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| Online Judge | Problem Set | Authors | Online Contests | User | ||||||
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| Web Board Home Page F.A.Qs Statistical Charts | Current Contest Past Contests Scheduled Contests Award Contest | |||||||||
| ID | Title | Ratio(AC/submit) | Date |
| 2130 | Jogging | 10%(47/463) | May 7, 2026 |
| 2123 | Artinals | 11%(36/309) | Dec 1, 2025 |
| 2108 | Lazy Pianist | 16%(244/1521) | May 9, 2026 |
| 2162 | Document Indexing | 19%(179/931) | Dec 9, 2025 |
| 2134 | Traffic Lights | 20%(170/827) | Mar 5, 2026 |
| 2103 | Jackpot | 21%(261/1237) | May 9, 2026 |
| 2178 | Heroes Of Might And Magic | 22%(240/1062) | May 9, 2026 |
| 2113 | Agents | 22%(121/532) | Apr 16, 2026 |
| 2131 | Key Insertion | 23%(593/2544) | Apr 5, 2026 |
| 2124 | Crankshaft | 23%(225/943) | Apr 2, 2026 |
| 2170 | Lattice Animals | 24%(237/966) | Dec 9, 2025 |
| 2164 | Find the Border | 24%(181/735) | Dec 9, 2025 |
| 2167 | Irrelevant Elements | 24%(697/2809) | Apr 26, 2026 |
| 2175 | Evacuation Plan | 25%(1928/7639) | Apr 16, 2026 |
| 2127 | Greatest Common Increasing Subsequence | 25%(3769/14874) | Apr 6, 2026 |
| 2100 | Graveyard Design | 25%(4427/17330) | May 6, 2026 |
| 2133 | Cow Imposters | 26%(521/1973) | Apr 2, 2026 |
| 2169 | Kingdom of Magic | 26%(302/1128) | Nov 21, 2025 |
| 2168 | Joke with Turtles | 27%(379/1388) | May 9, 2026 |
| 2150 | Crossing Prisms | 27%(62/224) | Dec 9, 2025 |
| 2107 | Gear Profiles | 27%(122/440) | Dec 9, 2025 |
| 2197 | Jill's Tour Paths | 29%(501/1726) | Apr 5, 2026 |
| 2102 | Incredible! Impossible! | 29%(262/900) | May 8, 2026 |
| 2172 | Bricks | 29%(427/1461) | Dec 9, 2025 |
| 2198 | Boundaries on | 29%(128/437) | Nov 21, 2025 |
| 2148 | Color the Map | 29%(269/911) | Mar 20, 2026 |
| 2115 | C Looooops | 29%(12633/42744) | May 26, 2026 |
| 2119 | God of the Vile Baskers | 30%(330/1092) | Apr 2, 2026 |
| 2187 | Beauty Contest | 30%(15593/51240) | May 10, 2026 |
| 2117 | Electricity | 30%(2640/8602) | Jun 4, 2026 |
| 2154 | Color | 31%(4480/14411) | Apr 25, 2026 |
| 2157 | Maze | 31%(1558/4990) | Jun 1, 2026 |
| 2110 | Mountain Walking | 31%(1862/5901) | Apr 2, 2026 |
| 2116 | Death to Binary? | 31%(961/3009) | May 13, 2026 |
| 2125 | Destroying The Graph | 32%(3055/9459) | May 5, 2026 |
| 2114 | Boatherds | 32%(1646/5087) | Apr 22, 2026 |
| 2159 | Ancient Cipher | 32%(13673/42246) | Jun 1, 2026 |
| 2132 | Cow Math | 33%(680/2052) | Mar 21, 2026 |
| 2153 | Rank List | 33%(4192/12567) | Mar 4, 2026 |
| 2176 | Folding | 33%(808/2419) | May 16, 2026 |
| 2149 | Inherit the Spheres | 33%(152/455) | May 15, 2026 |
| 2146 | Confusing Login Names | 33%(425/1259) | Apr 2, 2026 |
| 2120 | Herbalists | 33%(61/180) | May 8, 2026 |
| 2137 | Cowties | 34%(1258/3681) | Apr 8, 2026 |
| 2158 | A Difficult Mathematics Problem | 34%(140/408) | Dec 1, 2025 |
| 2106 | Boolean Expressions | 34%(2715/7879) | May 19, 2026 |
| 2190 | ISBN | 35%(6015/17167) | May 3, 2026 |
| 2155 | Matrix | 35%(14825/42141) | Jun 2, 2026 |
| 2112 | Optimal Milking | 35%(8322/23519) | Apr 27, 2026 |
| 2138 | Travel Games | 35%(1674/4705) | Apr 2, 2026 |
| 2192 | Zipper | 36%(7513/20846) | Apr 8, 2026 |
| 2160 | Box | 36%(1608/4459) | Nov 21, 2025 |
| 2104 | K-th Number | 36%(31698/87793) | Jun 4, 2026 |
| 2165 | Gunman | 36%(533/1461) | Dec 9, 2025 |
| 2111 | Millenium Leapcow | 36%(876/2392) | Apr 2, 2026 |
| 2147 | Dice Puzzle | 36%(111/301) | Dec 1, 2025 |
| 2161 | Chandelier | 37%(505/1351) | Dec 30, 2025 |
| 2135 | Farm Tour | 38%(9358/24568) | Apr 23, 2026 |
| 2128 | Highways | 38%(1190/3119) | Jan 8, 2026 |
| 2129 | Invariant Polynomials | 38%(135/350) | Jan 8, 2026 |
| 2156 | National Day Celebration | 38%(210/543) | Apr 2, 2026 |
| 2173 | Cricket Field | 38%(383/988) | Dec 17, 2025 |
| 2171 | Amusing Numbers | 39%(520/1327) | Apr 2, 2026 |
| 2121 | Inglish-Number Translator | 39%(3387/8588) | May 21, 2026 |
| 2199 | Rate of Return | 40%(729/1821) | Jan 8, 2026 |
| 2122 | Japan Plotter Driver | 40%(296/730) | Mar 21, 2026 |
| 2186 | Popular Cows | 40%(20328/50066) | May 29, 2026 |
| 2184 | Cow Exhibition | 40%(8412/20649) | May 20, 2026 |
| 2151 | Check the difficulty of problems | 41%(4532/11032) | Apr 2, 2026 |
| 2118 | Firepersons | 41%(592/1429) | Jan 7, 2026 |
| 2179 | Inlay Cutters | 41%(1020/2435) | Dec 9, 2025 |
| 2142 | The Balance | 42%(5459/12735) | May 26, 2026 |
| 2163 | Easy Trading | 43%(1156/2685) | Dec 9, 2025 |
| 2185 | Milking Grid | 43%(5285/12256) | May 29, 2026 |
| 2174 | Decoding Task | 43%(548/1257) | Nov 20, 2025 |
| 2193 | Lenny's Lucky Lotto Lists | 43%(1009/2314) | Mar 19, 2026 |
| 2189 | Romeo Meets Juliet | 45%(749/1650) | Apr 2, 2026 |
| 2180 | Bale Figures | 45%(417/907) | Apr 2, 2026 |
| 2191 | Mersenne Composite Numbers | 46%(1257/2723) | Jan 9, 2026 |
| 2177 | Ghost Busters | 46%(157/335) | Feb 27, 2026 |
| 2136 | Vertical Histogram | 46%(10482/22355) | May 13, 2026 |
| 2139 | Six Degrees of Cowvin Bacon | 47%(5806/12189) | Jun 4, 2026 |
| 2195 | Going Home | 49%(15777/32152) | Jun 4, 2026 |
| 2194 | Stacking Cylinders | 49%(835/1698) | Apr 22, 2026 |
| 2109 | Power of Cryptography | 49%(15667/31485) | May 8, 2026 |
| 2166 | Heapsort | 50%(793/1571) | Dec 9, 2025 |
| 2126 | Factoring a Polynomial | 50%(1529/3013) | Jan 9, 2026 |
| 2152 | Fire | 51%(1487/2870) | Apr 3, 2026 |
| 2145 | Pathological Paths | 53%(166/313) | Mar 5, 2026 |
| 2101 | Honey and Milk Land | 54%(1900/3488) | Apr 2, 2026 |
| 2141 | Message Decowding | 55%(7947/14356) | May 30, 2026 |
| 2105 | IP Address | 56%(12295/21635) | Jun 2, 2026 |
| 2140 | Herd Sums | 57%(11762/20472) | May 14, 2026 |
| 2183 | Bovine Math Geniuses | 58%(2314/3980) | Apr 2, 2026 |
| 2143 | Make a Sequence | 58%(332/567) | Nov 20, 2025 |
| 2181 | Jumping Cows | 58%(5153/8739) | Jun 1, 2026 |
| 2182 | Lost Cows | 60%(12449/20605) | May 18, 2026 |
| 2188 | Cow Laundry | 63%(965/1527) | Apr 2, 2026 |
| 2144 | Leaky Cryptography | 65%(345/524) | Jan 8, 2026 |
| 2196 | Specialized Four-Digit Numbers | 66%(10567/15775) | May 29, 2026 |
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