Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 12416 3050 25% 0.00 2914 2284 78% 3.5
All Different Directions 1556 698 45% 0.00 659 585 89% 2.6
Bag of Tiles 707 217 31% 0.10 175 125 71% 6.4
BASIC Interpreter 1691 316 19% 0.01 276 182 66% 6.4
Birthday Paradox 134 53 40% 0.00 50 46 92% 4.0
Bounding Robots 2532 1464 58% 0.00 1385 1314 95% 1.6
Cellular Merging 78 9 12% 0.01 9 4 44% 8.4
Charting Progress 2784 1231 44% 0.00 1055 963 91% 2.2
Chatter 174 77 44% 0.15 44 39 89% 5.1
Checking For Correctness 1398 416 30% 0.01 370 303 82% 4.1
Connect the Dots 990 369 37% 0.00 330 288 87% 3.7
Convex Polygon Area 1481 931 63% 0.00 842 798 95% 1.8
Counting Stars 7653 2475 32% 0.00 2040 1756 86% 2.9
Dart Scoring 418 142 34% 0.00 136 107 79% 5.6
Das Blinkenlights 5400 2444 45% 0.00 2110 1974 94% 1.7
Deduplicating Files 3428 1024 30% 0.01 912 691 76% 4.5
Detailed Differences 10835 5718 53% 0.00 5213 5026 96% 1.4
Different Distances 4704 2351 50% 0.00 2182 2042 94% 1.7
Engineering English 4879 2268 46% 0.00 2145 1837 86% 2.1
Enlarging Hash Tables 2375 756 32% 0.00 608 507 83% 3.4
Erdős Numbers 824 252 31% 0.01 221 174 79% 4.6
Escape Plan 584 187 32% 0.01 158 122 77% 5.6
Estimating the Area of a Circle 4351 2720 63% 0.00 2628 2497 95% 1.5
Forest Fires 158 65 41% 0.18 54 44 81% 5.7
Functional Fun 1501 676 45% 0.00 583 549 94% 1.9
Fundamental Neighbors 938 390 42% 0.00 319 255 80% 4.6
Generalized Recursive Functions 420 180 43% 0.02 147 127 86% 3.9
Genetic Search 925 520 56% 0.00 446 407 91% 2.2
Gerrymandering 2494 1640 66% 0.00 1526 1471 96% 1.5
Golomb Rulers 885 463 52% 0.02 408 362 89% 3.1
Hall O' Wee Mirrors 196 89 45% 0.00 81 67 83% 4.4
Heliocentric 2413 1413 59% 0.00 1242 1171 94% 1.7
Hitting the Targets 2164 1238 57% 0.00 1203 1120 93% 1.7
How Many Digits? 6083 1691 28% 0.00 1460 1146 78% 4.0
Hurricane Danger! 691 189 27% 0.00 214 149 70% 5.6
Image Decoding 1539 453 29% 0.00 466 385 83% 3.2
Island Hopping 1851 931 50% 0.02 649 579 89% 2.8
Juggling Patterns 434 115 26% 0.00 95 66 69% 7.4
Limited Correspondence 829 187 23% 0.03 98 63 64% 6.5
Loopy Cab Drivers 332 95 29% 0.01 72 63 88% 5.4
Loopy Transit 154 86 56% 0.00 82 72 88% 3.3
Managing Packaging 680 237 35% 0.01 218 139 64% 5.8
Mandelbrot 2854 864 30% 0.00 786 685 87% 3.0
Matrix Inverse 2933 1057 36% 0.00 1038 880 85% 2.9
Maximizing (And Minimizing) Your Winnings 776 324 42% 0.07 245 207 84% 4.0
Maximizing Your Pay 339 116 34% 0.00 107 77 72% 5.8
Maze Movement 419 203 48% 0.06 175 147 84% 4.4
Metaprogramming 2798 1181 42% 0.00 1076 954 89% 2.2
Missing Numbers 4741 2548 54% 0.00 2326 2189 94% 1.6
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.5
Musical Notation 1036 524 51% 0.00 502 473 94% 2.0
Music Your Way 1204 615 51% 0.00 541 489 90% 2.4
Name That Permutation 519 206 40% 0.00 206 169 82% 4.8
Notable Quotables 85 11 13% 0.00 21 10 48% 7.9
Oddities 28273 15463 55% 0.00 13766 13284 96% 1.4
Out of Context 29 9 31% 0.07 11 6 55% 8.0
Pachinko Probability 381 149 39% 0.00 153 123 80% 5.8
Pachyderm Peanut Packing 619 422 68% 0.00 402 375 93% 2.0
Page Layout 698 183 26% 0.02 118 96 81% 5.0
Parallel Analysis 246 108 44% 0.08 87 73 84% 4.0
Parsing Hex 2211 676 31% 0.00 707 603 85% 2.9
Permutation Encryption 4019 1486 37% 0.00 1471 1279 87% 2.5
Polish Notation 1389 407 29% 0.00 321 264 82% 3.3
Preludes 1963 1047 53% 0.00 1018 956 94% 1.8
Primal Representation 1589 450 28% 0.02 368 286 78% 5.2
Prime Reduction 2754 982 36% 0.03 645 538 83% 3.5
Prime Spiral 618 249 40% 0.00 189 167 88% 3.6
Quick Estimates 9869 5548 56% 0.00 5204 4948 95% 1.4
Quite a Problem 3851 1612 42% 0.00 1509 1373 91% 2.1
Race Day 429 177 41% 0.00 151 126 83% 4.2
Reachable Roads 2915 1423 49% 0.00 1156 1053 91% 2.3
Reversing Roads 1900 438 23% 0.00 417 324 78% 4.8
Robot Protection 1331 559 42% 0.02 336 304 90% 2.7
Saving Daylight 2260 1232 55% 0.00 1195 1090 91% 2.1
Secure Doors 5417 2656 49% 0.00 2617 2389 91% 1.9
Self-Similar Strings 728 405 56% 0.02 231 203 88% 3.4
Selling Spatulas 1473 187 13% 0.01 200 110 55% 8.0
Sierpiński Circumference 2746 1025 37% 0.00 912 814 89% 2.7
Sneak Attack 477 41 9% 0.00 41 18 44% 8.8
Sort of Sorting 11875 5117 43% 0.01 3691 3245 88% 2.2
Statistics 9547 4180 44% 0.00 3915 3634 93% 1.8
Stirling's Approximation 980 402 41% 0.00 215 182 85% 4.6
Structural Differences 62 15 24% 0.01 21 11 52% 7.5
Substring Switcheroo 655 179 27% 0.26 161 126 78% 5.4
Sudokunique 1271 190 15% 0.01 167 70 42% 8.7
Support Vector Machine 1024 261 25% 0.02 266 185 70% 4.8
Surveillance Squared 173 39 23% 0.02 49 33 67% 6.3
Synchronizing Lists 5093 3079 60% 0.00 2738 2585 94% 1.5
Texture Analysis 2168 966 45% 0.00 884 768 87% 2.7
The Rectangles Are Surrounding Us! 559 290 52% 0.00 257 213 83% 3.6
Transportation Planning 288 96 33% 0.05 80 73 91% 4.8
Unicycle Counting 176 41 23% 0.00 55 36 65% 7.9
Variable Arithmetic 1241 535 43% 0.00 532 473 89% 2.6
Volume Amplification 348 113 32% 0.11 84 52 62% 7.5
Where to Live? 649 234 36% 0.01 197 158 80% 4.3
Zipline 2557 822 32% 0.00 779 630 81% 3.5