Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 13523 3344 25% 0.00 3164 2479 78% 3.6
All Different Directions 1632 751 46% 0.00 712 635 89% 2.5
Bag of Tiles 821 260 32% 0.10 198 148 75% 6.1
BASIC Interpreter 1796 351 20% 0.01 302 204 68% 6.2
Birthday Paradox 223 86 39% 0.00 77 68 88% 4.4
Bounding Robots 2650 1532 58% 0.00 1455 1380 95% 1.6
Cellular Merging 87 11 13% 0.01 12 5 42% 8.0
Charting Progress 2851 1263 44% 0.00 1087 993 91% 2.1
Chatter 248 119 48% 0.15 67 62 93% 3.4
Checking For Correctness 1584 475 30% 0.01 413 336 81% 4.0
Connect the Dots 1087 403 37% 0.00 368 317 86% 3.7
Convex Polygon Area 1617 1014 63% 0.00 905 860 95% 1.8
Counting Stars 8129 2668 33% 0.00 2169 1874 86% 2.7
Dart Scoring 428 146 34% 0.00 140 111 79% 5.4
Das Blinkenlights 5655 2583 46% 0.00 2226 2087 94% 1.6
Deduplicating Files 3582 1070 30% 0.01 953 723 76% 4.5
Detailed Differences 11746 6205 53% 0.00 5606 5408 96% 1.4
Different Distances 4848 2450 51% 0.00 2272 2135 94% 1.6
Engineering English 5246 2471 47% 0.00 2294 1979 86% 2.0
Enlarging Hash Tables 2482 805 32% 0.00 657 549 84% 3.2
Erdős Numbers 881 277 31% 0.01 235 185 79% 4.6
Escape Plan 666 203 30% 0.01 176 136 77% 5.5
Estimating the Area of a Circle 4587 2899 63% 0.00 2777 2643 95% 1.4
Forest Fires 175 72 41% 0.18 60 50 83% 4.5
Functional Fun 1557 702 45% 0.00 607 573 94% 1.9
Fundamental Neighbors 990 407 41% 0.00 339 269 79% 4.5
Generalized Recursive Functions 599 246 41% 0.02 186 160 86% 4.0
Genetic Search 989 552 56% 0.00 468 429 92% 2.1
Gerrymandering 2760 1787 65% 0.00 1628 1567 96% 1.5
Golomb Rulers 947 495 52% 0.02 438 390 89% 3.0
Hall O' Wee Mirrors 196 89 45% 0.00 81 67 83% 4.4
Heliocentric 2529 1488 59% 0.00 1315 1240 94% 1.7
Hitting the Targets 2218 1278 58% 0.00 1241 1156 93% 1.7
How Many Digits? 6584 1854 28% 0.00 1567 1236 79% 3.6
Hurricane Danger! 764 217 28% 0.00 241 174 72% 5.3
Image Decoding 1704 501 29% 0.00 516 423 82% 3.2
Island Hopping 2173 1057 49% 0.02 765 676 88% 3.1
Juggling Patterns 492 134 27% 0.00 113 82 73% 6.0
Limited Correspondence 925 197 21% 0.03 112 71 63% 7.6
Loopy Cab Drivers 397 104 26% 0.01 79 70 89% 4.4
Loopy Transit 194 110 57% 0.00 109 95 87% 3.3
Managing Packaging 688 241 35% 0.01 223 143 64% 5.8
Mandelbrot 3038 936 31% 0.00 834 728 87% 3.0
Matrix Inverse 3183 1140 36% 0.00 1115 946 85% 2.9
Maximizing (And Minimizing) Your Winnings 806 331 41% 0.07 256 214 84% 4.1
Maximizing Your Pay 387 124 32% 0.00 115 82 71% 6.5
Maze Movement 483 251 52% 0.06 208 179 86% 4.1
Metaprogramming 2885 1233 43% 0.00 1124 1001 89% 2.1
Missing Numbers 5450 2994 55% 0.00 2684 2531 94% 1.5
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.5
Musical Notation 1120 569 51% 0.00 541 510 94% 1.9
Music Your Way 1371 702 51% 0.00 633 572 90% 2.2
Name That Permutation 564 218 39% 0.00 219 180 82% 4.8
Notable Quotables 87 12 14% 0.00 22 11 50% 7.1
Oddities 30017 16481 55% 0.00 14635 14122 96% 1.3
Out of Context 31 10 32% 0.04 12 7 58% 7.8
Pachinko Probability 399 153 38% 0.00 157 127 81% 5.8
Pachyderm Peanut Packing 667 466 70% 0.00 443 416 94% 1.9
Page Layout 752 198 26% 0.02 131 105 80% 5.8
Parallel Analysis 302 135 45% 0.08 102 88 86% 3.7
Parsing Hex 2500 774 31% 0.00 793 680 86% 2.8
Permutation Encryption 4297 1590 37% 0.00 1540 1342 87% 2.5
Polish Notation 1601 460 29% 0.00 376 308 82% 3.3
Preludes 2082 1108 53% 0.00 1078 1012 94% 1.8
Primal Representation 1722 498 29% 0.02 405 316 78% 5.0
Prime Reduction 2921 1047 36% 0.03 696 582 84% 3.5
Prime Spiral 633 260 41% 0.00 199 176 88% 3.4
Quick Estimates 10609 5984 56% 0.00 5580 5314 95% 1.4
Quite a Problem 4131 1749 42% 0.00 1636 1485 91% 2.1
Race Day 436 184 42% 0.00 155 130 84% 4.1
Reachable Roads 3164 1568 50% 0.00 1281 1167 91% 2.3
Reversing Roads 2440 557 23% 0.00 496 386 78% 4.6
Robot Protection 1399 602 43% 0.02 374 338 90% 2.6
Saving Daylight 2379 1305 55% 0.00 1252 1146 92% 2.0
Secure Doors 5742 2824 49% 0.00 2770 2534 91% 1.8
Self-Similar Strings 764 422 55% 0.02 242 214 88% 3.3
Selling Spatulas 1629 206 13% 0.01 224 125 56% 8.0
Sierpiński Circumference 2950 1116 38% 0.00 964 864 90% 2.5
Sneak Attack 483 41 8% 0.00 43 18 42% 9.0
Sort of Sorting 13143 5665 43% 0.01 4119 3646 89% 1.9
Statistics 10205 4490 44% 0.00 4193 3904 93% 1.7
Stirling's Approximation 1038 412 40% 0.00 230 192 83% 4.6
Structural Differences 62 15 24% 0.01 21 11 52% 7.5
Substring Switcheroo 763 213 28% 0.26 185 145 78% 5.4
Sudokunique 1289 194 15% 0.01 171 71 42% 8.7
Support Vector Machine 1040 270 26% 0.02 270 190 70% 4.8
Surveillance Squared 177 40 23% 0.02 51 34 67% 7.0
Synchronizing Lists 5533 3396 61% 0.00 2966 2806 95% 1.5
Texture Analysis 2751 1187 43% 0.00 1109 956 86% 2.6
The Rectangles Are Surrounding Us! 574 300 52% 0.00 267 222 83% 3.5
Transportation Planning 304 104 34% 0.05 89 80 90% 4.9
Unicycle Counting 188 43 23% 0.00 57 38 67% 8.2
Variable Arithmetic 1323 574 43% 0.00 564 502 89% 2.5
Volume Amplification 367 124 34% 0.11 89 57 64% 7.1
Where to Live? 654 237 36% 0.01 201 161 80% 4.4
Zipline 2768 906 33% 0.00 822 669 81% 3.4