Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 5094 1135 22% 0.00 1216 918 75% 3.9
All Different Directions 661 298 45% 0.00 275 241 88% 2.6
Bag of Tiles 243 81 33% 0.20 62 39 63% 7.7
BASIC Interpreter 429 61 14% 0.01 73 45 62% 6.2
Bounding Robots 1153 698 61% 0.00 644 604 94% 1.6
Cellular Merging 28 4 14% 0.25 5 2 40% 7.4
Charting Progress 706 356 50% 0.00 319 287 90% 2.6
Chatter 105 32 30% 0.15 23 18 78% 6.0
Checking For Correctness 568 160 28% 0.01 149 120 81% 4.6
Connect the Dots 356 140 39% 0.00 115 101 88% 3.4
Convex Polygon Area 589 366 62% 0.00 329 309 94% 2.0
Counting Stars 2806 990 35% 0.00 872 745 85% 2.7
Dart Scoring 162 42 26% 0.01 54 38 70% 5.5
Deduplicating Files 1765 485 27% 0.01 473 349 74% 4.5
Detailed Differences 3231 1938 60% 0.00 1833 1770 97% 1.3
Different Distances 2318 1173 51% 0.00 1039 979 94% 1.5
Engineering English 2728 1206 44% 0.00 1168 974 83% 2.4
Enlarging Hash Tables 948 360 38% 0.00 284 235 83% 3.4
Erdős Numbers 459 136 30% 0.01 108 83 77% 5.0
Escape Plan 404 109 27% 0.01 92 73 79% 5.0
Estimating the Area of a Circle 2388 1550 65% 0.00 1469 1409 96% 1.4
Forest Fires 64 23 36% 0.18 24 18 75% 5.4
Functional Fun 1010 414 41% 0.00 334 319 96% 1.8
Fundamental Neighbors 623 245 39% 0.00 205 157 77% 5.0
Generalized Recursive Functions 237 97 41% 0.02 83 69 83% 4.1
Genetic Search 377 195 52% 0.00 186 167 90% 2.1
Golomb Rulers 410 220 54% 0.02 201 175 87% 3.2
Hall O' Wee Mirrors 131 60 46% 0.00 52 43 83% 5.0
Heliocentric 1056 658 62% 0.00 613 578 94% 1.7
Hitting the Targets 1129 659 58% 0.00 650 605 93% 1.7
How Many Digits? 3800 1100 29% 0.00 868 684 79% 3.6
Hurricane Danger! 225 65 29% 0.01 79 56 71% 5.8
Image Decoding 800 249 31% 0.00 251 208 83% 3.3
In Or Out 1287 419 33% 0.00 413 362 88% 3.0
Island Hopping 692 366 53% 0.02 243 209 86% 3.6
Juggling Patterns 155 48 31% 0.00 40 24 60% 8.0
Limited Correspondence 252 60 24% 0.05 52 35 67% 5.6
Loopy Cab Drivers 58 19 33% 0.01 15 14 93% 4.6
Loopy Transit 63 29 46% 0.00 33 28 85% 4.9
Managing Packaging 433 106 24% 0.01 139 73 53% 6.5
Matrix Inverse 1635 590 36% 0.00 567 476 84% 2.7
Maximizing (And Minimizing) Your Winnings 450 197 44% 0.12 131 114 87% 3.5
Maximizing Your Pay 92 27 29% 0.00 31 19 61% 6.7
Maze Movement 91 53 58% 0.06 48 40 83% 4.5
Metaprogramming 1586 609 38% 0.00 591 509 86% 2.5
Multi-Touch Gesture Classification 70 24 34% 0.00 20 17 85% 5.5
Musical Notation 603 294 49% 0.00 288 267 93% 2.1
Music Your Way 511 248 49% 0.00 221 198 90% 2.4
Name That Permutation 311 122 39% 0.00 119 96 81% 4.7
Notable Quotables 72 9 12% 0.00 17 8 47% 6.7
Oddities 12731 7216 57% 0.00 6498 6287 97% 1.3
Out of Context 22 4 18% 0.34 7 3 43% 7.7
Pachinko Probability 177 68 38% 0.00 63 54 86% 4.3
Pachyderm Peanut Packing 281 198 70% 0.00 169 162 96% 1.7
Page Layout 58 17 29% 0.02 19 15 79% 5.4
Parallel Analysis 72 28 39% 0.86 25 18 72% 6.4
Parsing Hex 1208 352 29% 0.00 368 313 85% 2.8
Permutation Encryption 2075 820 40% 0.00 831 724 87% 2.3
Polish Notation 268 90 34% 0.00 93 78 84% 3.2
Preludes 1034 580 56% 0.00 566 532 94% 1.7
Primal Representation 1137 276 24% 0.02 229 159 69% 6.4
Prime Reduction 878 314 36% 0.04 255 199 78% 4.1
Prime Spiral 262 112 43% 0.00 84 79 94% 2.7
Quick Estimates 4935 2777 56% 0.00 2636 2494 95% 1.4
Quite a Problem 2124 880 41% 0.00 839 768 92% 1.8
Race Day 154 72 47% 0.00 65 57 88% 4.0
Reachable Roads 860 408 47% 0.00 364 330 91% 2.2
Reversing Roads 624 181 29% 0.00 160 132 82% 4.6
Robot Protection 297 136 46% 0.02 81 72 89% 2.3
Saving Daylight 1291 721 56% 0.00 678 629 93% 1.7
Secure Doors 2426 1156 48% 0.00 1136 1033 91% 1.8
Self-Similar Strings 307 165 54% 0.02 121 105 87% 3.9
Selling Spatulas 452 45 10% 0.02 67 29 43% 7.5
Sierpiński Circumference 1556 603 39% 0.00 523 471 90% 2.4
Sneak Attack 162 8 5% 0.00 21 8 38% 8.8
Sort of Sorting 3828 1357 35% 0.01 1146 943 82% 2.4
Statistics 4068 1822 45% 0.00 1744 1602 92% 1.7
Stirling's Approximation 596 261 44% 0.00 113 92 81% 4.5
Structural Differences 36 12 33% 0.02 13 8 62% 5.5
Sudokunique 689 76 11% 0.01 86 35 41% 9.0
Support Vector Machine 753 192 25% 0.02 211 132 63% 5.9
Surveillance Squared 126 27 21% 0.02 36 23 64% 5.3
Synchronizing Lists 2148 1389 65% 0.00 1263 1196 95% 1.6
Texture Analysis 703 355 50% 0.00 308 275 89% 2.5
The Rectangles Are Surrounding Us! 305 150 49% 0.00 141 118 84% 3.4
Transportation Planning 97 32 33% 0.05 26 25 96% 4.0
Unicycle Counting 99 29 29% 0.00 37 25 68% 5.9
Variable Arithmetic 515 220 43% 0.00 228 202 89% 2.6
Volume Amplification 103 36 35% 0.33 33 24 73% 5.9
Where to Live? 462 152 33% 0.01 125 98 78% 4.2