 1705 45.2 Parliament 669 y 1037 26.2 Defragment 670 y 2844 23.5 The dog task 671 r 1669 31.1 Spell checker 672 r 1649 35.4 Gangsters 673 r 17575 36.3 Parentheses Balance 674 r 7813 46.1 Coin Change 675 w 0 0.0 Convex Hull of the Polygon 676 r 968 20.4 Horse Step Maze 677 r 1733 42.6 All Walks of length ``n'' from the first node 678 y 182 42.3 Schedule of Taiwan Baseball League 679 r 2197 50.5 Dropping Balls 680 r 478 36.4 Movement of Reading Head 681 r 5319 20.6 Convex Hull Finding 682 r 482 34.6 Whoever-pick-the-last-one-lose 683 r 238 21.0 Character Decoding 684 r 1877 16.2 Integral Determinant 685 r 691 33.3 Least Path Cost 686 r 8993 49.5 Goldbach's Conjecture (II) 687 r 182 13.7 Lattice Practices 688 r 1847 35.6 Mobile Phone Coverage 689 y 1036 9.5 Napoleon's Grumble 690 r 500 18.6 Pipeline Scheduling 691 y 1032 2.0 Triangle Partition 692 r 420 22.1 BUT We Need a Diagram 693 r 125 11.2 Digital Racing Circuit 694 r 8731 42.4 The Collatz Sequence 695 y 944 32.5 Placing the Ops 696 r 3131 36.6 How Many Knights 697 r 2327 41.5 Jack and Jill 698 r 1852 22.5 Index 699 r 2678 60.5 The Falling Leaves 700 r 3510 32.9 Date Bugs 701 r 12952 31.3 The Archeologists' Dilemma 702 r 1144 35.3 The Vindictive Coach 703 r 1473 44.3 Triple Ties: The Organizer's Nightmare 704 r 2206 40.7 Colour Hash 705 r 1337 42.2 Slash Maze 706 y 16611 38.2 LCD Display 707 r 1268 39.4 Robbery 708 y 1373 14.9 Dreisam Equations 709 r 966 16.3 Formatting Text 710 r 1892 27.0 The Game 711 r 5950 17.2 Dividing up 712 r 1836 60.3 S-Trees 713 r 13125 21.6 Adding Reversed Numbers 714 r 4455 16.5 Copying Books 715 r 1125 9.9 Substitution Cipher 716 r 608 43.9 Commedia dell' arte 717 w 5 0.0 Calculating Expressions on Turing Machine 718 r 2170 22.0 Skyscraper Floors 719 r 2926 15.1 Glass Beads 720 r 454 5.1 Hares and Foxes 721 r 2470 19.8 Invitation Cards 722 r 327 32.1 Lakes 723 y 213 9.9 Comment Removal 724 w 0 0.0 Reverse 725 r 4198 48.7 Division 726 r 3145 23.2 Decode 727 r 5749 30.1 Equation 728 r 528 12.7 Scatter Point Plot 729 r 7798 48.4 The Hamming Distance Problem 730 r 675 5.3 Morse Code Generation 731 y 742 28.6 Numerical Summation of a Series 732 r 1574 35.3 Anagrams by Stack 733 y 451 20.6 Follow the Folding Dot 734 y 452 34.3 The Programmer's Hex 735 r 1029 48.2 Dart-a-Mania 736 r 1295 30.0 Lost in Space 737 r 1563 48.6 Gleaming the Cubes 738 r 388 32.0 A Logical Problem 739 r 4659 50.1 Soundex Indexing 740 r 2657 64.1 Baudot Data Communication Code 741 r 1521 48.6 Burrows Wheeler Decoder 742 r 798 32.0 Domino Game 743 r 1474 41.2 The MTM Machine 744 y 582 19.9 Triangular Museum 745 r 680 48.2 Numeric Puzzles Again! 746 r 279 10.4 Polygon Visibility 747 r 666 36.3 Grid Soccer 748 r 1935 60.7 Exponentiation 749 r 217 6.5 Machine Repair Simulation 750 r 7506 37.2 8 Queens Chess Problem 751 r 1624 12.4 Triangle War 752 r 1243 26.6 Unscrambling Images 753 r 1848 24.0 A Plug for UNIX 754 r 577 30.2 Treasure Hunt 755 r 11926 25.5 487--3279 756 r 3378 20.6 Biorhythms 757 r 2169 12.4 Gone Fishing 758 r 1633 21.6 The Same Game 759 r 1887 23.2 The Return of the Roman Empire 760 r 2058 18.3 DNA Sequencing 761 w 0 0.0 Transform those strings 762 y 3891 29.1 We Ship Cheap 763 r 3290 26.2 Fibinary Numbers 764 y 695 14.0 Pentominos 765 r 768 33.1 References 766 r 587 33.6 Sum of powers 767 r 790 19.5 Game 768 w 0 0.0 Crossword 769 y 98 43.9 Magic of David Copperfield 770 w 0 0.0 Puncher 771 w 0 0.0 Flying Stars 772 w 0 0.0 Divide et unita 773 w 0 0.0 The JustaPox Language 774 w 0 0.0 Driving in City Squares 775 y 407 42.5 Hamiltonian Cycle 776 r 1840 36.8 Monkeys in a Regular Forest 777 r 246 19.1 Codebreakers 778 w 0 0.0 Recording a tape 779 w 0 0.0 Wily Hacker's Problem 780 w 0 0.0 Sentence Generator 781 w 0 0.0 Optimisation 782 r 2356 21.4 Contour Painting 783 r 909 29.4 Trains 784 r 4097 52.1 Maze Exploration 785 r 3556 36.6 Grid Colouring 786 r 161 11.2 Working with Relations 787 r 1609 19.5 Maximum Sub-sequence Product 788 w 0 0.0 One Day Tours 789 w 0 0.0 Indexing 790 r 1401 8.3 Head Judge Headache 791 w 0 0.0 Term Reductions 792 w 0 0.0 Program Modules 793 r 9377 29.9 Network Connections 794 r 136 14.0 Straightest Paths 795 r 463 34.3 Sandorf's Cipher 796 r 2531 29.2 Critical Links 797 r 53 39.6 Two Way Traffic 798 r 53 37.7 Tile Puzzle 799 r 701 30.2 Safari Holiday 800 w 0 0.0 Crystal Clear 801 r 36 27.8 Flight Planning 802 r 598 14.5 Lead or Gold 803 w 0 0.0 Page Selection by Keyword Matching 804 r 291 22.7 Petri Net Simulation 805 w 0 0.0 Polygon Intersections 806 r 342 43.9 Spatial Structures 807 r 145 20.7 Towers of Powers 808 r 2659 41.0 Bee Breeding 809 r 705 7.0 Bullet Hole 810 y 991 39.1 A Dicey Problem 811 r 978 33.4 The Fortified Forest 812 r 2008 36.8 Trade on Verweggistan 813 r 340 10.6 Robot 814 r 1137 25.6 The Letter Carrier's Rounds 815 y 1650 37.6 Flooded! 816 y 354 30.8 Abbott's Revenge 817 r 664 16.3 According to Bartjens 818 r 188 38.3 Cutting Chains 819 r 347 17.3 Gifts Large and Small 820 r 2992 35.3 Internet Bandwidth 821 r 1420 56.3 Page Hopping 822 r 132 32.6 Queue and A 823 r 215 23.3 Stopper Stumper 824 r 619 47.2 Coast Tracker 825 r 3056 32.5 Walking on the Safe Side 826 r 740 9.9 Symbolic Numerical System 827 r 306 18.6 Buddy Memory Allocator 828 r 601 33.6 Deciphering Messages 829 r 398 22.4 Almost Balanced Trees 830 r 494 35.8 Shark 831 r 422 37.2 Document Validator 832 r 548 18.8 Financial Risk 833 r 1200 57.8 Water Falls 834 r 4387 62.0 Continued Fractions 835 r 906 25.4 Square of Primes 836 r 3800 48.6 Largest Submatrix 837 r 1117 48.2 Light and Transparencies 838 r 1401 17.9 Worm World 839 r 2949 48.5 Not so Mobile 840 r 422 28.9 Deadlock Detection 841 r 1098 12.5 Snake 842 r 290 31.0 Crossword Puzzles 843 y 5135 20.4 Crypt Kicker 844 r 350 41.7 Pousse 845 r 1255 23.3 Gas Station Numbers 846 r 4286 43.3 Steps 847 r 4334 48.1 A Multiplication Game 848 y 1275 8.0 Fmt 849 r 353 5.1 Radar Tracking 850 r 4864 20.5 Crypt Kicker II 851 y 1671 26.4 Maze 852 r 540 44.3 Deciding victory in Go 853 r 293 23.9 DVD Subtitles 854 r 98 17.3 Worse Code 855 r 1882 34.1 Lunch in Grid City 856 r 522 49.4 The Vigenère Cipher 857 r 359 38.2 Quantiser 858 r 578 46.7 Berry Picking 859 r 403 21.1 Chinese Checkers 860 r 684 22.4 Entropy Text Analyzer 861 r 3335 31.8 Little Bishops 862 r 76 30.3 Origami 863 y 192 0.5 Process Scheduling 864 r 61 31.1 Scheme Pretty-Printing 865 r 989 38.0 Substitution Cypher 866 r 401 66.3 Intersecting Line Segments 867 w 0 0.0 Storing Images in a Sequence 868 r 430 13.7 Numerical Maze 869 r 713 69.4 Airline Comparison 870 r 231 51.9 Intersecting Rectangles 871 r 802 42.1 Counting Cells in a Blob 872 r 358 48.9 Ordering 873 r 162 46.9 Loan (II) 874 r 275 42.2 2D Representations 875 w 0 0.0 Monopoly 876 w 0 0.0 Balanced Expressions 877 r 164 29.3 Offset Polygons 878 r 430 25.6 Rotating Tetris Pieces 879 r 294 19.7 Circuit Nets 880 r 1571 30.2 Cantor Fractions 881 r 236 26.3 Points, Polygons and Containers 882 r 160 74.4 The Mailbox Manufacturers Problem 883 r 152 56.6 Overlapping Rectangles 884 r 3854 43.5 Factorial Factors 885 r 240 8.3 Telephone Directory Alphabetization 886 r 84 16.7 Named Extension Dialing 887 r 68 25.0 Revolutionary Calendar 888 r 144 10.4 Donkey 889 r 62 30.6 Islands 890 r 70 38.6 Maze (II) 891 r 99 29.3 Syntrax 892 r 873 61.3 Finding words 893 r 537 34.5 Y3K Problem 894 r 39 17.9 Juggling Trams 895 r 1547 55.6 Word Problem 896 r 17 5.9 Board Game 897 r 736 48.4 Anagrammatic Primes 898 r 239 31.0 Hole Cutter 899 r 238 47.9 Colour Circles 10000 r 11922 24.2 Longest Paths 10001 r 2142 32.2 Garden of Eden 10002 r 5744 22.4 Center of Masses 10003 r 7291 42.5 Cutting Sticks 10004 r 14369 42.0 Bicoloring 10005 r 4454 22.2 Packing polygons 10006 r 12629 37.5 Carmichael Numbers 10007 r 3650 29.0 Count the Trees 10008 r 8959 56.1 What's Cryptanalysis? 10009 r 6135 39.8 All Roads Lead Where? 10010 r 7013 43.9 Where's Waldorf? 10011 r 2724 7.0 Where Can You Hide? 10012 r 3440 27.0 How Big Is It? 10013 r 23320 42.6 Super long sums 10014 r 4319 44.2 Simple calculations 10015 r 3335 52.5 Joseph's Cousin 10016 r 1576 60.6 Flip-Flop the Squarelotron 10017 r 2394 50.4 The Never Ending Towers of Hanoi 10018 r 30935 39.8 Reverse and Add 10019 r 4975 74.3 Funny Encryption Method 10020 y 4745 26.3 Minimal coverage 10021 r 1124 24.8 Cube in the labirint 10022 r 1674 47.1 Delta-wave 10023 r 8190 4.5 Square root 10024 r 1072 36.8 Curling up the cube 10025 r 5511 36.0 The ? 1 ? 2 ? ... ? n = k problem 10026 r 4363 48.2 Shoemaker's Problem 10027 r 1700 15.3 Language Cardinality 10028 r 871 25.6 Demerit Points 10029 r 4100 14.5 Edit Step Ladders 10030 r 397 25.2 Computer Dialogue 10031 r 820 5.1 Saskatchewan 10032 r 6302 21.0 Tug of War 10033 r 15574 26.4 Interpreter 10034 r 9164 36.7 Freckles 10035 r 23263 30.9 Primary Arithmetic 10036 r 4067 34.1 Divisibility 10037 y 4850 21.2 Bridge 10038 r 34330 30.3 Jolly Jumpers 10039 r 2013 27.9 Railroads 10040 r 2152 39.2 Ouroboros Snake 10041 r 13257 37.5 Vito's Family 10042 r 6275 29.9 Smith Numbers 10043 r 3637 28.5 Chainsaw Massacre 10044 r 9505 14.9 Erdos Numbers 10045 r 1591 25.5 Echo 10046 r 93 19.4 Fold-up Patterns 10047 r 1242 41.9 The Monocycle 10048 r 3577 56.8 Audiophobia 10049 r 2855 51.5 Self-describing Sequence 10050 r 5493 57.5 Hartals 10051 y 2378 35.4 Tower of Cubes 10052 y 1621 9.5 Inviting Politicians 10053 y 798 18.8 Envelopes 10054 y 4667 20.3 The Necklace 10055 r 38753 29.0 Hashmat the Brave Warrior 10056 r 3171 36.5 What is the Probability ? 10057 r 2898 29.0 A mid-summer night's dream. 10058 r 1050 30.4 Jimmi's Riddles 10059 r 191 1.6 The Hazard of CSE Department! 10060 r 1440 34.0 A hole to catch a man 10061 r 2844 22.4 How many zero's and how many digits ? 10062 r 16344 37.8 Tell me the frequencies! 10063 r 2387 60.5 Knuth's Permutation 10064 r 395 11.9 Travelling in another Dimension 10065 r 1875 33.8 Useless Tile Packers 10066 r 4689 56.2 The Twin Towers 10067 r 3874 39.5 Playing with Wheels 10068 y 1194 26.9 The Treasure Hunt 10069 r 4081 26.8 Distinct Subsequences 10070 r 12043 21.2 Leap Year or Not Leap Year and ... 10071 r 22937 53.5 Back to High School Physics 10072 y 705 32.3 Bob Laptop Woolmer and Eddie Desktop Barlow 10073 y 741 30.8 Constrained Exchange Sort 10074 r 4328 48.8 Take the Land 10075 r 951 45.4 Airlines 10076 r 755 25.2 The Bumpy Robot 10077 r 2014 60.7 The Stern-Brocot Number System 10078 r 1847 46.7 The Art Gallery 10079 r 9194 39.2 Pizza Cutting 10080 r 4463 29.3 Gopher II 10081 r 1506 52.0 Tight Words 10082 r 13368 43.5 WERTYU 10083 r 1832 18.4 Division 10084 r 575 25.9 Hotter Colder 10085 y 699 42.9 The most distant state 10086 y 792 35.9 Test the Rods 10087 y 377 27.1 The Tajmahal of ++Y2k 10088 r 2442 32.4 Trees on My Island 10089 r 1306 20.4 Repackaging 10090 r 3681 16.3 Marbles 10091 r 795 24.9 The Valentine's Day 10092 y 2020 28.8 The Problem with the Problem Setter 10093 r 6743 16.8 An Easy Problem! 10094 y 1255 32.7 Place the Guards 10095 r 633 16.9 Saving the Planet 10096 r 1304 1.7 The Richest Man of the Universe 10097 r 767 61.3 The Color Game 10098 r 9012 53.7 Generating Fast, Sorted Permutation 10099 r 7180 35.6 The Tourist Guide 10100 r 6164 20.3 Longest Match 10101 r 7266 22.0 Bangla Numbers 10102 r 4330 33.3 The path in the colored field 10103 r 635 7.6 Karpovich blocks 10104 r 5430 38.3 Euclid Problem 10105 r 3439 62.3 Polynomial Coefficients 10106 r 10921 37.4 Product 10107 r 10232 43.2 What is the Median? 10108 r 519 10.2 The Mosquito Killer Mosquitos 10109 r 1355 26.6 Solving Systems of Linear Equations 10110 r 18317 32.7 Light, More Light 10111 r 1002 34.7 Find the Winning Move 10112 r 1331 53.4 Myacm Triangles 10113 r 734 51.2 Exchange Rates 10114 r 505 39.2 Loansome Car Buyer 10115 r 1612 50.1 Automatic Editing 10116 r 2916 50.1 Robot Motion 10117 r 577 25.8 Nice Milk 10118 r 802 32.9 Free Candies 10119 r 1008 5.8 Farewell, my friend 10120 r 1657 30.4 Gift?! 10121 r 174 37.9 Legendary Pokemon 10122 r 795 23.5 Mysterious Mountain 10123 y 659 31.4 No Tipping 10124 r 368 38.3 Subway 10125 r 7611 18.0 Sumsets 10126 r 2999 27.2 Zipf's Law 10127 r 6885 54.4 Ones 10128 r 1962 49.1 Queue 10129 r 6074 22.8 Play on Words 10130 r 3630 48.5 SuperSale 10131 y 6391 37.5 Is Bigger Smarter? 10132 r 1901 35.9 File Fragmentation 10133 r 254 37.4 Audubon's Stormy Arctic Trip 10134 r 809 38.4 AutoFish 10135 r 1485 4.7 Herding Frosh 10136 r 1089 26.0 Chocolate Chip Cookies 10137 r 14727 16.7 The Trip 10138 r 1355 16.5 CDVII 10139 r 10069 16.3 Factovisors 10140 r 5044 25.4 Prime Distance 10141 r 2657 35.3 Request for Proposal 10142 r 10770 16.2 Australian Voting 10143 y 208 24.5 Loan 10144 y 549 42.1 Expression 10145 r 470 37.4 Lock Manager 10146 y 1647 29.7 Dictionary 10147 y 3685 22.9 Highways 10148 y 1128 29.0 Advertisement 10149 y 1348 26.9 Yahtzee 10150 y 4295 15.6 Doublets 10151 r 246 11.0 Spaghetti 10152 y 11910 40.0 ShellSort 10153 r 323 13.0 New Horizons 10154 r 5021 13.7 Weights and Measures 10155 r 208 45.2 Green Eggs and Ham 10156 r 857 26.3 Sala-ma-Sond, A Nice Little Pond 10157 r 1679 21.5 Expressions 10158 r 2461 17.4 War 10159 r 673 12.2 Star 10160 r 3019 15.6 Servicing Stations 10161 r 4503 59.4 Ant on a Chessboard 10162 r 2813 39.7 Last Digit 10163 r 476 30.0 Storage Keepers 10164 y 1598 33.2 Number Game 10165 r 1166 51.5 Stone Game 10166 r 478 25.5 Travel 10167 y 1427 23.9 Birthday Cake 10168 y 5513 34.5 Summation of Four Primes 10169 r 868 24.3 Urn-ball Probabilities ! 10170 r 2530 52.8 The Hotel with Infinite Rooms 10171 r 2175 25.7 Meeting Prof. Miguel... 10172 r 232 58.2 The Lonesome Cargo Distributor 10173 r 1791 20.3 Smallest Bounding Rectangle 10174 y 1563 26.7 Couple-Bachelor-Spinster Numbers. 10175 r 581 38.0 Sphere 10176 r 2929 37.0 Ocean Deep ! - Make it shallow !! 10177 r 1295 52.9 (2/3/4)-D Sqr/Rects/Cubes/Boxes? 10178 r 1859 25.0 Count the Faces. 10179 r 3557 42.7 Irreducable Basic Fractions 10180 r 2575 10.5 Rope Crisis in Ropeland! 10181 y 7778 19.6 15-Puzzle Problem 10182 r 2500 58.7 Bee Maja 10183 r 5672 27.0 How Many Fibs? 10184 r 289 43.9 Equidistance 10185 y 310 38.4 Phylogenetic Trees Inherited 10186 r 274 55.8 Euro Cup 2000 10187 r 3539 30.3 From Dusk Till Dawn 10188 r 3974 25.6 Automated Judge Script 10189 r 20652 43.9 Minesweeper 10190 r 7349 21.7 Divide, But Not Quite Conquer! 10191 r 4474 29.7 Longest Nap 10192 r 5773 35.5 Vacation 10193 r 3417 49.0 All You Need Is Love 10194 r 4542 21.4 Football (aka Soccer) 10195 r 6927 30.7 The Knights Of The Round Table 10196 r 5956 27.4 Check The Check 10197 r 2165 32.8 Learning Portuguese 10198 r 4098 38.7 Counting 10199 r 2737 28.7 Tourist Guide 10200 r 10496 30.3 Prime Time 10201 r 2719 25.9 Adventures in Moving - Part IV 10202 y 1502 43.3 Pairsumonious Numbers 10203 r 1438 28.9 Snow Clearing 10204 r 334 19.8 Adventures in Moving - Part V 10205 r 3768 33.0 Stack 'em Up 10206 r 252 37.3 Stars 10207 r 1654 12.4 The Unreal Tournament 10208 r 665 34.0 Liar or Not Liar that is the... 10209 y 5353 50.9 Is This Integration ? 10210 r 922 57.2 Romeo and Juliet ! 10211 r 456 34.2 Divisibility Testing! Wow! 10212 r 3957 12.2 The Last Non-zero Digit. 10213 r 2938 23.4 How Many Pieces of Land ? 10214 y 699 40.6 Trees in a Wood. 10215 r 4548 34.5 The Largest/Smallest Box ... 10216 r 654 13.5 The Optimal Coffee Shop!! 10217 r 922 37.5 A Dinner with Schwarzenegger!!! 10218 y 464 59.3 Let's Dance !!! 10219 r 3207 41.2 Find the ways ! 10220 r 4286 60.7 I Love Big Numbers ! 10221 r 4741 30.3 Satellites 10222 r 5634 61.9 Decode the Mad man 10223 r 2296 51.4 How many nodes ? 10224 r 537 15.3 Return of the Jedi 10225 r 441 52.8 Discrete Logging 10226 r 4911 22.3 Hardwood Species 10227 r 1625 35.8 Forests 10228 r 1067 32.6 Star not a Tree? 10229 r 2932 33.9 Modular Fibonacci 10230 y 647 30.1 Savage Garden 10231 r 585 31.3 Matrix World 10232 r 544 62.7 Bit-wise Sequence 10233 r 955 47.3 Dermuba Triangle 10234 r 1726 21.6 Frequent Substrings 10235 r 7800 30.6 Simply Emirp 10236 r 1900 23.5 The Fibonacci Primes 10237 r 685 35.6 Bishops 10238 r 1193 25.1 Throw the Dice 10239 r 907 26.9 The Book-shelver's Problem 10240 r 379 26.6 The n-Dimensional Cities 10241 r 118 39.0 Semi-triangular and also Square 10242 r 2769 40.0 Fourth Point !! 10243 r 1099 27.2 Fire! Fire!! Fire!!! 10244 y 571 38.7 First Love !!! 10245 r 7451 17.3 The Closest Pair Problem 10246 r 1899 30.1 Asterix and Obelix 10247 r 843 27.3 Complete Tree Labeling 10248 y 1002 35.0 The Integer All-time Champ 10249 y 2343 32.2 The Grand Dinner 10250 y 758 48.5 The Other Two Trees 10251 r 459 33.1 Min-Max Cake 10252 r 9378 29.2 Common Permutation 10253 r 336 38.1 Series-Parallel Networks 10254 r 1401 38.4 The Priest Mathematician 10255 y 779 38.1 The knight's Tour 10256 r 1268 25.6 The Great Divide 10257 r 793 38.2 Dick and Jane 10258 r 5482 22.7 Contest Scoreboard 10259 r 1597 39.7 Hippity Hopscotch 10260 r 5672 52.3 Soundex 10261 y 3208 18.5 Ferry Loading 10262 r 696 30.2 Suffidromes 10263 r 773 37.6 Railway 10264 r 561 65.2 The Most Potent Corner 10265 y 518 24.3 Toroidal Chess Queens' Problem 10266 r 423 11.1 Surveying 10267 r 9321 13.9 Graphical Editor 10268 r 3865 20.1 498-bis 10269 r 688 40.7 Adventure of Super Mario 10270 y 333 33.3 Bigger Square Please... 10271 r 2690 44.9 Chopsticks 10272 r 362 18.8 DDR King 10273 r 916 21.1 Eat or Not to Eat? 10274 r 978 24.2 Fans and Gems 10275 r 705 34.0 Guess the Number! 10276 r 1811 75.9 Hanoi Tower Troubles Again! 10277 r 1145 24.5 Boastin' Red Socks 10278 r 3495 14.1 Fire Station 10279 r 2930 32.8 Mine Sweeper 10280 r 904 27.7 Old Wine Into New Bottles 10281 r 1887 46.0 Average Speed 10282 r 8706 31.8 Babelfish 10283 y 1550 51.5 The Kissing Circles 10284 r 749 50.3 Chessboard in FEN 10285 r 2473 53.1 Longest Run on a Snowboard 10286 y 2426 61.3 Trouble with a Pentagon 10287 y 1065 59.9 Gifts in a Hexagonal Box 10288 r 639 43.3 Coupons 10289 y 707 62.8 A Square and Equilateral Triangles 10290 r 4393 18.3 {Sum+=i++} to Reach N 10291 r 415 46.7 Cut the Legs 10292 r 263 44.1 The Gossiping System 10293 r 1679 52.0 Word Length and Frequency 10294 r 282 50.4 Arif in Dhaka (First Love Part 2) 10295 r 2442 55.0 Hay Points 10296 r 1403 37.0 Jogging Trails 10297 r 1840 65.1 Beavergnaw 10298 r 3609 33.8 Power Strings 10299 r 5071 26.4 Relatives 10300 r 6678 74.0 Ecological Premium 10301 r 3788 21.1 Rings and Glue 10302 r 7254 42.0 Summation of Polynomials 10303 r 2945 31.2 How Many Trees? 10304 r 2224 41.5 Optimal Binary Search Tree 10305 y 3466 49.7 Ordering Tasks 10306 r 1203 48.9 e-Coins 10307 r 1485 40.9 Killing Aliens in Borg Maze 10308 r 2053 26.6 Roads in the North 10309 r 923 58.7 Turn the Lights Off 10310 r 6813 28.2 Dog and Gopher 10311 r 8593 19.0 Goldbach and Euler 10312 r 931 44.4 Expression Bracketing 10313 r 2040 25.5 Pay the Price 10314 r 3926 1.7 Three Pigs 10315 r 3361 21.0 Poker Hands 10316 r 1553 19.8 Airline Hub 10317 y 1286 26.6 Equating Equations 10318 y 908 31.9 Security Panel 10319 r 783 27.3 Manhattan 10320 y 794 34.8 Cow Trouble! Help Please!! 10321 r 789 16.1 Polygon Intersection 10322 y 422 16.4 The Four in One Stadium 10323 r 11312 23.4 Factorial! You Must be Kidding!!! 10324 r 12890 25.2 Zeros and Ones 10325 r 1729 29.3 The Lottery 10326 r 2045 35.0 The Polynomial Equation 10327 r 8288 44.8 Flip Sort 10328 r 964 37.1 Coin Toss 10329 r 1013 25.5 Combinatorial Expression 10330 r 2511 32.3 Power Transmission 10331 r 1127 26.7 The Flyover Construction 10332 r 459 27.2 The Absent Minded Professor 10333 r 736 59.6 The Tower of ASCII 10334 r 3606 49.2 Ray Through Glasses 10335 r 961 15.3 Ray Inside a Polygon 10336 r 2217 62.9 Rank the Languages 10337 r 857 67.0 Flight Planner 10338 r 5624 41.8 Mischievous Children 10339 r 1102 25.5 Watching Watches 10340 r 15531 25.1 All in All 10341 r 4084 24.2 Solve It 10342 r 2073 14.6 Always Late 10343 r 1010 23.8 Base64 Decoding 10344 r 3156 25.0 23 out of 5 10345 y 527 37.8 Cricket/Football Goes Down 10346 r 7572 43.0 Peter's Smoke 10347 r 4082 27.5 Medians 10348 r 557 34.6 Submarines 10349 r 775 34.5 Antenna Placement 10350 r 731 52.8 Liftless EME 10351 r 626 50.0 Cutting Diamonds 10352 r 1509 18.9 Count the eWords 10353 y 427 36.5 Circles in Hexagon :-) 10354 r 2873 22.1 Avoiding Your Boss 10355 r 720 24.2 Superman 10356 r 1776 34.0 Rough Roads 10357 r 463 52.3 Playball !!! 10358 r 674 15.7 Matrix 10359 r 1621 55.8 Tiling 10360 r 3072 39.8 Rat Attack 10361 r 2285 59.6 Automatic Poetry 10362 r 814 13.0 Trains 10363 r 2335 33.3 Tic Tac Toe 10364 r 4165 22.3 Square 10365 r 1924 53.4 Blocks 10366 r 846 25.7 Faucet Flow 10367 r 692 26.3 Equations 10368 r 1673 39.2 Euclid's Game 10369 r 2729 31.0 Arctic Network 10370 r 8074 52.7 Above Average 10371 r 2094 29.2 Time Zones 10372 y 299 54.8 Leaps Tall Buildings (in a single bound) 10373 r 778 35.3 The Brick Stops Here 10374 r 1598 43.0 Election 10375 r 1833 38.2 Choose and divide 10376 r 437 34.8 Snakes 10377 r 1745 60.1 Maze Traversal 10378 r 2021 17.6 Complex Numbers 10379 y 200 40.0 Pit Stop Strategy 10380 y 733 17.5 Shogi Tournament 10381 r 589 36.5 The Rock 10382 r 2248 17.9 Watering Grass 10383 r 65 15.4 Queen vs Rook 10384 y 906 24.5 The Wall Pushers 10385 r 1339 23.2 Duathlon 10386 y 620 46.8 Circles in Triangle 10387 r 613 59.9 Billiard 10388 r 481 34.1 Snap 10389 r 2152 26.3 Subway 10390 r 658 36.0 Bean Counting 10391 r 2247 28.1 Compound Words 10392 r 1769 55.1 Factoring Large Numbers 10393 r 2227 30.0 The One-Handed Typist 10394 r 6323 33.3 Twin Primes 10395 r 307 32.6 Titans in Danger 10396 r 903 38.2 Vampire Numbers 10397 r 4772 24.1 Connect the Campus 10398 r 673 28.1 The Golden Pentagon 10399 r 313 41.9 Optimus Prime 10400 y 4581 27.8 Game Show Math 10401 r 1177 39.0 Injured Queen Problem 10402 y 474 11.2 Triangle Covering 10403 r 474 20.3 Escape from Tut's Tomb 10404 r 2538 49.9 Bachet's Game 10405 r 9380 36.9 Longest Common Subsequence 10406 r 782 42.3 Cutting tabletops 10407 r 3273 40.1 Simple division 10408 r 2059 56.1 Farey sequences 10409 r 3352 59.7 Die Game 10410 y 1538 26.5 Tree Reconstruction 10411 y 423 19.9 Another Game of Tetris 10412 r 1028 17.2 Big Big Trees 10413 r 990 23.2 Crazy Savages 10414 y 252 15.9 Denki Blocks 10415 r 1803 57.7 Eb Alto Saxophone Player 10416 r 829 40.7 Folding My T-Shirt 10417 r 537 34.6 Gift Exchanging 10418 r 607 30.8 Hyper Toy Soldiers 10419 r 2128 24.4 Sum-up the Primes 10420 r 2908 55.6 List of Conquests 10421 r 1007 30.5 Critical Wave 10422 r 2148 41.7 Knights in FEN 10423 r 619 38.3 Peter Takes a Tramway 10424 r 7353 36.8 Love Calculator 10425 r 1247 21.0 Mobile Destroyer 10426 r 920 29.1 Knights' Nightmare 10427 r 2144 51.5 Naughty Sleepy Boys 10428 r 1407 30.8 The Roots 10429 r 126 56.3 Mohr's Circle 10430 r 540 33.5 Dear GOD, Pardon Me 10431 r 378 28.0 Normal Distribution 10432 r 5971 40.3 Polygon Inside A Circle 10433 r 2436 14.7 Automorphic Numbers 10434 r 202 51.0 Working With Specific Gravity 10435 r 373 12.6 Compare Directories 10436 r 892 35.5 Cheapest way 10437 r 607 16.6 Playing With Fraction 10438 r 563 14.4 Meta Editor 10439 r 781 41.0 Temple of Dune 10440 r 824 48.8 Ferry Loading II 10441 r 1451 17.9 Catenyms 10442 r 962 18.4 Basic 10443 r 1884 63.2 Rock, Scissors, Paper 10444 r 498 48.8 Multi-peg Towers of Hanoi 10445 r 1386 16.8 Make Polygon 10446 r 1847 32.0 The Marriage Interview :-) 10447 r 1215 9.6 Sum-up the Primes (II) 10448 r 627 31.3 Unique World 10449 r 2353 14.6 Traffic 10450 r 4018 50.5 World Cup Noise 10451 r 1879 60.1 Ancient Village Sports 10452 r 1848 64.4 Marcus, help! 10453 y 1688 27.8 Make Palindrome 10454 r 908 23.9 Trexpression 10455 r 231 32.9 Gray Code 10456 r 565 16.8 Intelligent Cats 10457 r 1357 17.9 Magic Car 10458 r 591 21.2 Cricket Ranking 10459 r 1628 19.2 The Tree Root 10460 r 976 51.3 Find the Permuted String 10461 r 648 34.9 Difference 10462 r 929 24.1 Is There A Second Way Left? 10463 r 899 22.0 Aztec Knights 10464 r 644 32.8 Big Big Real Numbers 10465 r 4080 32.8 Homer Simpson 10466 r 1775 27.2 How Far? 10467 r 164 47.0 Parse Tree 10468 y 522 37.0 Rigid Circle Packing 10469 r 4610 71.0 To Carry or not to Carry 10470 r 248 31.0 Shifted Coefficient Number System 10471 y 332 67.5 Can't be too GREEDY 10472 r 329 26.4 Fastest Vs Cheapest 10473 r 5243 50.4 Simple Base Conversion 10474 r 4132 39.1 Where is the Marble? 10475 r 1026 27.3 Help the Leaders 10476 r 535 27.5 Spam or Not Spam 10477 r 1154 31.8 The Hybrid Knight 10478 r 347 16.7 The Falling Pillars 10479 r 675 33.0 The Hendrie Sequence 10480 y 824 39.0 Sabotage 10481 y 315 59.0 The Gift Wrappers of Hollywood 10482 r 2138 38.6 The Candyman Can 10483 r 717 40.6 The Sum Equals the Product 10484 r 1923 28.7 Divisibility of Factors 10485 r 146 15.8 Painting with CSE 10486 r 278 59.4 Mountain Village 10487 r 3301 40.0 Closest Sums 10488 r 460 45.9 Swimming Gopher 10489 r 2263 46.7 Boxes of Chocolates 10490 r 2043 43.6 Mr. Azad and his Son!!!!! 10491 r 1412 70.1 Cows and Cars 10492 y 251 5.2 Optimal Mastermind Strategy 10493 r 1357 41.2 Cats, with or without Hats 10494 r 2842 27.0 If We Were a Child Again 10495 r 516 52.1 Conic Distance 10496 r 1329 57.3 Collecting Beepers 10497 r 1215 43.3 Sweet Child Makes Trouble 10498 r 536 21.1 Happiness 10499 r 4984 36.5 The Land of Justice 10500 r 2468 32.1 Robot maps 10501 y 433 28.9 Simplified Shisen-Sho 10502 r 1814 60.2 Counting Rectangles 10503 r 871 54.9 The dominoes solitaire 10504 r 1127 56.3 Hidden squares 10505 r 1157 27.3 Montesco vs Capuleto 10506 y 532 60.0 The Ouroboros problem 10507 r 1571 37.4 Waking up brain 10508 r 3981 32.7 Word Morphing 10509 y 2417 56.4 R U Kidding Mr. Feynman! 10510 r 2554 24.0 Cactus 10511 y 1566 13.2 Councilling 10512 r 2488 10.2 A Day in Math-land 10513 r 977 9.6 Bangladesh Sequences 10514 r 638 32.1 River Crossing 10515 r 9322 31.2 Powers Et Al. 10516 r 489 42.3 Another Counting Problem 10517 r 796 39.1 Wind of Change! 10518 r 1690 38.2 How Many Calls? 10519 r 2065 30.7 !! Really Strange !! 10520 r 777 47.7 Determine it 10521 r 741 13.9 Continuously Growing Fractions 10522 r 1277 35.1 Height to Area 10523 r 3794 19.9 Very Easy !!! 10524 r 862 18.4 Matrix Reloaded 10525 r 1853 13.1 New to Bangladesh? 10526 r 489 22.3 Intellectual Property 10527 r 1016 51.0 Persistent Numbers 10528 r 807 66.9 Major Scales 10529 r 398 65.3 Dumb Bones 10530 r 5739 38.9 Guessing Game 10531 y 394 22.1 Maze Statistics 10532 r 1173 31.7 Combination! Once Again 10533 r 6898 33.6 Digit Primes 10534 r 2764 37.7 Wavio Sequence 10535 r 1614 20.4 Shooter 10536 r 1019 52.5 Game of Euler 10537 r 2108 13.6 The Toll! Revisited 10538 r 291 33.7 Powerful Magic Squares 10539 r 3870 29.4 Almost Prime Numbers 10540 y 524 54.2 Flowers of a Beautiful Mind 10541 r 1111 43.6 Stripe 10542 r 650 29.1 Hyper-drive 10543 r 1436 31.0 Traveling Politician 10544 r 782 27.1 Numbering the Paths 10545 y 696 35.9 Maximal Quadrilateral 10546 r 401 31.2 The Eagle's Nest 10547 r 615 47.2 Hidden Truth in Recurrence 10548 r 798 23.2 Find the Right Changes 10549 y 1071 24.6 Russian Dolls 10550 r 3630 57.6 Combination Lock 10551 r 1213 50.0 Basic Remains 10552 r 468 38.0 Genealogical Research 10553 r 581 34.1 Treasure Map 10554 r 680 62.2 Calories from Fat 10555 r 928 33.1 Dead Fraction 10556 r 537 37.4 Biometrics 10557 r 1376 26.1 XYZZY 10558 y 407 34.6 A Brief Gerrymander 10559 r 1479 23.7 Blocks 10560 r 722 34.6 Minimum Weight 10561 r 430 36.7 Treblecross 10562 r 897 28.1 Undraw the Trees 10563 r 712 32.2 Least Squares 10564 r 1355 27.1 Paths through the Hourglass 10565 y 137 38.0 Matrix 10566 r 1421 41.9 Crossed Ladders 10567 r 1442 26.2 Helping Fill Bates 10568 r 655 25.2 n Group k 10569 y 663 51.9 Number Theory 10570 r 737 36.4 Meeting with Aliens 10571 y 536 28.2 Products 10572 y 255 25.9 Black & White 10573 r 2485 45.9 Geometry Paradox 10574 r 2167 25.7 Counting Rectangles 10575 r 719 53.3 Polylops 10576 r 825 53.2 Y2K Accounting Bug 10577 r 427 55.3 Bounding box 10578 r 788 53.8 The Game of 31 10579 r 3670 59.4 Fibonacci Numbers 10580 y 379 23.2 Ransom Note 10581 r 591 30.8 Partitioning for fun and profit 10582 r 440 39.3 ASCII Labyrinth 10583 r 2970 41.2 Ubiquitous Religions 10584 r 342 12.6 Text Formalization 10585 r 1046 41.8 Center of symmetry 10586 r 816 56.4 Polynomial Remains 10587 r 974 26.9 Mayor's posters 10588 r 183 33.9 Queuing at the doctors 10589 r 2026 38.9 Area 10590 r 759 26.1 Boxes of Chocolates Again 10591 r 4274 48.3 Happy Number 10592 r 577 39.3 Freedom Fighter 10593 r 1188 48.6 Kites 10594 r 1444 13.6 Data Flow 10595 r 366 38.0 Knight on the Bee Board 10596 r 1810 39.1 Morning Walk 10597 r 367 47.1 Right Words 10598 r 358 61.2 Find the Latitude 10599 y 665 24.1 Robots(II) 10600 r 2404 33.3 ACM Contest and Blackout 10601 r 262 54.6 Cubes 10602 y 1379 40.2 Editor Nottobad 10603 r 696 63.9 Fill 10604 r 1427 22.7 Chemical Reaction 10605 r 341 13.5 Mines For Diamonds 10606 r 1237 23.9 Opening Doors 10607 r 796 12.8 Siege 10608 r 4251 41.6 Friends 10609 y 900 32.0 Fractal 10610 r 1435 32.4 Gopher and Hawks 10611 r 4243 38.9 The Playboy Chimp 10612 r 157 39.5 Paper Folding 10613 r 417 23.5 Mushroom Misery 10614 r 472 20.1 Dreadful Vectors 10615 y 699 20.6 Rooks 10616 r 1223 34.4 Divisible Group Sums 10617 r 1241 42.6 Again Palindrome 10618 y 479 25.1 Tango Tango Insurrection 10619 r 669 33.2 Advanced Causal Measurements 10620 r 1821 42.3 A Flea on a Chessboard 10621 y 685 23.5 Jack and Jill 10622 r 6796 22.0 Perfect P-th Powers 10623 r 626 30.7 Thinking Backward 10624 r 594 34.2 Super Number 10625 r 1301 37.9 GNU = GNU'sNotUnix 10626 r 1403 25.1 Buying Coke 10627 r 983 15.3 Infinite Race 10628 r 96 39.6 Quadrills 10629 r 359 18.4 Truckin' 10630 y 41 22.0 Millennium Ceremony 10631 y 752 25.0 Normals 10632 y 244 28.3 Pyramid 10633 r 2686 42.2 Rare Easy Problem 10634 r 792 38.5 Say NO to Memorization 10635 r 1176 34.2 Prince and Princess 10636 r 339 7.4 Stretching Geometry 10637 r 1037 53.0 Coprimes 10638 r 372 17.5 The Trip II 10639 r 88 19.3 Square Puzzle 10640 r 217 40.6 Planes around the World 10641 r 253 25.3 Barisal Stadium 10642 r 1936 62.5 Can You Solve It? 10643 r 279 56.6 Facing Problem With Trees 10644 r 714 23.4 Floor Tiles 10645 y 379 34.8 Menu 10646 r 608 72.9 What is the Card? 10647 r 384 33.1 Optimal House Placement 10648 r 354 59.3 Chocolate Box 10649 r 631 29.3 Danger Point 10650 r 2272 24.8 Determinate Prime 10651 r 747 74.7 Pebble Solitaire 10652 r 359 44.3 Board Wrapping 10653 r 2257 31.7 Bombs! NO they are Mines!! 10654 r 265 51.7 The Uxuhul Voting System 10655 r 2217 12.4 Contemplation - Algebra 10656 r 2696 44.4 Maximum Sum (II) 10657 r 122 20.5 Prince Frog II 10658 r 287 59.6 ReArrange 10659 r 527 34.2 Fitting Text into Slides 10660 r 365 66.6 Citizen attention offices 10661 r 614 21.7 The Perspectographer 10662 r 545 72.1 The Wedding 10663 r 1159 29.7 Non-Powerful Subsets 10664 r 1327 56.8 Luggage 10665 r 260 53.1 Diatribe against Pigeonholes 10666 r 535 57.4 The Eurocup is Here! 10667 r 902 60.4 Largest Block 10668 r 1722 17.8 Expanding Rods 10669 r 1018 50.8 Three powers 10670 r 866 41.9 Work Reduction 10671 r 261 23.0 Grid Speed 10672 r 679 57.0 Marbles on a tree 10673 y 2145 43.3 Play with Floor and Ceil 10674 y 353 24.6 Tangents 10675 r 256 16.0 Revenge of Faucet Flow 10676 r 245 22.0 Grid Points 10677 r 576 74.0 Base Equality 10678 r 1313 75.1 The Grazing Cow 10679 r 4921 14.3 I Love Strings!! 10680 r 2203 38.5 LCM 10681 r 902 37.4 Teobaldo's Trip 10682 r 504 25.0 Forró Party 10683 r 1063 56.9 The decadary watch 10684 r 2367 49.1 The jackpot 10685 r 1110 31.1 Nature 10686 r 800 19.0 SQF Problems 10687 r 348 58.6 Monitoring the Amazon 10688 r 704 48.6 The Poor Giant 10689 r 1627 38.0 Yet another Number Sequence 10690 r 1462 23.3 Expression Again 10691 r 313 12.8 Subway 10692 r 749 21.1 Huge Mods 10693 y 805 75.2 Traffic Volume 10694 r 611 38.0 Combinatorial Summation 10695 y 444 24.3 Find the Point 10696 r 8350 59.6 f91 10697 y 1029 16.2 Firemen barracks 10698 r 1025 27.3 Football Sort 10699 r 3432 62.8 Count the factors 10700 r 3559 36.6 Camel trading 10701 r 2156 57.5 Pre, in and post 10702 r 2128 52.3 Travelling Salesman 10703 r 1852 61.5 Free spots 10704 r 297 39.4 Traffic! 10705 r 1612 39.6 The Fun Number System 10706 r 2101 36.1 Number Sequence 10707 r 546 29.5 2D-Nim 10708 y 663 22.2 Cheetah 10709 y 1022 20.8 Intersection is Not that Easy 10710 r 698 43.3 Chinese Shuffle 10711 y 147 53.7 Stitching 10712 r 538 12.8 Count the Numbers 10713 y 898 24.5 Map 10714 r 2183 58.6 Ants 10715 y 835 30.5 Cat 10716 r 672 47.6 Evil Straw Warts Live 10717 r 1088 44.7 Mint 10718 r 989 41.6 Bit Mask 10719 r 1740 50.1 Quotient Polynomial 10720 r 1475 27.1 Graph Construction 10721 r 1056 44.1 Bar Codes 10722 r 1203 25.6 Super Lucky Numbers 10723 r 355 37.7 Cyborg Genes 10724 r 793 22.2 Road Construction 10725 y 2530 7.4 Triangular Square 10726 r 431 30.6 Coco Monkey 10727 r 201 48.8 Practice 10728 y 595 32.6 Help! 10729 r 471 15.9 Treequivalence 10730 r 1678 44.0 Antiarithmetic? 10731 r 387 60.5 Test 10732 r 588 34.7 The Strange Research 10733 r 462 61.9 The Colored Cubes 10734 r 289 71.3 Triangle Partitioning 10735 y 954 16.6 Euler Circuit 10736 r 244 53.7 Series of PI 10737 r 286 11.5 The Difference Engine 10738 r 1958 58.0 Riemann vs Mertens 10739 r 950 62.0 String to Palindrome 10740 r 934 26.6 Not the Best 10741 r 539 78.5 Magic Cube 10742 r 771 58.8 The New Rule in Euphomia 10743 r 233 38.6 Blocks on Blocks 10744 r 1235 26.7 The Optimal Super-Highway 10745 r 2250 39.2 Dominant Strings 10746 r 1007 29.0 Crime Wave - The Sequel 10747 r 829 16.8 Maximum Subsequence 10748 r 979 22.9 Knights Roaming 10749 y 321 18.7 Automobile Travelling 10750 y 803 34.9 Beautiful Points 10751 y 247 43.7 Chessboard 10752 y 229 28.8 Distant Jumping 10753 y 341 19.4 Exponential Function 10754 r 455 28.8 Fantastic Sequence 10755 r 533 25.3 Garbage Heap 10756 y 185 18.9 HardNumbers 10757 r 565 0.4 Interpreting SQL 10758 y 109 35.8 Journey 10759 r 471 56.3 Dice Throwing 10760 r 309 24.9 Translation or rotation 10761 r 463 46.7 Broken Keyboard 10762 r 80 17.5 Treasure Castle 10763 r 1840 44.6 Foreign Exchange 10764 y 274 50.0 Signed-digit numbers 10765 r 396 45.5 Doves and bombs 10766 r 263 31.6 Organising the Organisation 10767 r 181 45.9 Barcelona's trams 10768 r 269 34.2 Planarity 10769 r 620 39.2 Pillars 10770 r 387 19.1 Sokoban 10771 r 936 46.5 Barbarian tribes 10772 r 245 57.1 Rose windows 10773 r 1477 32.5 Back to Intermediate Math 10774 r 651 76.0 Repeated Josephus 10775 y 166 52.4 Mystical Matrix 10776 r 883 46.8 Determine The Combination 10777 r 410 55.4 God! Save me 10778 r 136 8.8 Mathemagicland 10779 r 171 38.6 Collectors Problem 10780 r 1849 33.9 Again Prime? No Time. 10781 y 9 11.1 Global Positioning System 10782 r 519 37.2 Send More Money 10783 r 5780 58.5 Odd Sum 10784 r 2613 38.5 Diagonal 10785 r 625 48.0 The Mad Numerologist 10786 r 113 64.6 Qualify for the Champions League 10787 r 479 67.0 Modular Equations 10788 r 368 31.5 Parenthesizing Palindromes 10789 r 3194 52.9 Prime Frequency 10790 r 1446 51.0 How Many Points of Intersection? 10791 r 2421 22.0 Minimum Sum LCM 10792 r 570 53.3 The Laurel-Hardy Story 10793 r 673 40.3 The Orc Attack 10794 r 390 27.2 The Deadly Olympic Returns!!! 10795 r 283 35.0 A Different Task 10796 r 408 18.6 Right Hand Rule 10797 r 294 31.0 Peaceful Sharing 10798 r 501 26.5 Be wary of Roses 10799 r 324 48.1 OOPS! They did it Again... 10800 r 3618 33.2 Not That Kind of Graph 10801 r 1445 36.2 Lift Hopping 10802 r 1102 26.2 Lex Smallest Drive 10803 r 1935 40.8 Thunder Mountain 10804 r 1484 25.5 Gopher Strategy 10805 r 591 34.9 Cockroach Escape Networks 10806 r 1184 35.1 Dijkstra, Dijkstra. 10807 r 1383 17.1 Prim, Prim. 10808 r 435 11.0 Rational Resistors 10809 r 282 23.4 Great Circle 10810 r 2669 34.0 Ultra-QuickSort 10811 r 305 48.9 Up the Ante 10812 r 5171 42.5 Beat the Spread! 10813 r 1163 49.0 Traditional BINGO 10814 r 1040 27.6 Simplifying Fractions 10815 r 3237 33.3 Andy's First Dictionary 10816 y 2208 19.7 Travel in Desert 10817 r 600 27.0 Headmaster's Headache 10818 r 615 22.4 Dora Trip 10819 r 1865 16.7 Trouble of 13-Dots 10820 r 1555 51.9 Send a Table 10821 r 808 49.5 Constructing BST 10822 r 532 39.1 Planet of the Rock, Paper and Scissors 10823 r 1028 37.0 Of Circles and Squares 10824 r 642 26.0 Regular Polygon 10825 r 259 55.2 Anagram and Multiplication 10826 r 355 29.0 Hot or Cold? 10827 r 1290 31.2 Maximum sum on a torus 10828 r 524 15.1 Back to Kernighan-Ritchie 10829 r 395 18.5 L-Gap Substrings 10830 r 840 50.6 A New Function 10831 r 708 32.8 Gerg's Cake 10832 r 348 48.9 Yoyodyne 10833 r 149 40.9 Lunar Forest 10834 r 269 26.0 The Story of Two Coins 10835 r 423 37.1 Playing with Coins 10836 r 280 34.3 The Maximum Term 10837 r 462 25.5 A Research Problem 10838 r 319 45.8 The Pawn Chess 10839 r 236 44.1 The Curse of Barbosa 10840 r 55 3.6 Multi-stage Compressor 10841 r 186 46.2 Lift Hopping in the Real World 10842 r 777 46.1 Traffic Flow 10843 r 482 46.7 Anne's game 10844 r 726 27.3 Bloques 10845 r 66 1.5 The crusades 10846 r 98 24.5 Reading time from a clock 10847 r 216 24.5 Basic Tautologies 10848 r 529 33.5 Make Palindrome Checker 10849 r 1345 46.5 Move the bishop 10850 r 423 34.8 The Gossipy Gossipers Gossip Gossips 10851 r 440 72.7 2D Hieroglyphs decoder 10852 r 992 71.0 Less Prime 10853 r 568 13.4 Pablito nailed a nail 10854 r 530 44.0 Number of Paths 10855 r 456 64.3 Rotated square 10856 r 1805 29.5 Recover Factorial 10857 r 175 8.0 Easter Eggs 10858 r 375 54.4 Unique Factorization 10859 r 311 21.5 Placing Lampposts 10860 r 658 35.9 Many a Little makes a Mickle 10861 r 46 37.0 Security by Ambiguity 10862 r 582 61.3 Connect the Cable Wires 10863 y 144 31.9 Shovelling Snow 10864 r 225 20.4 The Predator 10865 r 622 74.1 Brownie Points 10866 r 414 45.9 Magic Bitstrings 10867 r 257 20.6 Cutting a Polygon 10868 r 412 45.6 Bungee Jumping 10869 r 166 45.8 Brownie Points II 10870 r 450 46.9 Recurrences 10871 r 965 59.8 Anti-Primes 10872 r 473 39.1 Triangles 10873 r 158 50.6 Splat, Inc. 10874 r 558 51.6 Segments 10875 r 603 31.7 Big Math 10876 r 206 37.9 Factory Robot 10877 r 364 56.3 Diceoids 10878 r 1706 59.8 Decode the tape 10879 y 979 57.0 Code Refactoring 10880 r 1906 31.0 Colin and Ryan 10881 r 409 26.2 Piotr's Ants 10882 r 338 50.3 Koerner's Pub 10883 r 728 27.5 Supermean 10884 r 59 76.3 Persephone 10885 y 131 39.7 Martin the Gardener 10886 y 508 22.2 Standard Deviation 10887 r 2622 9.0 Concatenation of Languages 10888 r 571 30.8 Warehouse 10889 r 728 35.3 The Lost Gift 10890 r 1044 31.1 Maze 10891 r 706 54.2 Game of Sum 10892 r 947 42.7 LCM Cardinality 10893 y 764 25.4 Creating Sudoku Puzzles 10894 r 1019 49.8 Save Hridoy 10895 r 834 52.6 Matrix Transpose 10896 r 853 46.8 Known Plaintext Attack 10897 r 277 73.6 Travelling Distance 10898 r 725 44.0 Combo Deal 10899 r 251 29.5 Billiard again 10900 r 297 71.0 So you want to be a 2n-aire? 10901 r 778 33.8 Ferry Loading III 10902 r 1045 35.1 Pick-up Sticks 10903 r 2231 46.3 Rock-Paper-Scissors Tournament 10904 r 335 29.0 Structural Equivalence 10905 r 2293 36.6 Children's Game 10906 r 264 37.9 Strange Integration 10907 r 340 17.9 Art Gallery 10908 r 1016 51.3 Largest Square 10909 r 1004 28.1 Lucky Number 10910 r 1165 45.8 Marks Distribution 10911 r 900 44.8 Forming Quiz Teams 10912 r 1312 32.1 Simple Minded Hashing 10913 r 600 32.8 Walking on a Grid 10914 r 797 38.0 Abundance and Perfect Numbers 10915 r 422 58.3 War on Weather 10916 r 994 62.3 Factstone Benchmark 10917 r 904 32.5 Walk Through the Forest 10918 r 825 61.9 Tri Tiling 10919 r 912 69.7 Prerequisites? 10920 r 935 51.6 Spiral Tap 10921 r 2193 69.6 Find the Telephone 10922 r 2558 57.6 2 the 9s 10923 r 543 33.1 Seven Seas 10924 r 3937 41.4 Prime Words 10925 r 1292 36.7 Krakovia 10926 r 1456 37.8 How Many Dependencies? 10927 r 1061 22.5 Bright Lights 10928 r 1063 55.9 My Dear Neighbours 10929 r 4991 39.1 You can say 11 10930 r 2257 25.1 A-Sequence 10931 r 2278 69.0 Parity 10932 r 882 26.8 Calculator 10933 r 778 38.2 Volleyball 10934 r 629 31.3 Dropping water balloons 10935 r 1574 59.7 Throwing cards away I 10936 r 335 25.7 Land surveyor's job 10937 r 635 36.9 Blackbeard the Pirate 10938 r 746 36.6 Flea circus 10939 r 418 19.9 Ants, Aphids and a Ladybug 10940 r 2299 54.2 Throwing cards away II 10941 r 456 23.0 Words adjustment 10942 r 495 51.9 Can of Beans 10943 r 1280 49.5 How do you add? 10944 r 1279 28.7 Nuts for nuts.. 10945 r 1780 56.2 Mother bear 10946 r 1088 43.4 You want what filled? 10947 r 1095 52.4 Bear with me, again.. 10948 r 1711 47.3 The primary problem 10949 r 1130 11.6 Kids in a Grid 10950 r 723 31.0 Bad Code 10951 r 238 29.4 Polynomial GCD 10952 r 159 22.6 Pattern Transformations 10953 y 275 45.8 Stochastic Digit Generator 10954 r 2228 33.8 Add All 10955 r 94 27.7 Playfair Cipher 10956 r 559 46.5 Prime Suspect 10957 r 1507 49.3 So Doku Checker 10958 r 1161 32.9 How Many Solutions? 10959 r 806 53.6 The Party, Part I 10960 r 177 39.0 The Party, Part II 10961 r 122 25.4 Chasing After Don Giovanni 10962 r 234 32.9 Don Giovanni's Last Dinner 10963 r 393 56.2 The Swallowing Ground 10964 r 652 41.0 Strange Planet 10965 r 302 21.9 Khepel's Problem 10966 r 116 1.7 3KP-BASH Project 10967 r 241 17.4 The Great Escape 10968 r 288 32.3 KuPellaKeS 10969 r 176 26.7 Sweet Dream 10970 r 2078 64.8 Big Chocolate 10971 r 49 8.2 Building Construction 10972 r 161 14.3 RevolC FaeLoN 10973 r 1302 26.4 Triangle Counting 10974 r 58 8.6 The Ridiculous Game 10975 r 761 9.1 Dueue's Quiz 10976 r 971 56.3 Fractions Again?! 10977 r 829 32.4 Enchanted Forest 10978 r 493 66.9 Let's Play Magic! 10979 r 337 24.0 How Many Triangles? 10980 r 708 32.8 Lowest Price in Town 10981 r 455 22.6 String Morphing 10982 y 442 36.0 Troublemakers 10983 r 370 30.8 Buy one, get the rest free 10984 r 470 27.4 Double NP-hard 10985 r 289 45.0 Rings'n'Ropes 10986 r 1460 27.5 Sending email 10987 r 428 40.0 Antifloyd 10988 r 157 15.3 From G to H and back 10989 r 800 22.1 Bomb, Divide and Conquer 10990 r 413 53.3 Another New Function 10991 y 431 64.0 Region 10992 r 732 34.3 The Ghost of Programmers 10993 r 331 39.0 Ignoring Digits 10994 r 1082 32.9 Simple Addition 10995 r 114 58.8 Educational Journey 10996 r 79 59.5 Go 10997 r 217 38.7 Medals 10998 r 281 68.0 Flipping Colors 10999 r 818 34.0 Crabbles 11000 r 2536 40.5 Bee 11001 r 815 40.9 Necklace 11002 r 1216 23.5 Towards Zero 11003 r 998 28.3 Boxes 11004 r 347 51.6 Changing Roadmap 11005 r 1798 42.9 Cheapest Base 11006 y 164 20.7 Wheel Good 11007 r 294 24.5 Mini Cube 11008 r 1277 21.8 Antimatter Ray Clearcutting 11009 r 54 38.9 Geometry Once Again 11010 r 344 24.4 Tic-Tac-Tough 11011 r 415 39.3 Numerical Methods! A Satire 11012 r 688 46.9 Cosmic Cabbages 11013 y 303 30.7 Get Straight 11014 r 250 45.2 Make a Crystal 11015 r 979 46.1 05-2 Rendezvous 11016 r 183 30.6 Square Counting 11017 r 218 21.1 A Greener World 11018 y 184 29.9 Mars Buggy 11019 r 788 15.0 Matrix Matcher 11020 r 725 17.0 Efficient Solutions 11021 y 377 52.5 Tribles 11022 r 402 63.7 String Factoring 11023 r 202 10.4 Multisets and Sequences 11024 r 322 45.0 Circular Lock 11025 r 185 36.2 Mr. And Mrs. Hamilton 11026 r 862 45.4 A Grouping Problem 11027 r 535 39.4 Palindromic Permutation 11028 r 233 57.1 Sum of Product 11029 r 633 42.5 Leading and Trailing 11030 r 97 46.4 Predator II 11031 r 488 26.4 Looking for a Subset 11032 r 1059 25.9 Function Overloading 11033 r 215 39.1 Help my Brother 11034 r 324 56.8 Ferry Loading IV 11035 r 313 33.5 Card Hands 11036 r 325 52.0 Eventually Periodic Sequence 11037 r 44 40.9 Point of View in Flatland 11038 r 416 51.2 How Many O's? 11039 r 988 55.9 Building designing 11040 r 757 79.7 Add bricks in the wall 11041 r 149 12.1 Quarter-Finals with Brazil!? No!!! 11042 r 495 53.7 Complex, difficult and complicated 11043 r 287 32.1 Fast and Easy Data Compressor 11044 r 578 81.1 Searching for Nessy 11045 r 533 49.0 My T-shirt suits me 11046 r 302 45.4 Numbers and operations 11047 r 653 22.1 The Scrooge Co Problem 11048 r 612 38.9 Automatic Correction of Misspellings 11049 y 299 60.2 Basic wall maze 11050 y 116 25.0 Construct the wall maze 11051 y 352 41.5 Dihedral groups 11052 r 238 28.2 Economic phone calls 11053 r 568 47.5 Flavius Josephus Reloaded 11054 r 541 59.9 Wine trading in Gergovia 11055 r 746 53.6 Homogeneous squares 11056 r 812 39.7 Formula 1 11057 r 1033 46.3 Exact Sum 11058 r 517 51.1 Encoding 11059 r 1200 33.2 Maximum Product 11060 r 420 54.3 Beverages 11061 r 163 52.8 Playing War 11062 r 601 44.8 Andy's Second Dictionary 11063 r 1300 30.4 B2-Sequence 11064 r 507 59.0 Number Theory 11065 r 159 34.0 A Gentlemen's Agreement 11066 r 92 33.7 Aragorn 11067 r 616 48.9 Little Red Riding Hood 11068 y 378 68.8 An Easy Task 11069 r 370 78.4 A Graph Problem 11070 r 327 57.5 The Good Old Times 11071 r 136 41.9 Permutation Representation 11072 r 632 24.5 Points 11073 r 345 33.6 Euler's Totient Function