Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 11621 2846 24% 0.00 2755 2150 78% 3.3
All Different Directions 1494 657 44% 0.00 616 547 89% 2.6
BASIC Interpreter 1676 302 18% 0.01 261 173 66% 6.4
Bag of Tiles 680 207 30% 0.10 166 117 70% 6.5
Birthday Paradox 117 44 38% 0.00 41 38 93% 3.7
Bounding Robots 2420 1407 58% 0.00 1328 1260 95% 1.6
Cellular Merging 78 9 12% 0.01 9 4 44% 8.4
Charting Progress 2548 1127 44% 0.00 948 868 92% 2.1
Chatter 168 72 43% 0.15 40 35 88% 5.1
Checking For Correctness 1321 385 29% 0.01 340 275 81% 4.2
Connect the Dots 887 336 38% 0.00 291 260 89% 3.4
Convex Polygon Area 1446 908 63% 0.00 819 776 95% 1.8
Counting Stars 7088 2299 32% 0.00 1902 1638 86% 2.9
Dart Scoring 385 139 36% 0.00 128 104 81% 4.8
Das Blinkenlights 5176 2324 45% 0.00 2033 1897 93% 1.7
Deduplicating Files 3026 898 30% 0.01 834 633 76% 4.5
Detailed Differences 10479 5531 53% 0.00 5024 4847 96% 1.4
Different Distances 4608 2303 50% 0.00 2128 1995 94% 1.7
Engineering English 4708 2172 46% 0.00 2061 1763 86% 2.1
Enlarging Hash Tables 2250 729 32% 0.00 588 488 83% 3.4
Erdős Numbers 805 248 31% 0.01 213 170 80% 4.6
Escape Plan 555 177 32% 0.01 147 114 78% 5.8
Estimating the Area of a Circle 4110 2568 62% 0.00 2488 2363 95% 1.5
Forest Fires 158 65 41% 0.18 54 44 81% 5.3
Functional Fun 1456 654 45% 0.00 558 527 94% 1.9
Fundamental Neighbors 906 380 42% 0.00 306 245 80% 4.5
Generalized Recursive Functions 376 177 47% 0.02 143 125 87% 3.7
Genetic Search 888 490 55% 0.00 417 380 91% 2.2
Gerrymandering 2409 1575 65% 0.00 1474 1419 96% 1.5
Golomb Rulers 854 446 52% 0.02 388 345 89% 3.1
Hall O' Wee Mirrors 180 84 47% 0.00 75 63 84% 4.0
Heliocentric 2335 1364 58% 0.00 1196 1125 94% 1.8
Hitting the Targets 2121 1208 57% 0.00 1174 1090 93% 1.7
How Many Digits? 5881 1639 28% 0.00 1402 1105 79% 3.9
Hurricane Danger! 630 171 27% 0.00 191 133 70% 5.8
Image Decoding 1340 410 31% 0.00 413 343 83% 3.3
Island Hopping 1762 871 49% 0.02 614 543 88% 2.9
Juggling Patterns 371 105 28% 0.00 85 60 71% 6.8
Limited Correspondence 823 182 22% 0.03 96 62 65% 7.0
Loopy Cab Drivers 329 94 29% 0.01 69 62 90% 5.3
Loopy Transit 134 73 54% 0.00 71 62 87% 3.3
Managing Packaging 650 227 35% 0.01 211 134 64% 5.8
Mandelbrot 2497 796 32% 0.00 762 662 87% 3.0
Matrix Inverse 2837 1017 36% 0.00 1001 847 85% 2.9
Maximizing (And Minimizing) Your Winnings 765 320 42% 0.07 242 204 84% 4.0
Maximizing Your Pay 306 107 35% 0.00 101 73 72% 6.1
Maze Movement 404 197 49% 0.06 169 142 84% 4.4
Metaprogramming 2683 1120 42% 0.00 1019 899 88% 2.3
Missing Numbers 4323 2295 53% 0.00 2139 2010 94% 1.6
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.5
Music Your Way 1153 583 51% 0.00 512 462 90% 2.3
Musical Notation 993 498 50% 0.00 477 448 94% 2.0
Name That Permutation 512 202 39% 0.00 202 165 82% 4.8
Notable Quotables 84 11 13% 0.00 21 10 48% 7.8
Oddities 27482 14980 55% 0.00 13364 12895 96% 1.4
Out of Context 29 9 31% 0.07 11 6 55% 8.0
Pachinko Probability 356 145 41% 0.00 147 119 81% 5.7
Pachyderm Peanut Packing 595 404 68% 0.00 386 358 93% 2.0
Page Layout 681 177 26% 0.02 113 91 81% 5.3
Parallel Analysis 240 102 42% 0.08 84 70 83% 4.1
Parsing Hex 2137 650 30% 0.00 677 577 85% 3.0
Permutation Encryption 3684 1403 38% 0.00 1432 1247 87% 2.4
Polish Notation 1297 364 28% 0.00 302 245 81% 3.4
Preludes 1845 995 54% 0.00 962 906 94% 1.8
Primal Representation 1564 440 28% 0.02 357 276 77% 5.3
Prime Reduction 2672 957 36% 0.03 628 521 83% 3.6
Prime Spiral 616 248 40% 0.00 188 166 88% 3.6
Quick Estimates 9330 5230 56% 0.00 4916 4666 95% 1.5
Quite a Problem 3616 1522 42% 0.00 1431 1299 91% 2.2
Race Day 418 171 41% 0.00 147 121 82% 4.5
Reachable Roads 2630 1287 49% 0.00 1051 959 91% 2.2
Reversing Roads 1796 423 24% 0.00 379 312 82% 4.4
Robot Protection 1243 531 43% 0.02 305 282 92% 2.5
Saving Daylight 2208 1200 54% 0.00 1159 1059 91% 2.1
Secure Doors 5293 2577 49% 0.00 2536 2314 91% 1.9
Self-Similar Strings 715 398 56% 0.02 223 196 88% 3.4
Selling Spatulas 1323 171 13% 0.01 185 101 55% 8.0
Sierpiński Circumference 2692 1001 37% 0.00 889 791 89% 2.7
Sneak Attack 375 24 6% 0.00 39 17 44% 9.1
Sort of Sorting 11424 4901 43% 0.01 3507 3084 88% 2.0
Statistics 9135 3982 44% 0.00 3750 3475 93% 1.8
Stirling's Approximation 963 391 41% 0.00 210 177 84% 4.6
Structural Differences 62 15 24% 0.01 21 11 52% 7.5
Substring Switcheroo 632 172 27% 0.26 156 121 78% 5.4
Sudokunique 1157 137 12% 0.01 155 67 43% 8.8
Support Vector Machine 1022 261 26% 0.02 265 185 70% 4.8
Surveillance Squared 167 38 23% 0.02 46 32 70% 5.6
Synchronizing Lists 4711 2871 61% 0.00 2574 2430 94% 1.5
Texture Analysis 1860 869 47% 0.00 772 684 89% 2.6
The Rectangles Are Surrounding Us! 549 283 52% 0.00 249 206 83% 3.6
Transportation Planning 282 92 33% 0.05 76 71 93% 3.9
Unicycle Counting 176 41 23% 0.00 55 36 65% 8.0
Variable Arithmetic 1167 495 42% 0.00 492 435 88% 2.6
Volume Amplification 346 112 32% 0.11 83 51 61% 7.7
Where to Live? 630 225 36% 0.01 191 152 80% 4.3
Zipline 2460 767 31% 0.00 753 606 80% 3.4