Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 9961 2343 24% 0.00 2293 1767 77% 3.6
All Different Directions 1222 522 43% 0.00 488 427 88% 2.6
Bag of Tiles 572 184 32% 0.10 134 98 73% 6.4
BASIC Interpreter 1492 262 18% 0.01 235 149 63% 6.4
Birthday Paradox 90 33 37% 0.00 31 28 90% 5.6
Bounding Robots 2172 1257 58% 0.00 1178 1113 94% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 2183 976 45% 0.00 784 731 93% 2.1
Chatter 141 55 39% 0.15 36 31 86% 5.1
Checking For Correctness 1172 326 28% 0.01 290 234 81% 4.3
Connect the Dots 728 272 37% 0.00 232 203 88% 3.7
Convex Polygon Area 1238 776 63% 0.00 717 678 95% 1.9
Counting Stars 5786 1980 34% 0.00 1673 1453 87% 2.4
Dart Scoring 298 100 34% 0.01 99 77 78% 4.9
Das Blinkenlights 4660 2075 45% 0.00 1820 1696 93% 1.7
Deduplicating Files 2701 788 29% 0.01 739 559 76% 4.6
Detailed Differences 8806 4795 54% 0.00 4352 4205 97% 1.3
Different Distances 3937 2022 51% 0.00 1842 1735 94% 1.6
Engineering English 4364 1978 45% 0.00 1890 1603 85% 2.2
Enlarging Hash Tables 1990 640 32% 0.00 511 423 83% 3.5
Erdős Numbers 738 219 30% 0.01 191 150 79% 4.8
Escape Plan 479 148 31% 0.01 120 95 79% 5.6
Estimating the Area of a Circle 3501 2227 64% 0.00 2154 2043 95% 1.6
Forest Fires 141 57 40% 0.18 48 39 81% 5.2
Functional Fun 1359 598 44% 0.00 506 478 94% 1.8
Fundamental Neighbors 833 329 39% 0.00 282 224 79% 4.7
Generalized Recursive Functions 352 161 46% 0.02 138 119 86% 3.8
Genetic Search 772 433 56% 0.00 363 332 91% 2.1
Gerrymandering 1851 1223 66% 0.00 1151 1111 97% 1.4
Golomb Rulers 736 378 51% 0.02 329 289 88% 3.1
Hall O' Wee Mirrors 169 76 45% 0.00 68 57 84% 4.3
Heliocentric 2054 1165 57% 0.00 1058 992 94% 1.7
Hitting the Targets 1999 1120 56% 0.00 1091 1008 92% 1.8
How Many Digits? 5736 1577 27% 0.00 1349 1058 78% 3.8
Hurricane Danger! 441 124 28% 0.00 155 102 66% 5.6
Image Decoding 1255 375 30% 0.00 379 314 83% 3.3
Island Hopping 1443 703 49% 0.02 476 418 88% 3.2
Juggling Patterns 225 75 33% 0.00 58 41 71% 6.5
Limited Correspondence 784 174 22% 0.03 85 56 66% 7.0
Loopy Cab Drivers 226 73 32% 0.01 57 50 88% 5.7
Loopy Transit 97 46 47% 0.00 48 40 83% 5.0
Managing Packaging 621 209 34% 0.01 203 126 62% 5.9
Mandelbrot 2219 707 32% 0.00 677 593 88% 3.0
Matrix Inverse 2572 908 35% 0.00 899 747 83% 3.5
Maximizing (And Minimizing) Your Winnings 702 290 41% 0.07 218 183 84% 4.0
Maximizing Your Pay 230 84 37% 0.00 75 53 71% 6.0
Maze Movement 361 178 49% 0.06 150 125 83% 4.7
Metaprogramming 2395 974 41% 0.00 885 780 88% 2.4
Missing Numbers 3297 1720 52% 0.00 1609 1508 94% 1.7
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.4
Musical Notation 888 446 50% 0.00 427 399 93% 2.0
Music Your Way 952 473 50% 0.00 416 374 90% 2.4
Name That Permutation 466 180 39% 0.00 179 143 80% 4.8
Notable Quotables 75 11 15% 0.00 20 10 50% 7.3
Oddities 23664 12925 55% 0.00 11584 11178 96% 1.3
Out of Context 29 9 31% 0.07 11 6 55% 7.9
Pachinko Probability 334 132 40% 0.00 133 106 80% 6.0
Pachyderm Peanut Packing 491 344 70% 0.00 319 300 94% 1.9
Page Layout 453 130 29% 0.02 84 65 77% 6.5
Parallel Analysis 180 79 44% 0.08 62 51 82% 4.7
Parsing Hex 1950 582 30% 0.00 604 520 86% 2.9
Permutation Encryption 3369 1272 38% 0.00 1307 1131 87% 2.5
Polish Notation 999 297 30% 0.00 250 204 82% 3.2
Preludes 1652 891 54% 0.00 858 807 94% 1.8
Primal Representation 1466 397 27% 0.02 328 246 75% 5.8
Prime Reduction 2291 804 35% 0.04 531 429 81% 3.7
Prime Spiral 578 224 39% 0.00 166 146 88% 3.7
Quick Estimates 8161 4559 56% 0.00 4273 4046 95% 1.5
Quite a Problem 3290 1375 42% 0.00 1279 1171 92% 1.9
Race Day 407 166 41% 0.00 140 117 84% 4.2
Reachable Roads 2317 1138 49% 0.00 927 845 91% 2.1
Reversing Roads 1330 321 24% 0.00 288 233 81% 4.9
Robot Protection 883 378 43% 0.02 223 204 91% 2.5
Saving Daylight 1977 1085 55% 0.00 1050 961 92% 2.1
Secure Doors 4773 2269 48% 0.00 2226 2036 91% 1.8
Self-Similar Strings 665 363 55% 0.02 199 174 87% 3.6
Selling Spatulas 1112 143 13% 0.01 153 82 54% 8.2
Sierpiński Circumference 2466 894 36% 0.00 805 712 88% 2.8
Sneak Attack 372 21 6% 0.00 38 16 42% 9.0
Sort of Sorting 9862 4038 41% 0.01 2982 2593 87% 2.4
Statistics 7619 3289 43% 0.00 3087 2857 93% 1.8
Stirling's Approximation 825 335 41% 0.00 172 144 84% 4.6
Structural Differences 61 15 25% 0.01 20 11 55% 7.4
Substring Switcheroo 584 147 25% 0.26 143 109 76% 5.2
Sudokunique 919 106 12% 0.01 129 54 42% 9.0
Support Vector Machine 867 246 28% 0.02 250 171 68% 5.0
Surveillance Squared 158 35 22% 0.02 45 30 67% 6.4
Synchronizing Lists 3985 2401 60% 0.00 2137 2016 94% 1.6
Texture Analysis 1446 706 49% 0.00 617 551 89% 2.3
The Rectangles Are Surrounding Us! 476 242 51% 0.00 215 180 84% 3.9
Transportation Planning 263 82 31% 0.05 66 61 92% 4.4
Unicycle Counting 174 40 23% 0.00 53 35 66% 6.8
Variable Arithmetic 1027 427 42% 0.00 434 381 88% 2.7
Volume Amplification 323 105 33% 0.11 81 50 62% 6.7
Where to Live? 578 203 35% 0.01 173 133 77% 4.8
Zipline 2199 665 30% 0.00 672 531 79% 3.6