Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 5515 1237 22% 0.00 1316 1003 76% 3.9
All Different Directions 735 326 44% 0.00 301 263 87% 2.6
Bag of Tiles 253 86 34% 0.20 65 42 65% 7.1
BASIC Interpreter 480 69 14% 0.01 80 49 61% 7.4
Bounding Robots 1237 757 61% 0.00 702 661 94% 1.6
Cellular Merging 28 4 14% 0.25 5 2 40% 7.5
Charting Progress 720 365 51% 0.00 328 296 90% 2.6
Chatter 105 32 30% 0.15 23 18 78% 6.1
Checking For Correctness 593 166 28% 0.01 153 124 81% 4.5
Connect the Dots 453 175 39% 0.00 154 135 88% 3.2
Convex Polygon Area 711 438 62% 0.00 401 375 94% 2.0
Counting Stars 3398 1134 33% 0.00 998 850 85% 2.9
Dart Scoring 170 47 28% 0.01 60 42 70% 6.4
Das Blinkenlights 2732 1117 41% 0.00 1141 1055 92% 1.8
Deduplicating Files 1890 521 28% 0.01 501 373 74% 4.6
Detailed Differences 3522 2083 59% 0.00 1969 1898 96% 1.4
Different Distances 2591 1299 50% 0.00 1156 1084 94% 1.6
Engineering English 2938 1282 44% 0.00 1241 1031 83% 2.5
Enlarging Hash Tables 1053 395 38% 0.00 318 262 82% 3.5
Erdős Numbers 496 145 29% 0.01 122 91 75% 5.2
Escape Plan 427 112 26% 0.01 98 75 77% 6.4
Estimating the Area of a Circle 2581 1675 65% 0.00 1601 1528 95% 1.5
Forest Fires 92 32 35% 0.18 29 23 79% 4.9
Functional Fun 1056 438 41% 0.00 356 339 95% 1.9
Fundamental Neighbors 706 272 39% 0.00 230 179 78% 4.7
Generalized Recursive Functions 245 104 42% 0.02 89 75 84% 3.8
Genetic Search 387 198 51% 0.00 190 170 89% 2.2
Golomb Rulers 430 231 54% 0.02 212 185 87% 3.2
Hall O' Wee Mirrors 132 61 46% 0.00 53 44 83% 5.0
Heliocentric 1128 697 62% 0.00 646 607 94% 1.7
Hitting the Targets 1157 679 59% 0.00 670 624 93% 1.7
How Many Digits? 4027 1149 29% 0.00 918 723 79% 3.7
Hurricane Danger! 249 70 28% 0.01 86 61 71% 5.1
Image Decoding 828 254 31% 0.00 258 213 83% 3.4
In Or Out 1390 456 33% 0.00 453 397 88% 3.0
Island Hopping 733 376 51% 0.02 254 218 86% 3.6
Juggling Patterns 156 49 31% 0.00 41 25 61% 8.1
Limited Correspondence 345 131 38% 0.05 60 40 67% 5.7
Loopy Cab Drivers 62 21 34% 0.01 17 16 94% 4.5
Loopy Transit 65 31 48% 0.00 35 30 86% 5.1
Managing Packaging 433 106 24% 0.01 139 73 53% 6.7
Matrix Inverse 1798 615 34% 0.00 617 498 81% 3.7
Maximizing (And Minimizing) Your Winnings 452 198 44% 0.12 132 115 87% 3.5
Maximizing Your Pay 92 27 29% 0.00 31 19 61% 6.6
Maze Movement 103 60 58% 0.06 54 45 83% 4.9
Metaprogramming 1610 626 39% 0.00 610 526 86% 2.6
Multi-Touch Gesture Classification 100 25 25% 0.00 22 18 82% 5.7
Musical Notation 617 300 49% 0.00 294 273 93% 2.1
Music Your Way 575 271 47% 0.00 247 221 89% 2.4
Name That Permutation 343 131 38% 0.00 126 104 83% 4.2
Notable Quotables 72 9 12% 0.00 17 8 47% 6.9
Oddities 13921 7850 56% 0.00 7063 6828 97% 1.3
Out of Context 22 4 18% 0.34 7 3 43% 7.7
Pachinko Probability 205 83 40% 0.00 79 68 86% 3.9
Pachyderm Peanut Packing 315 221 70% 0.00 194 185 95% 1.8
Page Layout 79 21 27% 0.02 23 17 74% 5.3
Parallel Analysis 97 37 38% 0.86 31 24 77% 5.1
Parsing Hex 1331 383 29% 0.00 404 341 84% 3.0
Permutation Encryption 2163 854 39% 0.00 864 755 87% 2.3
Polish Notation 313 99 32% 0.00 102 85 83% 3.6
Preludes 1193 648 54% 0.00 631 590 94% 1.8
Primal Representation 1148 282 25% 0.02 235 164 70% 6.4
Prime Reduction 1037 404 39% 0.04 274 218 80% 4.0
Prime Spiral 297 122 41% 0.00 96 88 92% 3.5
Quick Estimates 5252 2979 57% 0.00 2830 2678 95% 1.4
Quite a Problem 2247 929 41% 0.00 883 811 92% 1.8
Race Day 160 75 47% 0.00 66 58 88% 4.1
Reachable Roads 958 460 48% 0.00 423 376 89% 2.4
Reversing Roads 676 189 28% 0.00 171 140 82% 4.7
Robot Protection 314 145 46% 0.02 90 80 89% 2.2
Saving Daylight 1440 791 55% 0.00 754 698 93% 1.8
Secure Doors 2522 1217 48% 0.00 1190 1086 91% 1.7
Self-Similar Strings 331 175 53% 0.02 132 115 87% 3.6
Selling Spatulas 463 47 10% 0.02 70 31 44% 7.8
Sierpiński Circumference 1812 683 38% 0.00 591 535 91% 2.4
Sneak Attack 220 12 5% 0.00 25 10 40% 9.1
Sort of Sorting 4143 1481 36% 0.01 1254 1031 82% 2.5
Statistics 4479 1973 44% 0.00 1882 1724 92% 1.8
Stirling's Approximation 619 263 42% 0.00 116 94 81% 4.8
Structural Differences 36 12 33% 0.02 13 8 62% 5.5
Sudokunique 718 80 11% 0.01 93 38 41% 8.9
Support Vector Machine 757 196 26% 0.02 213 135 63% 5.8
Surveillance Squared 127 28 22% 0.02 37 24 65% 5.4
Synchronizing Lists 2529 1567 62% 0.00 1417 1333 94% 1.6
Texture Analysis 822 408 50% 0.00 365 322 88% 2.5
The Rectangles Are Surrounding Us! 356 176 49% 0.00 159 131 82% 3.9
Transportation Planning 122 38 31% 0.05 31 29 94% 4.3
Unicycle Counting 130 34 26% 0.00 45 29 64% 6.5
Variable Arithmetic 539 230 43% 0.00 240 212 88% 2.7
Volume Amplification 107 40 37% 0.33 36 27 75% 5.5
Where to Live? 480 158 33% 0.01 131 104 79% 4.4