Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 4898 1094 22% 0.00 1170 882 75% 3.8
All Different Directions 626 280 45% 0.00 262 228 87% 2.7
Bag of Tiles 235 78 33% 0.22 60 37 62% 8.0
BASIC Interpreter 420 59 14% 0.01 70 43 61% 5.6
Bounding Robots 1111 666 60% 0.00 612 575 94% 1.6
Cellular Merging 28 4 14% 0.25 5 2 40% 7.5
Charting Progress 675 348 52% 0.00 310 280 90% 2.6
Chatter 102 30 29% 0.15 20 16 80% 5.2
Checking For Correctness 543 153 28% 0.01 142 113 80% 4.6
Connect the Dots 348 136 39% 0.00 111 97 87% 3.5
Convex Polygon Area 565 355 63% 0.00 321 300 93% 2.0
Counting Stars 2582 904 35% 0.00 825 701 85% 2.8
Dart Scoring 150 38 25% 0.01 50 35 70% 4.9
Deduplicating Files 1716 465 27% 0.01 451 333 74% 4.5
Detailed Differences 3050 1823 60% 0.00 1731 1669 96% 1.3
Different Distances 2233 1121 50% 0.00 990 930 94% 1.5
Engineering English 2669 1178 44% 0.00 1138 946 83% 2.4
Enlarging Hash Tables 915 343 37% 0.00 275 227 83% 3.4
Erdős Numbers 410 118 29% 0.01 95 72 76% 5.8
Escape Plan 400 106 26% 0.01 89 70 79% 5.0
Estimating the Area of a Circle 2242 1455 65% 0.00 1374 1317 96% 1.4
Forest Fires 61 21 34% 0.18 22 16 73% 5.5
Functional Fun 991 401 40% 0.00 324 309 95% 1.9
Fundamental Neighbors 610 238 39% 0.00 200 153 76% 4.9
Generalized Recursive Functions 233 95 41% 0.02 81 67 83% 4.2
Genetic Search 370 189 51% 0.00 180 161 89% 2.1
Golomb Rulers 400 213 53% 0.02 195 169 87% 3.2
Hall O' Wee Mirrors 129 58 45% 0.00 50 41 82% 5.4
Heliocentric 1043 645 62% 0.00 600 565 94% 1.7
Hitting the Targets 1107 644 58% 0.00 637 592 93% 1.7
How Many Digits? 3555 1028 29% 0.00 802 637 79% 3.4
Hurricane Danger! 221 64 29% 0.01 79 55 70% 6.0
Image Decoding 785 244 31% 0.00 245 203 83% 3.3
In Or Out 1267 415 33% 0.00 407 358 88% 2.9
Island Hopping 683 358 52% 0.02 236 201 85% 3.7
Juggling Patterns 153 47 31% 0.00 39 23 59% 8.1
Limited Correspondence 244 56 23% 0.05 50 33 66% 6.4
Loopy Cab Drivers 56 18 32% 0.01 14 13 93% 4.6
Loopy Transit 62 28 45% 0.00 32 27 84% 4.9
Managing Packaging 417 98 24% 0.01 133 67 50% 6.9
Matrix Inverse 1583 572 36% 0.00 548 461 84% 2.7
Maximizing (And Minimizing) Your Winnings 435 188 43% 0.12 128 111 87% 3.6
Maximizing Your Pay 87 25 29% 0.00 29 17 59% 7.0
Maze Movement 90 52 58% 0.06 47 39 83% 4.4
Metaprogramming 1552 592 38% 0.00 580 495 85% 2.6
Multi-Touch Gesture Classification 56 16 29% 0.00 19 16 84% 5.7
Musical Notation 578 279 48% 0.00 276 256 93% 2.1
Music Your Way 492 236 48% 0.00 209 186 89% 2.5
Name That Permutation 308 121 39% 0.00 119 95 80% 5.0
Notable Quotables 72 9 12% 0.00 17 8 47% 6.8
Oddities 12223 6926 57% 0.00 6281 6076 97% 1.3
Out of Context 22 4 18% 0.34 7 3 43% 7.7
Pachinko Probability 175 67 38% 0.00 62 53 85% 4.9
Pachyderm Peanut Packing 266 185 70% 0.00 158 151 96% 1.8
Page Layout 56 15 27% 0.02 17 13 76% 5.7
Parallel Analysis 71 27 38% 0.86 24 17 71% 6.6
Parsing Hex 1195 346 29% 0.00 362 307 85% 2.8
Permutation Encryption 2046 804 39% 0.00 815 709 87% 2.3
Polish Notation 258 86 33% 0.00 88 74 84% 3.2
Preludes 968 553 57% 0.00 538 506 94% 1.7
Primal Representation 1128 273 24% 0.02 226 156 69% 6.5
Prime Reduction 870 308 35% 0.04 250 194 78% 4.1
Prime Spiral 260 110 42% 0.00 82 77 94% 2.7
Quick Estimates 4805 2686 56% 0.00 2546 2404 94% 1.5
Quite a Problem 2060 856 42% 0.00 814 745 92% 1.8
Race Day 140 68 49% 0.00 60 53 88% 3.8
Reachable Roads 733 358 49% 0.00 328 294 90% 2.2
Reversing Roads 613 177 29% 0.00 155 128 83% 4.7
Robot Protection 210 84 40% 0.02 71 62 87% 2.6
Saving Daylight 1255 699 56% 0.00 658 609 93% 1.7
Secure Doors 2355 1118 47% 0.00 1101 999 91% 1.8
Self-Similar Strings 302 162 54% 0.02 118 102 86% 3.8
Selling Spatulas 433 41 9% 0.02 64 26 41% 8.2
Sierpiński Circumference 1544 596 39% 0.00 517 466 90% 2.4
Sneak Attack 162 8 5% 0.00 21 8 38% 8.8
Sort of Sorting 3587 1257 35% 0.01 1080 882 82% 2.4
Statistics 3910 1745 45% 0.00 1679 1537 92% 1.8
Stirling's Approximation 573 260 45% 0.00 110 91 83% 4.2
Structural Differences 33 11 33% 0.04 12 7 58% 5.6
Sudokunique 640 74 12% 0.01 80 33 41% 8.9
Support Vector Machine 753 192 25% 0.02 211 132 63% 5.9
Surveillance Squared 126 27 21% 0.02 36 23 64% 5.4
Synchronizing Lists 1955 1261 65% 0.00 1154 1094 95% 1.5
Texture Analysis 623 309 50% 0.00 279 248 89% 2.5
The Rectangles Are Surrounding Us! 288 143 50% 0.00 133 111 83% 3.4
Transportation Planning 72 29 40% 0.05 23 22 96% 4.1
Unicycle Counting 96 27 28% 0.00 35 23 66% 6.0
Variable Arithmetic 471 203 43% 0.00 211 186 88% 2.6
Volume Amplification 84 25 30% 0.33 27 19 70% 5.8
Where to Live? 426 140 33% 0.01 113 89 79% 3.8