Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 7408 1713 23% 0.00 1707 1295 76% 4.4
All Different Directions 913 396 43% 0.00 363 315 87% 2.7
Bag of Tiles 338 106 31% 0.20 91 61 67% 6.8
BASIC Interpreter 1209 210 17% 0.01 174 120 69% 5.7
Bounding Robots 1652 980 59% 0.00 915 864 94% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 1900 816 43% 0.00 632 590 93% 2.2
Chatter 108 35 32% 0.15 26 21 81% 5.7
Checking For Correctness 724 211 29% 0.01 186 154 83% 4.2
Connect the Dots 601 230 38% 0.00 197 168 85% 3.7
Convex Polygon Area 964 583 60% 0.00 544 511 94% 1.9
Counting Stars 4585 1574 34% 0.00 1382 1191 86% 2.4
Dart Scoring 260 83 32% 0.01 81 63 78% 4.7
Das Blinkenlights 3323 1409 42% 0.00 1359 1260 93% 1.8
Deduplicating Files 2289 652 28% 0.01 614 462 75% 4.6
Detailed Differences 4830 2824 58% 0.00 2688 2596 97% 1.3
Different Distances 3236 1621 50% 0.00 1461 1376 94% 1.5
Engineering English 3612 1633 45% 0.00 1530 1291 84% 2.1
Enlarging Hash Tables 1318 488 37% 0.00 377 316 84% 3.5
Erdős Numbers 611 176 29% 0.01 151 115 76% 5.0
Escape Plan 457 134 29% 0.01 111 87 78% 5.6
Estimating the Area of a Circle 3021 1946 64% 0.00 1868 1784 96% 1.5
Forest Fires 115 46 40% 0.18 37 30 81% 5.1
Functional Fun 1162 496 43% 0.00 403 383 95% 1.9
Fundamental Neighbors 729 287 39% 0.00 246 194 79% 4.6
Generalized Recursive Functions 280 125 45% 0.02 106 90 85% 3.9
Genetic Search 468 250 53% 0.00 230 208 90% 2.2
Golomb Rulers 510 283 55% 0.02 259 230 89% 3.2
Hall O' Wee Mirrors 152 67 44% 0.00 61 49 80% 4.9
Heliocentric 1623 948 58% 0.00 858 801 93% 1.8
Hitting the Targets 1600 920 57% 0.00 897 832 93% 1.7
How Many Digits? 4865 1338 28% 0.00 1144 886 77% 4.0
Hurricane Danger! 338 96 28% 0.01 110 76 69% 6.2
Image Decoding 980 298 30% 0.00 297 248 84% 3.2
Island Hopping 920 473 51% 0.02 316 276 87% 3.4
Juggling Patterns 177 53 30% 0.00 43 27 63% 7.6
Limited Correspondence 600 152 25% 0.03 68 45 66% 6.1
Loopy Cab Drivers 152 54 36% 0.01 39 36 92% 5.6
Loopy Transit 76 33 43% 0.00 39 32 82% 6.2
Managing Packaging 505 154 30% 0.01 166 99 60% 6.1
Mandelbrot 1662 561 34% 0.00 537 472 88% 2.9
Matrix Inverse 2131 749 35% 0.00 738 611 83% 3.2
Maximizing (And Minimizing) Your Winnings 547 237 43% 0.12 174 146 84% 4.1
Maximizing Your Pay 155 62 40% 0.00 57 40 70% 5.8
Maze Movement 201 111 55% 0.06 81 69 85% 4.0
Metaprogramming 1958 797 41% 0.00 734 644 88% 2.4
Multi-Touch Gesture Classification 105 26 25% 0.00 23 19 83% 5.7
Musical Notation 671 327 49% 0.00 319 296 93% 2.1
Music Your Way 690 343 50% 0.00 310 280 90% 2.4
Name That Permutation 376 143 38% 0.00 139 114 82% 4.5
Notable Quotables 74 10 14% 0.00 19 9 47% 7.6
Oddities 17272 9841 57% 0.00 8810 8517 97% 1.2
Out of Context 25 7 28% 0.07 10 6 60% 7.0
Pachinko Probability 244 96 39% 0.00 93 79 85% 4.4
Pachyderm Peanut Packing 370 259 70% 0.00 235 222 94% 1.9
Page Layout 327 107 33% 0.02 61 50 82% 4.7
Parallel Analysis 142 56 39% 0.65 51 40 78% 5.2
Parsing Hex 1664 481 29% 0.00 499 426 85% 2.9
Permutation Encryption 2648 1033 39% 0.00 1054 915 87% 2.5
Polish Notation 443 146 33% 0.00 145 122 84% 3.3
Preludes 1345 731 54% 0.00 714 668 94% 1.8
Primal Representation 1250 320 26% 0.02 267 188 70% 6.2
Prime Reduction 1698 615 36% 0.04 400 320 80% 3.7
Prime Spiral 448 174 39% 0.00 125 108 86% 4.2
Quick Estimates 6366 3579 56% 0.00 3393 3212 95% 1.5
Quite a Problem 2509 1057 42% 0.00 1002 921 92% 1.8
Race Day 381 152 40% 0.00 129 108 84% 4.6
Reachable Roads 1585 773 49% 0.00 654 591 90% 2.2
Reversing Roads 900 233 26% 0.00 225 174 77% 5.3
Robot Protection 400 190 48% 0.02 120 108 90% 2.5
Saving Daylight 1653 908 55% 0.00 883 810 92% 1.9
Secure Doors 3389 1602 47% 0.00 1570 1433 91% 1.7
Self-Similar Strings 409 215 53% 0.02 165 144 87% 3.5
Selling Spatulas 873 112 13% 0.01 114 59 52% 8.3
Sierpiński Circumference 1999 759 38% 0.00 662 596 90% 2.4
Sneak Attack 360 18 5% 0.00 35 14 40% 9.2
Sort of Sorting 5989 2284 38% 0.01 1760 1493 85% 2.3
Statistics 5503 2436 44% 0.00 2302 2126 92% 1.7
Stirling's Approximation 720 289 40% 0.00 136 111 82% 4.9
Structural Differences 49 14 29% 0.01 17 10 59% 6.8
Substring Switcheroo 143 48 34% 0.47 52 38 73% 6.4
Sudokunique 812 92 11% 0.01 114 48 42% 8.9
Support Vector Machine 802 215 27% 0.02 227 149 66% 5.4
Surveillance Squared 129 29 22% 0.02 39 25 64% 6.3
Synchronizing Lists 3271 1934 59% 0.00 1711 1604 94% 1.7
Texture Analysis 1044 516 49% 0.00 455 405 89% 2.4
The Rectangles Are Surrounding Us! 372 187 50% 0.00 172 142 83% 3.9
Transportation Planning 204 59 29% 0.05 44 42 95% 4.0
Unicycle Counting 148 37 25% 0.00 48 32 67% 6.0
Variable Arithmetic 778 305 39% 0.00 324 282 87% 2.8
Volume Amplification 251 90 36% 0.19 67 49 73% 7.4
Where to Live? 514 175 34% 0.01 150 117 78% 4.7