Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 6196 1434 23% 0.00 1455 1117 77% 3.6
All Different Directions 769 344 45% 0.00 318 278 87% 2.6
Bag of Tiles 335 104 31% 0.20 89 59 66% 6.9
BASIC Interpreter 530 75 14% 0.01 88 54 61% 7.3
Bounding Robots 1498 895 60% 0.00 828 782 94% 1.6
Cellular Merging 30 4 13% 0.25 6 2 33% 8.2
Charting Progress 739 383 52% 0.00 344 312 91% 2.6
Chatter 106 33 31% 0.15 24 19 79% 6.0
Checking For Correctness 614 179 29% 0.01 167 134 80% 4.7
Connect the Dots 504 205 41% 0.00 171 151 88% 3.1
Convex Polygon Area 805 495 61% 0.00 458 427 93% 2.0
Counting Stars 3710 1220 33% 0.00 1093 923 84% 3.1
Dart Scoring 203 58 29% 0.01 64 47 73% 5.8
Das Blinkenlights 2983 1243 42% 0.00 1228 1134 92% 1.9
Deduplicating Files 1968 563 29% 0.01 523 394 75% 4.3
Detailed Differences 4041 2382 59% 0.00 2259 2178 96% 1.3
Different Distances 2832 1425 50% 0.00 1276 1201 94% 1.5
Engineering English 3332 1442 43% 0.00 1397 1163 83% 2.3
Enlarging Hash Tables 1098 407 37% 0.00 327 269 82% 3.6
Erdős Numbers 527 155 29% 0.01 130 99 76% 4.8
Escape Plan 438 119 27% 0.01 104 80 77% 6.0
Estimating the Area of a Circle 2660 1743 66% 0.00 1665 1591 96% 1.5
Forest Fires 97 34 35% 0.18 31 24 77% 4.7
Functional Fun 1090 454 42% 0.00 375 353 94% 2.0
Fundamental Neighbors 715 276 39% 0.00 235 183 78% 4.7
Generalized Recursive Functions 255 112 44% 0.02 96 82 85% 3.5
Genetic Search 405 210 52% 0.00 201 179 89% 2.2
Golomb Rulers 451 245 54% 0.02 227 199 88% 3.3
Hall O' Wee Mirrors 132 61 46% 0.00 53 44 83% 5.0
Heliocentric 1405 814 58% 0.00 770 719 93% 1.8
Hitting the Targets 1521 872 57% 0.00 849 786 93% 1.7
How Many Digits? 4404 1216 28% 0.00 1003 780 78% 4.0
Hurricane Danger! 266 75 28% 0.01 90 65 72% 4.9
Image Decoding 842 264 31% 0.00 264 221 84% 3.2
In Or Out 1451 483 33% 0.00 482 423 88% 2.9
Island Hopping 755 390 52% 0.02 264 228 86% 3.6
Juggling Patterns 171 51 30% 0.00 42 26 62% 7.9
Limited Correspondence 490 149 30% 0.03 62 42 68% 5.1
Loopy Cab Drivers 68 23 34% 0.01 19 18 95% 4.5
Loopy Transit 65 31 48% 0.00 35 30 86% 5.1
Managing Packaging 435 107 25% 0.01 140 74 53% 6.6
Matrix Inverse 1906 649 34% 0.00 648 529 82% 3.5
Maximizing (And Minimizing) Your Winnings 482 212 44% 0.12 145 127 88% 3.5
Maximizing Your Pay 106 35 33% 0.00 39 26 67% 5.8
Maze Movement 119 70 59% 0.06 62 51 82% 5.1
Metaprogramming 1706 661 39% 0.00 646 558 86% 2.6
Multi-Touch Gesture Classification 105 26 25% 0.00 23 19 83% 5.8
Musical Notation 630 307 49% 0.00 299 278 93% 2.1
Music Your Way 591 283 48% 0.00 259 233 90% 2.4
Name That Permutation 351 134 38% 0.00 131 107 82% 4.5
Notable Quotables 74 10 14% 0.00 19 9 47% 7.4
Oddities 15005 8480 57% 0.00 7628 7367 97% 1.3
Out of Context 25 7 28% 0.07 10 6 60% 7.0
Pachinko Probability 222 89 40% 0.00 85 72 85% 4.6
Pachyderm Peanut Packing 333 233 70% 0.00 207 197 95% 1.8
Page Layout 110 27 25% 0.02 28 21 75% 5.9
Parallel Analysis 131 53 40% 0.65 48 38 79% 4.1
Parsing Hex 1392 405 29% 0.00 425 360 85% 3.0
Permutation Encryption 2480 956 39% 0.00 974 844 87% 2.5
Polish Notation 332 106 32% 0.00 109 91 83% 3.5
Preludes 1286 693 54% 0.00 675 632 94% 1.8
Primal Representation 1169 287 25% 0.02 240 169 70% 6.4
Prime Reduction 1234 458 37% 0.04 324 251 77% 4.2
Prime Spiral 329 144 44% 0.00 104 92 88% 4.3
Quick Estimates 5725 3244 57% 0.00 3082 2917 95% 1.5
Quite a Problem 2323 968 42% 0.00 919 846 92% 1.8
Race Day 160 75 47% 0.00 66 58 88% 4.1
Reachable Roads 1067 513 48% 0.00 464 415 89% 2.4
Reversing Roads 749 191 26% 0.00 186 140 75% 5.6
Robot Protection 340 161 47% 0.02 102 92 90% 2.3
Saving Daylight 1485 815 55% 0.00 781 722 92% 1.8
Secure Doors 3006 1429 48% 0.00 1404 1281 91% 1.7
Self-Similar Strings 379 194 51% 0.02 149 128 86% 3.6
Selling Spatulas 485 49 10% 0.02 76 33 43% 8.4
Sierpiński Circumference 1870 705 38% 0.00 616 556 90% 2.4
Sneak Attack 225 13 6% 0.00 28 11 39% 9.1
Sort of Sorting 4298 1549 36% 0.01 1314 1084 82% 2.5
Statistics 4656 2051 44% 0.00 1952 1792 92% 1.8
Stirling's Approximation 629 269 43% 0.00 120 98 82% 4.8
Structural Differences 36 12 33% 0.02 13 8 62% 5.5
Substring Switcheroo 129 38 29% 0.69 45 32 71% 6.6
Sudokunique 735 83 11% 0.01 99 41 41% 8.7
Support Vector Machine 764 199 26% 0.02 216 138 64% 5.7
Surveillance Squared 128 29 23% 0.02 38 25 66% 5.4
Synchronizing Lists 2680 1645 61% 0.00 1491 1402 94% 1.7
Texture Analysis 915 461 50% 0.00 409 363 89% 2.4
The Rectangles Are Surrounding Us! 364 182 50% 0.00 165 137 83% 3.8
Transportation Planning 125 41 33% 0.05 34 32 94% 4.0
Unicycle Counting 131 35 27% 0.00 46 30 65% 6.1
Variable Arithmetic 652 256 39% 0.00 269 237 88% 2.7
Volume Amplification 138 46 33% 0.33 41 31 76% 5.6
Where to Live? 488 164 34% 0.01 136 108 79% 4.5