Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 10976 2600 24% 0.00 2501 1930 77% 4.0
All Different Directions 1364 563 41% 0.00 526 462 88% 2.6
BASIC Interpreter 1620 282 17% 0.01 245 157 64% 6.7
Bag of Tiles 614 198 32% 0.10 151 109 72% 6.5
Birthday Paradox 92 35 38% 0.00 33 30 91% 4.9
Bounding Robots 2271 1321 58% 0.00 1238 1174 95% 1.6
Cellular Merging 53 7 13% 0.01 7 3 43% 8.0
Charting Progress 2274 1029 45% 0.00 833 775 93% 2.2
Chatter 168 72 43% 0.15 40 35 88% 5.0
Checking For Correctness 1253 350 28% 0.01 312 249 80% 4.3
Connect the Dots 773 293 38% 0.00 251 221 88% 3.5
Convex Polygon Area 1375 863 63% 0.00 773 734 95% 1.8
Counting Stars 6937 2238 32% 0.00 1843 1589 86% 2.9
Dart Scoring 372 128 34% 0.01 118 95 81% 4.5
Das Blinkenlights 4932 2223 45% 0.00 1939 1811 93% 1.7
Deduplicating Files 2918 864 30% 0.01 793 603 76% 4.3
Detailed Differences 9334 5100 55% 0.00 4629 4472 97% 1.4
Different Distances 4355 2186 50% 0.00 1995 1883 94% 1.6
Engineering English 4493 2057 46% 0.00 1958 1665 85% 2.2
Enlarging Hash Tables 2177 692 32% 0.00 554 459 83% 3.4
Erdős Numbers 776 233 30% 0.01 205 164 80% 4.4
Escape Plan 508 157 31% 0.01 131 103 79% 5.6
Estimating the Area of a Circle 3746 2378 63% 0.00 2302 2187 95% 1.5
Forest Fires 152 61 40% 0.18 51 42 82% 4.7
Functional Fun 1407 630 45% 0.00 536 506 94% 1.8
Fundamental Neighbors 889 370 42% 0.00 296 237 80% 4.6
Generalized Recursive Functions 375 176 47% 0.02 142 124 87% 3.7
Genetic Search 859 469 55% 0.00 396 359 91% 2.2
Gerrymandering 2121 1389 65% 0.00 1304 1261 97% 1.4
Golomb Rulers 773 398 51% 0.02 348 307 88% 3.2
Hall O' Wee Mirrors 173 79 46% 0.00 71 60 85% 3.6
Heliocentric 2210 1271 58% 0.00 1126 1057 94% 1.8
Hitting the Targets 2050 1165 57% 0.00 1133 1050 93% 1.7
How Many Digits? 5833 1620 28% 0.00 1380 1086 79% 3.7
Hurricane Danger! 509 150 29% 0.00 173 116 67% 5.9
Image Decoding 1303 395 30% 0.00 393 328 83% 3.3
Island Hopping 1518 749 49% 0.02 518 459 89% 2.9
Juggling Patterns 287 91 32% 0.00 71 51 72% 6.2
Limited Correspondence 809 179 22% 0.03 91 60 66% 6.3
Loopy Cab Drivers 319 90 28% 0.01 67 60 90% 5.3
Loopy Transit 110 52 47% 0.00 55 46 84% 5.0
Managing Packaging 643 225 35% 0.01 208 132 63% 5.9
Mandelbrot 2417 771 32% 0.00 734 641 87% 3.0
Matrix Inverse 2729 983 36% 0.00 967 813 84% 3.0
Maximizing (And Minimizing) Your Winnings 742 308 42% 0.07 231 195 84% 3.9
Maximizing Your Pay 289 104 36% 0.00 99 70 71% 5.7
Maze Movement 383 189 49% 0.06 162 135 83% 4.6
Metaprogramming 2595 1065 41% 0.00 967 849 88% 2.4
Missing Numbers 3727 1959 53% 0.00 1847 1730 94% 1.6
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.4
Music Your Way 1093 546 50% 0.00 479 429 90% 2.4
Musical Notation 960 481 50% 0.00 460 432 94% 2.0
Name That Permutation 490 194 40% 0.00 194 157 81% 4.8
Notable Quotables 75 11 15% 0.00 20 10 50% 7.2
Oddities 25263 13867 55% 0.00 12407 11984 97% 1.2
Out of Context 29 9 31% 0.07 11 6 55% 7.9
Pachinko Probability 347 140 40% 0.00 142 114 80% 5.8
Pachyderm Peanut Packing 559 380 68% 0.00 361 336 93% 1.9
Page Layout 674 174 26% 0.02 110 88 80% 5.4
Parallel Analysis 213 91 43% 0.08 74 63 85% 3.7
Parsing Hex 2061 610 30% 0.00 640 541 85% 3.1
Permutation Encryption 3519 1346 38% 0.00 1377 1198 87% 2.4
Polish Notation 1213 329 27% 0.00 283 230 81% 3.4
Preludes 1736 937 54% 0.00 903 849 94% 1.8
Primal Representation 1537 424 28% 0.02 342 261 76% 5.3
Prime Reduction 2515 903 36% 0.03 584 477 82% 3.8
Prime Spiral 590 235 40% 0.00 174 154 89% 3.5
Quick Estimates 8822 4923 56% 0.00 4621 4384 95% 1.4
Quite a Problem 3494 1472 42% 0.00 1382 1257 91% 2.1
Race Day 413 169 41% 0.00 144 119 83% 4.5
Reachable Roads 2532 1241 49% 0.00 1012 925 91% 2.2
Reversing Roads 1635 396 24% 0.00 351 289 82% 4.4
Robot Protection 1180 509 43% 0.02 285 264 93% 2.4
Saving Daylight 2116 1142 54% 0.00 1103 1008 91% 2.1
Secure Doors 5064 2437 48% 0.00 2397 2183 91% 1.9
Self-Similar Strings 692 383 55% 0.02 210 184 88% 3.4
Selling Spatulas 1201 155 13% 0.01 169 90 53% 8.3
Sierpiński Circumference 2545 933 37% 0.00 829 735 89% 2.8
Sneak Attack 372 21 6% 0.00 38 16 42% 9.0
Sort of Sorting 10359 4256 41% 0.01 3140 2735 87% 2.2
Statistics 7995 3467 43% 0.00 3255 3017 93% 1.8
Stirling's Approximation 886 368 42% 0.00 192 163 85% 4.4
Structural Differences 61 15 25% 0.01 20 11 55% 7.5
Substring Switcheroo 605 158 26% 0.26 151 116 77% 5.5
Sudokunique 1044 131 13% 0.01 141 62 44% 8.8
Support Vector Machine 869 248 29% 0.02 251 172 69% 4.7
Surveillance Squared 158 35 22% 0.02 45 30 67% 6.4
Synchronizing Lists 4397 2675 61% 0.00 2387 2255 94% 1.5
Texture Analysis 1631 777 48% 0.00 681 605 89% 2.4
The Rectangles Are Surrounding Us! 528 267 51% 0.00 238 197 83% 3.7
Transportation Planning 271 87 32% 0.05 71 66 93% 3.9
Unicycle Counting 175 40 23% 0.00 54 35 65% 8.1
Variable Arithmetic 1099 461 42% 0.00 457 403 88% 2.6
Volume Amplification 324 106 33% 0.11 81 50 62% 7.5
Where to Live? 603 214 35% 0.01 183 142 78% 4.7
Zipline 2295 714 31% 0.00 710 566 80% 3.5