Problem Set

PID Title Ratio
2012 Sort and Merge 36.40% ( 743 / 2041 )
2013 Turn Over Turn Over 16.85% ( 31 / 184 )
2014 Tiling 52.86% ( 185 / 350 )
2015 Crossed ladders 43.68% ( 556 / 1273 )
2016 Conic Distance 46.92% ( 206 / 439 )
2017 Peter's smokes 39.71% ( 857 / 2158 )
2018 Tullia and Chocolate II 48.89% ( 22 / 45 )
2019 The Top Shelf 20.71% ( 41 / 198 )
2020 Chessboard in FEN 68.57% ( 24 / 35 )
2021 Colored Sticks 27.63% ( 126 / 456 )
2022 Mersenne Composite Numbers 63.16% ( 72 / 114 )
2023 Zipper 44.00% ( 143 / 325 )
2024 Lenny's Lucky Lotto Lists 59.86% ( 85 / 142 )
2025 Going Home 62.50% ( 160 / 256 )
2026 Specialized Four-Digit Numbers 76.31% ( 438 / 574 )
2027 Jill's Tour Paths 34.48% ( 50 / 145 )
2028 Boundaries on 'A New Kind of Science' 19.05% ( 4 / 21 )
2029 Rate of Return 50.00% ( 35 / 70 )
2030 A Card Trick 64.10% ( 25 / 39 )
2031 Partitioning for fun and profit 78.26% ( 18 / 23 )
2032 ASCII Labyrinth 68.75% ( 11 / 16 )
2033 Ubiquitous Religions 54.81% ( 296 / 540 )
2034 Text Formalization 36.84% ( 7 / 19 )
2035 Center of Symmetry 41.43% ( 87 / 210 )
2036 Polynomial Remains 62.50% ( 70 / 112 )
2037 Mayor's posters 34.05% ( 79 / 232 )
2038 Queuing at the doctors 72.22% ( 13 / 18 )
2039 Grandpa's Rubik Cube 53.85% ( 7 / 13 )
2040 This Sentence is False 58.14% ( 25 / 43 )
2041 Will Indiana Jones Get There? 70.59% ( 12 / 17 )
2042 I hate SPAM, but some people love it 58.54% ( 24 / 41 )
2043 Noise Effect 89.29% ( 25 / 28 )
2044 Supermarket 53.23% ( 66 / 124 )
2045 Ambiguous permutations 62.84% ( 279 / 444 )
2046 Bullshit Bingo 50.00% ( 59 / 118 )
2047 106 miles to Chicago 60.42% ( 171 / 283 )
2048 Decorate the wall 38.81% ( 26 / 67 )
2049 Any fool can do it 42.62% ( 52 / 122 )
2050 Lazy Cows 32.65% ( 32 / 98 )
2051 Expedition 31.68% ( 134 / 423 )
2052 Around the world 72.22% ( 13 / 18 )
2053 Landscaping 20.00% ( 3 / 15 )
2054 Stacking Cylinders 82.61% ( 76 / 92 )
2055 Astonishing Movie Plan 48.44% ( 31 / 64 )
2056 Bookshelf 27.03% ( 60 / 222 )
2057 Complicated Translation 38.01% ( 366 / 963 )
2058 Diagonal Primes 59.68% ( 37 / 62 )
2059 Encrypting in a Safe Way 47.37% ( 9 / 19 )
2060 Fibonacci Problem Again 38.07% ( 217 / 570 )
2061 Great Wall Renovation 20.77% ( 38 / 183 )
2062 Help the Hurricane Victims 23.06% ( 92 / 399 )
2063 It's Pandaren Brewmaster Time! 29.07% ( 25 / 86 )
2064 Journey to Tibet 40.13% ( 183 / 456 )
2065 Fibonacci Number 53.89% ( 983 / 1824 )
2066 Word Reversal 60.03% ( 946 / 1576 )
2067 Adding 1s, 2s, and 3s 70.26% ( 319 / 454 )
2068 Triangle Centers 66.00% ( 33 / 50 )
2069 Jimmy's Riddles 46.77% ( 29 / 62 )
2070 Rhombs 42.86% ( 3 / 7 )
2071 Keep on Truckin' 68.27% ( 637 / 933 )
2072 Blurred Vision 84.47% ( 185 / 219 )
2073 The Door/Key Problem 87.50% ( 14 / 16 )
2074 Exact Change Only 39.09% ( 86 / 220 )
2075 Finding Nemo 51.72% ( 30 / 58 )
2076 Series Determination 63.19% ( 570 / 902 )
2077 T-Shirt Gumbo 66.92% ( 89 / 133 )
2078 Window Pains 67.21% ( 41 / 61 )
2079 So you want to be a 2^n-aire? 78.95% ( 30 / 38 )
2080 Ferry Loading III 56.60% ( 30 / 53 )
2081 Pick-up sticks 53.63% ( 96 / 179 )
2082 Rock-Paper-Scissors Tournament 33.02% ( 104 / 315 )
2083 Structural Equivalence 60.00% ( 3 / 5 )
2084 The Colored Cubes 44.84% ( 113 / 252 )
2085 Wavio Sequence 41.53% ( 125 / 301 )
2086 Taxes 25.00% ( 1 / 4 )
2087 Cube in Labyrinth 30.77% ( 8 / 26 )
2088 Delta-wave 50.77% ( 33 / 65 )
2089 4th point 33.81% ( 310 / 917 )
2090 Coupons 44.44% ( 4 / 9 )
2091 Chess 41.37% ( 103 / 249 )
2092 Gopher and hawks 42.50% ( 34 / 80 )
2093 Table legs 33.33% ( 5 / 15 )
2094 Common permutation 33.03% ( 143 / 433 )
2095 Security Panel 28.89% ( 13 / 45 )
2096 Roads in the North 18.31% ( 39 / 213 )
2097 Great Circle 28.57% ( 4 / 14 )
2098 Ultra-QuickSort 31.99% ( 246 / 769 )
2099 Up the Ante 33.33% ( 2 / 6 )
2100 Beat the Spread! 34.58% ( 848 / 2452 )
2101 Traditional BINGO 67.02% ( 63 / 94 )
2102 Brownie Points I 64.89% ( 170 / 262 )
2103 Magic Bitstrings 56.90% ( 33 / 58 )
2104 Cutting a polygon 50.00% ( 15 / 30 )
2105 Bungee Jumping 39.77% ( 243 / 611 )
2106 Brownie Points II 78.95% ( 15 / 19 )
2107 Crashing Robots 64.06% ( 82 / 128 )
2108 Funny Games 12.90% ( 8 / 62 )
2109 Nullary Computer 57.14% ( 12 / 21 )
2110 The Embarrassed Cryptographer 38.28% ( 49 / 128 )
2111 Electrical Outlets 84.79% ( 769 / 907 )