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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 |
| 1908 | Grid Speed | 11%(43/387) | Nov 6, 2025 |
| 1954 | Warez Test | 11%(39/343) | Nov 22, 2025 |
| 1910 | Adam's Genes | 11%(33/283) | Oct 15, 2025 |
| 1919 | Ship Journey | 12%(54/419) | Nov 21, 2025 |
| 1967 | Alibaba | 14%(133/934) | Oct 15, 2025 |
| 1913 | Cocktails | 17%(102/597) | Oct 15, 2025 |
| 1902 | Illumination | 17%(61/340) | Oct 15, 2025 |
| 1911 | A Well-Formed Problem | 18%(90/485) | Oct 15, 2025 |
| 1963 | Cave Exploration | 18%(92/490) | Oct 15, 2025 |
| 1994 | Logic | 19%(27/140) | Oct 16, 2025 |
| 1960 | Time Planner | 20%(342/1710) | Nov 21, 2025 |
| 1912 | A highway and the seven dwarfs | 20%(738/3685) | Nov 6, 2025 |
| 1924 | The Treasure | 20%(492/2454) | Oct 15, 2025 |
| 1921 | Paper Cut | 20%(78/386) | Oct 15, 2025 |
| 1925 | Spiderman | 20%(1641/7986) | Nov 21, 2025 |
| 1956 | Pumps and Pipes | 20%(51/245) | Oct 15, 2025 |
| 1937 | Balanced Food | 21%(85/398) | Oct 23, 2025 |
| 1901 | Hypertransmission | 22%(454/2031) | Oct 15, 2025 |
| 1974 | The Happy Worm | 22%(1228/5451) | Nov 21, 2025 |
| 1999 | Quorf | 24%(123/511) | Oct 16, 2025 |
| 1945 | Power Hungry Cows | 24%(1770/7330) | Oct 28, 2025 |
| 1914 | Cramer's Rule | 24%(793/3276) | Nov 20, 2025 |
| 1951 | Extra Krunch | 25%(1972/7791) | Nov 21, 2025 |
| 1970 | The Game | 25%(2079/8106) | Nov 21, 2025 |
| 1965 | Cube Root | 26%(408/1534) | Oct 15, 2025 |
| 1905 | Expanding Rods | 26%(6289/23345) | Nov 25, 2025 |
| 1926 | Pollution | 27%(1148/4246) | Nov 21, 2025 |
| 1934 | Trip | 27%(2127/7832) | Nov 21, 2025 |
| 1942 | Paths on a Grid | 27%(9650/35125) | Nov 21, 2025 |
| 1932 | XYZZY | 28%(1338/4753) | Nov 21, 2025 |
| 1957 | Beehives | 28%(147/509) | Oct 21, 2025 |
| 1900 | Game | 29%(287/987) | Oct 23, 2025 |
| 1918 | Ranking List | 29%(525/1788) | Nov 21, 2025 |
| 1944 | Fiber Communications | 30%(1544/5119) | Nov 21, 2025 |
| 1916 | Rat Attack | 32%(370/1126) | Nov 21, 2025 |
| 1948 | Triangular Pastures | 33%(3429/10380) | Nov 20, 2025 |
| 1977 | Odd Loving Bakers | 33%(707/2137) | Nov 21, 2025 |
| 1923 | Fourier's Lines | 33%(945/2851) | Oct 15, 2025 |
| 1933 | A Brief Gerrymander | 33%(107/319) | Nov 20, 2025 |
| 1968 | Booklets | 33%(297/877) | Nov 21, 2025 |
| 1998 | Lloyd Fifteen Puzzle | 33%(264/777) | Nov 20, 2025 |
| 1903 | Jurassic Remains | 33%(783/2304) | Nov 21, 2025 |
| 1986 | Distance Queries | 34%(7652/22452) | Nov 20, 2025 |
| 1982 | Water Tank | 34%(92/268) | Oct 15, 2025 |
| 1988 | Cube Stacking | 34%(13354/38470) | Nov 23, 2025 |
| 1971 | Parallelogram Counting | 34%(2501/7189) | Nov 20, 2025 |
| 1943 | Hall of Fountains | 35%(315/898) | Oct 15, 2025 |
| 1907 | Work Reduction | 35%(633/1793) | Oct 15, 2025 |
| 1981 | Circle and Points | 35%(3459/9731) | Nov 20, 2025 |
| 1952 | BUY LOW, BUY LOWER | 35%(4516/12665) | Oct 15, 2025 |
| 1930 | Dead Fraction | 35%(2120/5937) | Oct 15, 2025 |
| 1987 | Distance Statistics | 35%(1061/2961) | Nov 21, 2025 |
| 1984 | Navigation Nightmare | 36%(3957/10920) | Nov 21, 2025 |
| 1950 | Dessert | 36%(2448/6753) | Nov 21, 2025 |
| 1904 | King's Quest | 36%(4295/11760) | Nov 21, 2025 |
| 1962 | Corporative Network | 37%(1875/4997) | Nov 20, 2025 |
| 1992 | Jack | 37%(1266/3341) | Nov 21, 2025 |
| 1938 | California Jones and the Gate to Freedom | 38%(318/823) | Nov 20, 2025 |
| 1935 | Journey | 38%(963/2485) | Nov 21, 2025 |
| 1939 | Diplomatic License | 39%(2860/7286) | Nov 20, 2025 |
| 1922 | Ride to School | 39%(10569/26629) | Oct 15, 2025 |
| 1980 | Unit Fraction Partition | 39%(1964/4925) | Oct 15, 2025 |
| 1964 | City Game | 40%(2903/7235) | Nov 21, 2025 |
| 1985 | Cow Marathon | 40%(5609/13835) | Nov 21, 2025 |
| 1983 | Name the Crossing | 40%(142/350) | Oct 15, 2025 |
| 1941 | The Sierpinski Fractal | 40%(2632/6436) | Oct 15, 2025 |
| 1931 | Biometrics | 40%(447/1091) | Nov 22, 2025 |
| 1928 | The Peanuts | 41%(3486/8501) | Nov 21, 2025 |
| 1936 | All in All | 41%(17384/42136) | Nov 21, 2025 |
| 1997 | Word Puzzle | 41%(517/1251) | Nov 21, 2025 |
| 1991 | Turning in Homework | 42%(602/1404) | Nov 21, 2025 |
| 1973 | Software Company | 42%(545/1270) | Nov 21, 2025 |
| 1953 | World Cup Noise | 43%(11950/27590) | Nov 20, 2025 |
| 1996 | The Highest Profits | 43%(342/788) | Nov 21, 2025 |
| 1993 | Caleidoscope | 44%(347/787) | Nov 20, 2025 |
| 1920 | Towers of Hanoi | 44%(1247/2803) | Oct 15, 2025 |
| 1927 | Area in Triangle | 44%(990/2222) | Oct 15, 2025 |
| 1990 | MooFest | 44%(6179/13773) | Nov 21, 2025 |
| 1955 | Rubik's Cube | 45%(381/843) | Nov 21, 2025 |
| 1906 | Three powers | 45%(2088/4589) | Oct 15, 2025 |
| 1915 | Knight Moves | 45%(18042/39591) | Nov 23, 2025 |
| 1947 | Rebuilding Roads | 45%(7234/15810) | Nov 21, 2025 |
| 1909 | Marbles on a tree | 46%(898/1931) | Nov 21, 2025 |
| 1949 | Chores | 46%(3596/7660) | Nov 21, 2025 |
| 1961 | Period | 47%(12551/26495) | Nov 20, 2025 |
| 1966 | Cable TV Network | 47%(2983/6230) | Oct 16, 2025 |
| 1917 | Automatic Poetry | 48%(1239/2580) | Nov 20, 2025 |
| 1979 | Red and Black | 50%(37447/74425) | Nov 24, 2025 |
| 1975 | Median Weight Bead | 50%(2273/4476) | Nov 20, 2025 |
| 1929 | Calories from Fat | 51%(650/1261) | Oct 23, 2025 |
| 1946 | Cow Cycling | 54%(1788/3259) | Oct 15, 2025 |
| 1976 | A Mini Locomotive | 55%(2838/5140) | Nov 21, 2025 |
| 1995 | Raising Modulo Numbers | 55%(15607/27876) | Nov 24, 2025 |
| 1958 | Strange Towers of Hanoi | 57%(3547/6206) | Nov 20, 2025 |
| 1989 | The Cow Lineup | 57%(3603/6277) | Nov 21, 2025 |
| 1978 | Hanafuda Shuffle | 57%(2495/4325) | Nov 20, 2025 |
| 1959 | Darts | 57%(908/1572) | Nov 21, 2025 |
| 1969 | Count on Canton | 58%(5791/9972) | Nov 20, 2025 |
| 1972 | Dice Stacking | 61%(921/1509) | Nov 21, 2025 |
| 1940 | Polygon Programming with Ease | 61%(879/1429) | Nov 20, 2025 |
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