Problems by Greg Hamerly

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Adding Words 8829 2074 23% 0.00 2038 1557 76% 4.0
All Different Directions 1091 462 42% 0.00 433 376 87% 2.7
Bag of Tiles 523 161 31% 0.10 124 89 72% 6.3
BASIC Interpreter 1418 241 17% 0.01 211 137 65% 6.3
Bounding Robots 1861 1083 58% 0.00 1013 958 95% 1.6
Cellular Merging 42 7 17% 0.01 6 3 50% 7.5
Charting Progress 2024 902 45% 0.00 706 663 94% 2.0
Chatter 115 40 35% 0.15 31 26 84% 5.3
Checking For Correctness 1065 290 27% 0.01 258 205 79% 4.2
Connect the Dots 675 250 37% 0.00 215 185 86% 3.7
Convex Polygon Area 1106 698 63% 0.00 649 613 94% 1.9
Counting Stars 5194 1790 34% 0.00 1540 1330 86% 2.7
Dart Scoring 287 96 33% 0.01 93 73 78% 4.6
Das Blinkenlights 4293 1902 44% 0.00 1676 1557 93% 1.8
Deduplicating Files 2434 702 29% 0.01 670 505 75% 4.7
Detailed Differences 6620 3774 57% 0.00 3504 3394 97% 1.3
Different Distances 3550 1806 51% 0.00 1625 1531 94% 1.6
Engineering English 3964 1817 46% 0.00 1710 1454 85% 2.1
Enlarging Hash Tables 1719 568 33% 0.00 462 384 83% 3.4
Erdős Numbers 661 196 30% 0.01 168 131 78% 4.7
Escape Plan 480 146 30% 0.01 119 93 78% 5.7
Estimating the Area of a Circle 3336 2107 63% 0.00 2044 1938 95% 1.6
Forest Fires 139 55 40% 0.18 47 38 81% 5.2
Functional Fun 1273 553 43% 0.00 459 436 95% 1.8
Fundamental Neighbors 762 305 40% 0.00 260 206 79% 4.7
Generalized Recursive Functions 342 156 46% 0.02 133 114 86% 3.9
Genetic Search 644 360 56% 0.00 302 276 91% 2.1
Gerrymandering 1174 786 67% 0.00 757 736 97% 1.4
Golomb Rulers 635 337 53% 0.02 298 264 89% 3.1
Hall O' Wee Mirrors 154 69 45% 0.00 62 51 82% 4.4
Heliocentric 1959 1105 56% 0.00 1001 935 93% 1.8
Hitting the Targets 1839 1037 56% 0.00 1008 931 92% 1.7
How Many Digits? 5381 1476 27% 0.00 1269 996 78% 3.7
Hurricane Danger! 398 106 27% 0.01 131 86 66% 6.0
Image Decoding 1138 343 30% 0.00 348 290 83% 3.3
Island Hopping 1282 615 48% 0.02 411 364 89% 3.0
Juggling Patterns 178 54 30% 0.00 44 28 64% 7.3
Limited Correspondence 693 173 25% 0.03 80 55 69% 6.2
Loopy Cab Drivers 191 63 33% 0.01 44 40 91% 5.9
Loopy Transit 94 45 48% 0.00 46 39 85% 5.0
Managing Packaging 578 185 32% 0.01 188 116 62% 6.1
Mandelbrot 2038 647 32% 0.00 620 543 88% 3.0
Matrix Inverse 2414 838 35% 0.00 833 687 82% 3.7
Maximizing (And Minimizing) Your Winnings 677 276 41% 0.08 209 175 84% 4.1
Maximizing Your Pay 188 75 40% 0.00 67 47 70% 6.7
Maze Movement 344 167 49% 0.06 141 117 83% 4.5
Metaprogramming 2146 864 40% 0.00 803 703 88% 2.5
Missing Numbers 2007 1095 55% 0.00 1070 1018 95% 1.6
Multi-Touch Gesture Classification 115 28 24% 0.00 25 20 80% 6.6
Musical Notation 824 409 50% 0.00 392 365 93% 2.1
Music Your Way 767 384 50% 0.00 349 314 90% 2.4
Name That Permutation 434 165 38% 0.00 164 132 80% 4.8
Notable Quotables 75 11 15% 0.00 20 10 50% 7.2
Oddities 21220 11594 55% 0.00 10309 9956 97% 1.3
Out of Context 28 9 32% 0.07 11 6 55% 7.9
Pachinko Probability 303 111 37% 0.00 115 90 78% 6.0
Pachyderm Peanut Packing 430 299 70% 0.00 273 258 95% 1.9
Page Layout 344 113 33% 0.02 77 60 78% 6.5
Parallel Analysis 164 74 45% 0.08 58 47 81% 4.7
Parsing Hex 1862 543 29% 0.00 563 483 86% 2.9
Permutation Encryption 2896 1152 40% 0.00 1171 1022 87% 2.4
Polish Notation 634 207 33% 0.00 198 167 84% 3.1
Preludes 1539 822 53% 0.00 799 750 94% 1.8
Primal Representation 1354 356 26% 0.02 294 215 73% 6.0
Prime Reduction 2172 767 35% 0.04 498 406 82% 3.7
Prime Spiral 508 199 39% 0.00 150 129 86% 4.0
Quick Estimates 7233 4071 56% 0.00 3873 3662 95% 1.5
Quite a Problem 2842 1206 42% 0.00 1156 1059 92% 1.9
Race Day 389 158 41% 0.00 134 113 84% 4.1
Reachable Roads 2042 983 48% 0.00 803 729 91% 2.2
Reversing Roads 1030 267 26% 0.00 257 203 79% 5.0
Robot Protection 784 326 42% 0.02 183 169 92% 2.4
Saving Daylight 1836 1006 55% 0.00 981 898 92% 2.0
Secure Doors 4163 2003 48% 0.00 1954 1798 92% 1.6
Self-Similar Strings 446 237 53% 0.02 181 158 87% 3.5
Selling Spatulas 984 126 13% 0.01 133 71 53% 8.1
Sierpiński Circumference 2349 851 36% 0.00 759 674 89% 2.7
Sneak Attack 372 21 6% 0.00 38 16 42% 9.0
Sort of Sorting 8600 3530 41% 0.01 2603 2245 86% 2.2
Statistics 6966 3024 43% 0.00 2847 2630 92% 1.8
Stirling's Approximation 803 323 40% 0.00 163 136 83% 4.7
Structural Differences 57 14 25% 0.01 19 10 53% 7.5
Substring Switcheroo 372 99 27% 0.26 101 76 75% 5.2
Sudokunique 888 106 12% 0.01 124 54 44% 8.8
Support Vector Machine 806 218 27% 0.02 229 151 66% 5.4
Surveillance Squared 154 32 21% 0.02 43 28 65% 6.5
Synchronizing Lists 3595 2154 60% 0.00 1906 1794 94% 1.6
Texture Analysis 1207 596 49% 0.00 529 473 89% 2.3
The Rectangles Are Surrounding Us! 417 210 50% 0.00 188 156 83% 3.9
Transportation Planning 227 69 30% 0.05 54 50 93% 4.8
Unicycle Counting 168 38 23% 0.00 50 33 66% 7.0
Variable Arithmetic 911 357 39% 0.00 372 322 87% 2.9
Volume Amplification 300 96 32% 0.11 73 44 60% 7.5
Where to Live? 571 199 35% 0.01 167 130 78% 4.6
Zipline 1593 474 30% 0.00 527 412 78% 3.9