Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 6804 1568 23% 0.00 1594 1215 76% 4.2
All Different Directions 840 376 45% 0.00 339 296 87% 2.6
Bag of Tiles 338 106 31% 0.20 91 61 67% 6.6
BASIC Interpreter 759 129 17% 0.01 122 78 64% 7.1
Bounding Robots 1561 938 60% 0.00 873 825 95% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 1655 731 44% 0.00 576 537 93% 2.1
Chatter 107 34 32% 0.15 25 20 80% 6.0
Checking For Correctness 648 185 29% 0.01 173 139 80% 4.7
Connect the Dots 591 225 38% 0.00 191 165 86% 3.6
Convex Polygon Area 938 561 60% 0.00 521 489 94% 1.9
Counting Stars 3965 1303 33% 0.00 1167 988 85% 3.0
Dart Scoring 217 66 30% 0.01 71 54 76% 4.6
Das Blinkenlights 3099 1303 42% 0.00 1282 1187 93% 1.9
Deduplicating Files 2214 623 28% 0.01 589 442 75% 4.6
Detailed Differences 4489 2620 58% 0.00 2488 2400 96% 1.3
Different Distances 3090 1555 50% 0.00 1399 1317 94% 1.6
Engineering English 3489 1549 44% 0.00 1469 1231 84% 2.2
Enlarging Hash Tables 1192 447 38% 0.00 351 293 83% 3.5
Erdős Numbers 544 157 29% 0.01 133 101 76% 5.0
Escape Plan 449 126 28% 0.01 108 84 78% 5.7
Estimating the Area of a Circle 2887 1862 64% 0.00 1785 1705 96% 1.5
Forest Fires 104 38 37% 0.18 34 27 79% 4.9
Functional Fun 1132 477 42% 0.00 391 370 95% 1.9
Fundamental Neighbors 726 284 39% 0.00 243 191 79% 4.7
Generalized Recursive Functions 272 119 44% 0.02 104 88 85% 4.0
Genetic Search 424 225 53% 0.00 215 193 90% 2.2
Golomb Rulers 497 274 55% 0.02 253 224 89% 3.2
Hall O' Wee Mirrors 133 62 47% 0.00 54 45 83% 5.0
Heliocentric 1481 854 58% 0.00 811 756 93% 1.8
Hitting the Targets 1555 902 58% 0.00 878 815 93% 1.7
How Many Digits? 4565 1257 28% 0.00 1053 818 78% 4.0
Hurricane Danger! 326 94 29% 0.01 102 74 73% 4.8
Image Decoding 884 272 31% 0.00 272 228 84% 3.2
In Or Out 1587 533 34% 0.00 515 453 88% 2.9
Island Hopping 821 415 51% 0.02 282 244 87% 3.6
Juggling Patterns 177 53 30% 0.00 43 27 63% 7.6
Limited Correspondence 595 151 25% 0.03 67 44 66% 6.1
Loopy Cab Drivers 150 54 36% 0.01 37 36 97% 4.0
Loopy Transit 65 31 48% 0.00 35 30 86% 5.1
Managing Packaging 494 145 29% 0.01 163 96 59% 6.2
Matrix Inverse 2071 725 35% 0.00 715 590 83% 3.2
Maximizing (And Minimizing) Your Winnings 536 231 43% 0.12 170 143 84% 4.1
Maximizing Your Pay 123 44 36% 0.00 46 31 67% 6.5
Maze Movement 135 81 60% 0.06 69 58 84% 4.4
Metaprogramming 1841 741 40% 0.00 700 610 87% 2.5
Multi-Touch Gesture Classification 105 26 25% 0.00 23 19 83% 5.7
Musical Notation 649 318 49% 0.00 310 289 93% 2.1
Music Your Way 628 310 49% 0.00 280 254 91% 2.3
Name That Permutation 367 138 38% 0.00 134 111 83% 4.3
Notable Quotables 74 10 14% 0.00 19 9 47% 7.6
Oddities 16294 9276 57% 0.00 8325 8047 97% 1.3
Out of Context 25 7 28% 0.07 10 6 60% 7.0
Pachinko Probability 225 91 40% 0.00 87 74 85% 4.5
Pachyderm Peanut Packing 360 254 71% 0.00 229 217 95% 1.8
Page Layout 244 85 35% 0.02 51 40 78% 5.5
Parallel Analysis 141 56 40% 0.65 51 40 78% 5.0
Parsing Hex 1567 451 29% 0.00 471 400 85% 2.9
Permutation Encryption 2592 1001 39% 0.00 1022 886 87% 2.5
Polish Notation 402 128 32% 0.00 129 109 84% 3.2
Preludes 1325 717 54% 0.00 702 656 93% 1.8
Primal Representation 1222 313 26% 0.02 261 184 70% 6.3
Prime Reduction 1336 477 36% 0.04 339 263 78% 4.2
Prime Spiral 357 155 43% 0.00 110 98 89% 4.0
Quick Estimates 6094 3446 57% 0.00 3252 3080 95% 1.4
Quite a Problem 2437 1022 42% 0.00 967 890 92% 1.8
Race Day 174 81 47% 0.00 72 64 89% 3.4
Reachable Roads 1197 554 46% 0.00 503 449 89% 2.4
Reversing Roads 800 207 26% 0.00 200 152 76% 5.6
Robot Protection 370 171 46% 0.02 111 100 90% 2.4
Saving Daylight 1592 879 55% 0.00 848 783 92% 1.8
Secure Doors 3182 1521 48% 0.00 1496 1368 91% 1.7
Self-Similar Strings 388 201 52% 0.02 154 133 86% 3.6
Selling Spatulas 839 111 13% 0.01 107 58 54% 7.5
Sierpiński Circumference 1908 724 38% 0.00 630 568 90% 2.5
Sneak Attack 248 14 6% 0.00 29 11 38% 9.2
Sort of Sorting 5567 2083 37% 0.01 1610 1357 84% 2.3
Statistics 5260 2314 44% 0.00 2188 2016 92% 1.7
Stirling's Approximation 699 280 40% 0.00 131 106 81% 5.0
Structural Differences 41 12 29% 0.02 14 8 57% 6.0
Substring Switcheroo 133 41 31% 0.69 49 35 71% 7.2
Sudokunique 758 86 11% 0.01 105 44 42% 8.8
Support Vector Machine 800 213 27% 0.02 225 147 65% 5.4
Surveillance Squared 128 29 23% 0.02 38 25 66% 5.4
Synchronizing Lists 2838 1752 62% 0.00 1573 1477 94% 1.7
Texture Analysis 963 489 51% 0.00 436 389 89% 2.4
The Rectangles Are Surrounding Us! 371 186 50% 0.00 171 141 82% 3.9
Transportation Planning 167 48 29% 0.05 40 38 95% 4.0
Unicycle Counting 133 36 27% 0.00 47 31 66% 6.1
Variable Arithmetic 692 276 40% 0.00 288 255 89% 2.7
Volume Amplification 219 80 37% 0.33 62 47 76% 6.6
Where to Live? 508 172 34% 0.01 145 114 79% 4.6