Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 7787 1836 24% 0.00 1797 1370 76% 4.1
All Different Directions 965 418 43% 0.00 390 337 86% 2.7
Bag of Tiles 339 107 32% 0.20 92 62 67% 6.8
BASIC Interpreter 1248 222 18% 0.01 180 125 69% 5.7
Bounding Robots 1692 1005 59% 0.00 939 888 95% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 1942 846 44% 0.00 655 612 93% 2.2
Chatter 111 37 33% 0.15 28 23 82% 5.5
Checking For Correctness 752 219 29% 0.01 194 162 84% 4.3
Connect the Dots 614 234 38% 0.00 202 172 85% 3.7
Convex Polygon Area 1032 641 62% 0.00 596 562 94% 1.9
Counting Stars 4830 1672 35% 0.00 1440 1247 87% 2.4
Dart Scoring 273 89 33% 0.01 86 68 79% 4.2
Das Blinkenlights 3511 1513 43% 0.00 1414 1314 93% 1.8
Deduplicating Files 2339 666 28% 0.01 627 473 75% 4.5
Detailed Differences 5302 3096 58% 0.00 2902 2806 97% 1.3
Different Distances 3354 1673 50% 0.00 1512 1421 94% 1.6
Engineering English 3702 1680 45% 0.00 1577 1334 85% 2.1
Enlarging Hash Tables 1350 503 37% 0.00 388 326 84% 3.5
Erdős Numbers 629 184 29% 0.01 159 122 77% 5.0
Escape Plan 472 140 30% 0.01 116 90 78% 5.6
Estimating the Area of a Circle 3143 2002 64% 0.00 1936 1837 95% 1.6
Forest Fires 124 53 43% 0.18 44 37 84% 4.4
Functional Fun 1213 525 43% 0.00 432 409 95% 1.9
Fundamental Neighbors 740 297 40% 0.00 252 201 80% 4.6
Generalized Recursive Functions 319 146 46% 0.02 124 107 86% 3.6
Genetic Search 584 320 55% 0.00 271 247 91% 2.2
Golomb Rulers 566 310 55% 0.02 271 241 89% 3.1
Hall O' Wee Mirrors 153 68 44% 0.00 62 50 81% 4.8
Heliocentric 1714 986 58% 0.00 894 834 93% 1.8
Hitting the Targets 1745 989 57% 0.00 966 893 92% 1.7
How Many Digits? 5036 1396 28% 0.00 1190 930 78% 3.9
Hurricane Danger! 349 99 28% 0.01 112 79 71% 5.9
Image Decoding 1055 321 30% 0.00 321 269 84% 3.2
Island Hopping 961 488 51% 0.02 330 289 88% 3.4
Juggling Patterns 178 54 30% 0.00 44 28 64% 7.2
Limited Correspondence 628 160 25% 0.03 70 47 67% 5.6
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 516 159 31% 0.01 170 103 61% 6.0
Mandelbrot 1781 590 33% 0.00 569 498 88% 3.0
Matrix Inverse 2250 781 35% 0.00 767 636 83% 3.2
Maximizing (And Minimizing) Your Winnings 644 257 40% 0.08 194 160 82% 4.3
Maximizing Your Pay 163 64 39% 0.00 60 42 70% 6.0
Maze Movement 280 143 51% 0.06 112 98 88% 3.4
Metaprogramming 1994 820 41% 0.00 756 666 88% 2.3
Multi-Touch Gesture Classification 113 28 25% 0.00 24 20 83% 5.4
Musical Notation 675 331 49% 0.00 323 300 93% 2.1
Music Your Way 726 358 49% 0.00 323 291 90% 2.4
Name That Permutation 423 157 37% 0.00 158 128 81% 4.6
Notable Quotables 74 10 14% 0.00 19 9 47% 7.6
Oddities 18207 10309 57% 0.00 9176 8866 97% 1.3
Out of Context 27 9 33% 0.07 10 6 60% 7.0
Pachinko Probability 248 96 39% 0.00 95 79 83% 4.8
Pachyderm Peanut Packing 390 272 70% 0.00 249 235 94% 1.9
Page Layout 387 123 32% 0.02 73 58 79% 6.4
Parallel Analysis 152 66 43% 0.08 52 41 79% 5.1
Parsing Hex 1754 508 29% 0.00 529 452 85% 2.8
Permutation Encryption 2713 1066 39% 0.00 1081 941 87% 2.4
Polish Notation 480 159 33% 0.00 161 135 84% 3.2
Preludes 1400 757 54% 0.00 742 692 93% 1.8
Primal Representation 1275 329 26% 0.02 277 196 71% 6.2
Prime Reduction 1988 729 37% 0.04 465 382 82% 3.5
Prime Spiral 458 182 40% 0.00 134 116 87% 4.1
Quick Estimates 6541 3680 56% 0.00 3495 3306 95% 1.5
Quite a Problem 2581 1095 42% 0.00 1036 954 92% 1.8
Race Day 382 153 40% 0.00 130 109 84% 4.3
Reachable Roads 1837 907 49% 0.00 744 678 91% 2.1
Reversing Roads 946 240 25% 0.00 231 180 78% 5.1
Robot Protection 684 273 40% 0.02 156 145 93% 2.2
Saving Daylight 1690 931 55% 0.00 905 831 92% 1.9
Secure Doors 3604 1725 48% 0.00 1683 1541 92% 1.7
Self-Similar Strings 414 217 52% 0.02 167 146 87% 3.4
Selling Spatulas 889 117 13% 0.01 117 62 53% 8.0
Sierpiński Circumference 2041 779 38% 0.00 680 613 90% 2.5
Sneak Attack 360 18 5% 0.00 35 14 40% 9.1
Sort of Sorting 6201 2375 38% 0.01 1843 1565 85% 2.4
Statistics 5771 2543 44% 0.00 2392 2215 93% 1.7
Stirling's Approximation 756 307 41% 0.00 148 121 82% 5.0
Structural Differences 53 14 26% 0.01 18 10 56% 7.5
Substring Switcheroo 153 50 33% 0.47 55 40 73% 6.2
Sudokunique 884 104 12% 0.01 118 52 44% 8.7
Support Vector Machine 802 215 27% 0.02 227 149 66% 5.4
Surveillance Squared 143 30 21% 0.02 41 26 63% 6.8
Synchronizing Lists 3331 1981 59% 0.00 1756 1649 94% 1.6
Texture Analysis 1110 543 49% 0.00 480 427 89% 2.4
The Rectangles Are Surrounding Us! 376 190 51% 0.00 175 144 82% 3.9
Transportation Planning 210 63 30% 0.05 47 45 96% 4.0
Unicycle Counting 148 37 25% 0.00 48 32 67% 6.0
Variable Arithmetic 831 327 39% 0.00 344 296 86% 2.9
Volume Amplification 281 86 31% 0.11 71 40 56% 8.3
Where to Live? 514 175 34% 0.01 150 117 78% 4.6