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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%(47/460) | Dec 9, 2025 |
| 2123 | Artinals | 11%(36/309) | Dec 1, 2025 |
| 2108 | Lazy Pianist | 16%(244/1510) | Dec 1, 2025 |
| 2162 | Document Indexing | 19%(179/931) | Dec 9, 2025 |
| 2134 | Traffic Lights | 20%(170/823) | Dec 1, 2025 |
| 2103 | Jackpot | 21%(259/1227) | Dec 9, 2025 |
| 2178 | Heroes Of Might And Magic | 22%(240/1052) | Dec 9, 2025 |
| 2113 | Agents | 22%(121/529) | Dec 9, 2025 |
| 2131 | Key Insertion | 23%(592/2539) | Dec 9, 2025 |
| 2124 | Crankshaft | 23%(218/931) | Nov 20, 2025 |
| 2170 | Lattice Animals | 24%(237/966) | Dec 9, 2025 |
| 2164 | Find the Border | 24%(181/735) | Dec 9, 2025 |
| 2167 | Irrelevant Elements | 24%(689/2795) | Dec 9, 2025 |
| 2175 | Evacuation Plan | 25%(1921/7609) | Dec 9, 2025 |
| 2127 | Greatest Common Increasing Subsequence | 25%(3759/14838) | Dec 9, 2025 |
| 2100 | Graveyard Design | 25%(4413/17303) | Dec 9, 2025 |
| 2133 | Cow Imposters | 26%(521/1960) | Dec 9, 2025 |
| 2169 | Kingdom of Magic | 26%(302/1128) | Nov 21, 2025 |
| 2168 | Joke with Turtles | 27%(379/1387) | Dec 9, 2025 |
| 2150 | Crossing Prisms | 27%(62/224) | Dec 9, 2025 |
| 2107 | Gear Profiles | 27%(122/440) | Dec 9, 2025 |
| 2102 | Incredible! Impossible! | 28%(256/884) | Dec 9, 2025 |
| 2197 | Jill's Tour Paths | 29%(501/1718) | Dec 9, 2025 |
| 2172 | Bricks | 29%(427/1461) | Dec 9, 2025 |
| 2198 | Boundaries on | 29%(128/437) | Nov 21, 2025 |
| 2115 | C Looooops | 29%(12597/42677) | Dec 14, 2025 |
| 2148 | Color the Map | 29%(268/907) | Dec 9, 2025 |
| 2119 | God of the Vile Baskers | 30%(326/1086) | Dec 9, 2025 |
| 2187 | Beauty Contest | 30%(15581/51213) | Nov 21, 2025 |
| 2117 | Electricity | 30%(2608/8513) | Nov 21, 2025 |
| 2154 | Color | 31%(4477/14397) | Dec 9, 2025 |
| 2157 | Maze | 31%(1552/4956) | Nov 29, 2025 |
| 2110 | Mountain Walking | 31%(1856/5890) | Nov 20, 2025 |
| 2116 | Death to Binary? | 32%(960/3000) | Dec 10, 2025 |
| 2125 | Destroying The Graph | 32%(3055/9455) | Nov 21, 2025 |
| 2114 | Boatherds | 32%(1642/5074) | Dec 9, 2025 |
| 2159 | Ancient Cipher | 32%(13666/42227) | Dec 9, 2025 |
| 2132 | Cow Math | 33%(679/2045) | Nov 20, 2025 |
| 2153 | Rank List | 33%(4192/12566) | Dec 9, 2025 |
| 2176 | Folding | 33%(807/2414) | Dec 9, 2025 |
| 2149 | Inherit the Spheres | 33%(152/454) | Dec 9, 2025 |
| 2146 | Confusing Login Names | 33%(424/1253) | Dec 9, 2025 |
| 2137 | Cowties | 34%(1252/3664) | Dec 9, 2025 |
| 2158 | A Difficult Mathematics Problem | 34%(140/408) | Dec 1, 2025 |
| 2106 | Boolean Expressions | 34%(2706/7858) | Dec 15, 2025 |
| 2120 | Herbalists | 34%(61/175) | Dec 9, 2025 |
| 2190 | ISBN | 34%(6003/17154) | Nov 21, 2025 |
| 2155 | Matrix | 35%(14779/42026) | Dec 6, 2025 |
| 2112 | Optimal Milking | 35%(8318/23505) | Nov 21, 2025 |
| 2138 | Travel Games | 35%(1668/4693) | Dec 1, 2025 |
| 2192 | Zipper | 36%(7490/20799) | Nov 21, 2025 |
| 2160 | Box | 36%(1608/4459) | Nov 21, 2025 |
| 2104 | K-th Number | 36%(31641/87650) | Dec 10, 2025 |
| 2165 | Gunman | 36%(533/1461) | Dec 9, 2025 |
| 2111 | Millenium Leapcow | 36%(871/2380) | Nov 21, 2025 |
| 2147 | Dice Puzzle | 36%(111/301) | Dec 1, 2025 |
| 2161 | Chandelier | 37%(504/1350) | Dec 9, 2025 |
| 2135 | Farm Tour | 38%(9345/24539) | Dec 10, 2025 |
| 2128 | Highways | 38%(1188/3117) | Nov 21, 2025 |
| 2129 | Invariant Polynomials | 38%(133/348) | Nov 20, 2025 |
| 2173 | Cricket Field | 38%(383/987) | Nov 21, 2025 |
| 2156 | National Day Celebration | 38%(206/530) | Dec 1, 2025 |
| 2171 | Amusing Numbers | 39%(515/1316) | Dec 9, 2025 |
| 2121 | Inglish-Number Translator | 39%(3357/8549) | Nov 20, 2025 |
| 2199 | Rate of Return | 40%(729/1819) | Dec 9, 2025 |
| 2122 | Japan Plotter Driver | 40%(295/727) | Dec 9, 2025 |
| 2186 | Popular Cows | 40%(20311/50024) | Nov 21, 2025 |
| 2184 | Cow Exhibition | 40%(8393/20615) | Nov 21, 2025 |
| 2151 | Check the difficulty of problems | 41%(4519/11016) | Nov 21, 2025 |
| 2118 | Firepersons | 41%(592/1427) | Nov 20, 2025 |
| 2179 | Inlay Cutters | 41%(1020/2435) | Dec 9, 2025 |
| 2142 | The Balance | 42%(5449/12701) | Dec 9, 2025 |
| 2163 | Easy Trading | 43%(1156/2685) | Dec 9, 2025 |
| 2185 | Milking Grid | 43%(5272/12236) | Nov 21, 2025 |
| 2174 | Decoding Task | 43%(548/1257) | Nov 20, 2025 |
| 2193 | Lenny's Lucky Lotto Lists | 43%(1007/2309) | Nov 21, 2025 |
| 2189 | Romeo Meets Juliet | 45%(739/1637) | Nov 20, 2025 |
| 2180 | Bale Figures | 45%(410/895) | Nov 21, 2025 |
| 2191 | Mersenne Composite Numbers | 46%(1257/2721) | Dec 9, 2025 |
| 2177 | Ghost Busters | 46%(156/334) | Nov 20, 2025 |
| 2136 | Vertical Histogram | 46%(10472/22335) | Dec 10, 2025 |
| 2139 | Six Degrees of Cowvin Bacon | 47%(5733/12093) | Dec 14, 2025 |
| 2195 | Going Home | 49%(15736/32107) | Dec 15, 2025 |
| 2194 | Stacking Cylinders | 49%(833/1696) | Nov 21, 2025 |
| 2109 | Power of Cryptography | 49%(15664/31477) | Nov 20, 2025 |
| 2166 | Heapsort | 50%(793/1571) | Dec 9, 2025 |
| 2126 | Factoring a Polynomial | 50%(1528/3010) | Nov 20, 2025 |
| 2152 | Fire | 51%(1484/2861) | Dec 9, 2025 |
| 2145 | Pathological Paths | 53%(166/309) | Dec 1, 2025 |
| 2101 | Honey and Milk Land | 54%(1892/3476) | Nov 20, 2025 |
| 2141 | Message Decowding | 55%(7939/14341) | Dec 9, 2025 |
| 2105 | IP Address | 56%(12219/21521) | Nov 20, 2025 |
| 2140 | Herd Sums | 57%(11747/20457) | Nov 20, 2025 |
| 2183 | Bovine Math Geniuses | 58%(2303/3967) | Dec 9, 2025 |
| 2143 | Make a Sequence | 58%(332/567) | Nov 20, 2025 |
| 2181 | Jumping Cows | 58%(5135/8708) | Nov 21, 2025 |
| 2182 | Lost Cows | 60%(12430/20568) | Dec 15, 2025 |
| 2188 | Cow Laundry | 62%(954/1515) | Dec 9, 2025 |
| 2144 | Leaky Cryptography | 65%(343/522) | Dec 9, 2025 |
| 2196 | Specialized Four-Digit Numbers | 66%(10558/15761) | Dec 10, 2025 |
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