Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 8115 1939 24% 0.00 1882 1447 77% 3.6
All Different Directions 1007 438 43% 0.00 407 354 87% 2.6
Bag of Tiles 414 143 35% 0.15 109 78 72% 5.8
BASIC Interpreter 1328 233 18% 0.01 193 132 68% 5.8
Bounding Robots 1726 1028 60% 0.00 961 910 95% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 1972 863 44% 0.00 672 629 94% 2.1
Chatter 112 38 34% 0.15 29 24 83% 5.5
Checking For Correctness 796 232 29% 0.01 207 173 84% 4.1
Connect the Dots 650 244 38% 0.00 208 179 86% 3.6
Convex Polygon Area 1057 665 63% 0.00 616 582 94% 1.9
Counting Stars 4894 1700 35% 0.00 1462 1267 87% 2.4
Dart Scoring 279 93 33% 0.01 90 70 78% 4.7
Das Blinkenlights 3665 1612 44% 0.00 1485 1380 93% 1.8
Deduplicating Files 2382 682 29% 0.01 646 488 76% 4.5
Detailed Differences 5593 3250 58% 0.00 3055 2955 97% 1.3
Different Distances 3432 1726 50% 0.00 1563 1470 94% 1.6
Engineering English 3799 1738 46% 0.00 1632 1384 85% 2.1
Enlarging Hash Tables 1486 519 35% 0.00 409 341 83% 3.5
Erdős Numbers 635 187 29% 0.01 162 125 77% 4.7
Escape Plan 472 140 30% 0.01 116 90 78% 5.8
Estimating the Area of a Circle 3185 2034 64% 0.00 1968 1869 95% 1.6
Forest Fires 124 53 43% 0.18 44 37 84% 4.4
Functional Fun 1249 538 43% 0.00 445 421 95% 1.9
Fundamental Neighbors 752 302 40% 0.00 256 203 79% 4.6
Generalized Recursive Functions 328 153 47% 0.02 130 112 86% 3.7
Genetic Search 610 334 55% 0.00 285 260 91% 2.1
Golomb Rulers 618 329 53% 0.02 291 257 88% 3.2
Hall O' Wee Mirrors 154 69 45% 0.00 62 51 82% 4.3
Heliocentric 1816 1029 57% 0.00 925 865 94% 1.8
Hitting the Targets 1766 1005 57% 0.00 979 906 93% 1.7
How Many Digits? 5161 1428 28% 0.00 1220 956 78% 3.6
Hurricane Danger! 352 100 28% 0.01 114 80 70% 4.9
Image Decoding 1063 325 31% 0.00 325 273 84% 3.2
Island Hopping 1178 576 49% 0.02 389 345 89% 3.1
Juggling Patterns 178 54 30% 0.00 44 28 64% 7.3
Limited Correspondence 646 166 26% 0.03 73 51 70% 4.3
Loopy Cab Drivers 191 63 33% 0.01 44 40 91% 5.8
Loopy Transit 85 39 46% 0.00 44 37 84% 5.4
Managing Packaging 522 161 31% 0.01 173 105 61% 6.1
Mandelbrot 1886 613 33% 0.00 589 516 88% 3.0
Matrix Inverse 2291 797 35% 0.00 785 652 83% 3.1
Maximizing (And Minimizing) Your Winnings 670 271 40% 0.08 204 170 83% 4.1
Maximizing Your Pay 187 75 40% 0.00 66 47 71% 6.1
Maze Movement 310 156 50% 0.06 125 107 86% 3.7
Metaprogramming 2074 838 40% 0.00 773 681 88% 2.4
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.4
Musical Notation 754 364 48% 0.00 352 327 93% 2.1
Music Your Way 733 363 50% 0.00 328 296 90% 2.4
Name That Permutation 422 160 38% 0.00 159 128 81% 4.7
Notable Quotables 75 11 15% 0.00 20 10 50% 7.2
Oddities 18653 10590 57% 0.00 9437 9118 97% 1.3
Out of Context 27 9 33% 0.07 10 6 60% 7.0
Pachinko Probability 257 102 40% 0.00 98 82 84% 4.8
Pachyderm Peanut Packing 410 286 70% 0.00 260 245 94% 1.9
Page Layout 344 113 33% 0.02 77 60 78% 6.5
Parallel Analysis 164 74 45% 0.08 58 47 81% 4.6
Parsing Hex 1771 516 29% 0.00 535 459 86% 2.8
Permutation Encryption 2796 1104 39% 0.00 1119 977 87% 2.4
Polish Notation 555 184 33% 0.00 175 147 84% 3.2
Preludes 1493 795 53% 0.00 777 727 94% 1.8
Primal Representation 1330 348 26% 0.02 285 208 73% 6.0
Prime Reduction 2046 742 36% 0.04 475 388 82% 3.5
Prime Spiral 485 187 39% 0.00 140 119 85% 4.4
Quick Estimates 6728 3781 56% 0.00 3592 3401 95% 1.5
Quite a Problem 2637 1126 43% 0.00 1065 982 92% 1.8
Race Day 385 156 41% 0.00 132 111 84% 4.2
Reachable Roads 1943 942 48% 0.00 770 700 91% 2.2
Reversing Roads 965 246 25% 0.00 236 185 78% 5.1
Robot Protection 699 283 40% 0.02 164 153 93% 2.3
Saving Daylight 1744 957 55% 0.00 933 855 92% 2.0
Secure Doors 3772 1831 49% 0.00 1778 1637 92% 1.6
Self-Similar Strings 418 220 53% 0.02 169 148 88% 3.4
Selling Spatulas 954 122 13% 0.01 128 67 52% 8.2
Sierpiński Circumference 2074 798 38% 0.00 695 628 90% 2.4
Sneak Attack 362 18 5% 0.00 35 14 40% 9.2
Sort of Sorting 6554 2565 39% 0.01 1962 1674 85% 2.3
Statistics 6025 2686 45% 0.00 2513 2332 93% 1.6
Stirling's Approximation 760 309 41% 0.00 150 123 82% 5.0
Structural Differences 53 14 26% 0.01 18 10 56% 7.5
Substring Switcheroo 262 80 31% 0.26 77 59 77% 4.6
Sudokunique 874 104 12% 0.01 119 52 44% 8.8
Support Vector Machine 802 215 27% 0.02 227 149 66% 5.4
Surveillance Squared 153 31 20% 0.02 42 27 64% 6.7
Synchronizing Lists 3431 2047 60% 0.00 1814 1705 94% 1.6
Texture Analysis 1147 564 49% 0.00 498 444 89% 2.4
The Rectangles Are Surrounding Us! 404 202 50% 0.00 179 148 83% 3.9
Transportation Planning 212 65 31% 0.05 49 47 96% 3.9
Unicycle Counting 165 38 23% 0.00 49 33 67% 6.1
Variable Arithmetic 891 350 39% 0.00 365 315 86% 2.9
Volume Amplification 300 96 32% 0.11 73 44 60% 7.5
Where to Live? 552 192 35% 0.01 156 123 79% 4.7