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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 |
| 1994 | Logic | 19%(28/142) | Jun 3, 2026 |
| 1910 | Adam's Genes | 12%(35/289) | Jul 16, 2026 |
| 1954 | Warez Test | 11%(39/348) | Mar 20, 2026 |
| 1908 | Grid Speed | 11%(43/388) | Dec 9, 2025 |
| 1956 | Pumps and Pipes | 20%(51/246) | Dec 9, 2025 |
| 1919 | Ship Journey | 14%(60/428) | Jun 24, 2026 |
| 1902 | Illumination | 17%(61/341) | Dec 9, 2025 |
| 1921 | Paper Cut | 19%(78/394) | Jan 13, 2026 |
| 1937 | Balanced Food | 21%(85/399) | Dec 9, 2025 |
| 1911 | A Well-Formed Problem | 18%(90/487) | Dec 9, 2025 |
| 1982 | Water Tank | 34%(92/269) | Dec 9, 2025 |
| 1963 | Cave Exploration | 18%(93/496) | May 26, 2026 |
| 1913 | Cocktails | 16%(102/606) | Mar 5, 2026 |
| 1933 | A Brief Gerrymander | 33%(107/322) | Jan 7, 2026 |
| 1999 | Quorf | 23%(125/527) | Jun 8, 2026 |
| 1967 | Alibaba | 14%(133/950) | May 7, 2026 |
| 1983 | Name the Crossing | 40%(145/362) | Aug 10, 2026 |
| 1957 | Beehives | 28%(147/510) | Dec 1, 2025 |
| 1998 | Lloyd Fifteen Puzzle | 34%(269/787) | Apr 2, 2026 |
| 1900 | Game | 28%(287/1000) | Jul 2, 2026 |
| 1968 | Booklets | 33%(301/888) | Aug 29, 2026 |
| 1943 | Hall of Fountains | 35%(318/908) | Sep 5, 2026 |
| 1938 | California Jones and the Gate to Freedom | 38%(319/824) | Aug 29, 2026 |
| 1960 | Time Planner | 19%(342/1717) | Mar 5, 2026 |
| 1996 | The Highest Profits | 43%(344/790) | Jan 8, 2026 |
| 1993 | Caleidoscope | 44%(353/798) | Apr 2, 2026 |
| 1916 | Rat Attack | 33%(373/1130) | Aug 28, 2026 |
| 1955 | Rubik's Cube | 45%(382/846) | Aug 28, 2026 |
| 1965 | Cube Root | 26%(408/1541) | Mar 5, 2026 |
| 1901 | Hypertransmission | 22%(454/2033) | Jan 8, 2026 |
| 1931 | Biometrics | 41%(458/1103) | Aug 15, 2026 |
| 1924 | The Treasure | 20%(494/2461) | Aug 29, 2026 |
| 1997 | Word Puzzle | 41%(519/1263) | Apr 2, 2026 |
| 1918 | Ranking List | 29%(528/1798) | Apr 2, 2026 |
| 1973 | Software Company | 42%(550/1282) | Aug 26, 2026 |
| 1991 | Turning in Homework | 42%(603/1417) | Aug 15, 2026 |
| 1907 | Work Reduction | 35%(639/1803) | Aug 10, 2026 |
| 1929 | Calories from Fat | 51%(653/1265) | Jun 12, 2026 |
| 1977 | Odd Loving Bakers | 33%(712/2147) | Aug 13, 2026 |
| 1912 | A highway and the seven dwarfs | 19%(743/3719) | Aug 21, 2026 |
| 1903 | Jurassic Remains | 33%(783/2321) | May 30, 2026 |
| 1914 | Cramer's Rule | 24%(794/3277) | Aug 8, 2026 |
| 1940 | Polygon Programming with Ease | 61%(881/1431) | Jul 24, 2026 |
| 1909 | Marbles on a tree | 46%(906/1945) | Aug 8, 2026 |
| 1959 | Darts | 57%(908/1572) | Nov 21, 2025 |
| 1972 | Dice Stacking | 61%(922/1510) | Dec 9, 2025 |
| 1923 | Fourier's Lines | 33%(946/2854) | Aug 8, 2026 |
| 1935 | Journey | 38%(968/2497) | Aug 9, 2026 |
| 1927 | Area in Triangle | 44%(993/2228) | Aug 8, 2026 |
| 1987 | Distance Statistics | 35%(1062/2966) | Aug 9, 2026 |
| 1926 | Pollution | 27%(1149/4247) | Aug 7, 2026 |
| 1974 | The Happy Worm | 22%(1233/5465) | Apr 2, 2026 |
| 1920 | Towers of Hanoi | 44%(1248/2807) | Aug 8, 2026 |
| 1917 | Automatic Poetry | 48%(1259/2607) | Aug 8, 2026 |
| 1992 | Jack | 37%(1275/3357) | May 22, 2026 |
| 1932 | XYZZY | 28%(1348/4772) | Aug 8, 2026 |
| 1944 | Fiber Communications | 30%(1553/5135) | Aug 7, 2026 |
| 1925 | Spiderman | 20%(1643/7990) | Aug 7, 2026 |
| 1945 | Power Hungry Cows | 24%(1782/7396) | Sep 6, 2026 |
| 1946 | Cow Cycling | 54%(1794/3278) | Aug 7, 2026 |
| 1962 | Corporative Network | 37%(1900/5045) | Aug 27, 2026 |
| 1980 | Unit Fraction Partition | 39%(1965/4927) | Dec 9, 2025 |
| 1951 | Extra Krunch | 25%(1980/7810) | Aug 4, 2026 |
| 1970 | The Game | 25%(2082/8110) | May 7, 2026 |
| 1906 | Three powers | 45%(2089/4592) | Mar 5, 2026 |
| 1930 | Dead Fraction | 35%(2139/5965) | Aug 27, 2026 |
| 1975 | Median Weight Bead | 50%(2286/4498) | Aug 28, 2026 |
| 1934 | Trip | 26%(2322/8914) | Aug 7, 2026 |
| 1950 | Dessert | 36%(2453/6767) | Apr 2, 2026 |
| 1978 | Hanafuda Shuffle | 57%(2495/4325) | Nov 20, 2025 |
| 1971 | Parallelogram Counting | 34%(2508/7203) | Aug 7, 2026 |
| 1941 | The Sierpinski Fractal | 40%(2642/6454) | Aug 7, 2026 |
| 1939 | Diplomatic License | 39%(2864/7290) | Jul 24, 2026 |
| 1964 | City Game | 40%(2917/7255) | Aug 7, 2026 |
| 1976 | A Mini Locomotive | 55%(2954/5294) | Aug 6, 2026 |
| 1966 | Cable TV Network | 47%(2995/6260) | Aug 6, 2026 |
| 1948 | Triangular Pastures | 33%(3438/10396) | Sep 2, 2026 |
| 1981 | Circle and Points | 35%(3469/9749) | Sep 4, 2026 |
| 1928 | The Peanuts | 41%(3488/8505) | Jun 28, 2026 |
| 1958 | Strange Towers of Hanoi | 57%(3555/6229) | Aug 8, 2026 |
| 1989 | The Cow Lineup | 57%(3607/6285) | Apr 2, 2026 |
| 1949 | Chores | 46%(3616/7696) | Aug 25, 2026 |
| 1984 | Navigation Nightmare | 36%(3969/10945) | Aug 11, 2026 |
| 1904 | King's Quest | 36%(4309/11789) | Sep 5, 2026 |
| 1952 | BUY LOW, BUY LOWER | 35%(4524/12677) | Apr 2, 2026 |
| 1985 | Cow Marathon | 40%(5665/13987) | Aug 27, 2026 |
| 1969 | Count on Canton | 58%(5803/9984) | Apr 28, 2026 |
| 1990 | MooFest | 44%(6209/13830) | Aug 23, 2026 |
| 1905 | Expanding Rods | 26%(6315/23408) | Aug 7, 2026 |
| 1947 | Rebuilding Roads | 45%(7254/15846) | Aug 11, 2026 |
| 1986 | Distance Queries | 34%(7666/22479) | Aug 15, 2026 |
| 1942 | Paths on a Grid | 27%(9981/35944) | Aug 19, 2026 |
| 1922 | Ride to School | 39%(10586/26652) | Aug 18, 2026 |
| 1953 | World Cup Noise | 43%(12006/27690) | Jun 22, 2026 |
| 1961 | Period | 47%(12596/26571) | Aug 17, 2026 |
| 1988 | Cube Stacking | 34%(13397/38545) | Sep 3, 2026 |
| 1995 | Raising Modulo Numbers | 56%(16147/28545) | Sep 5, 2026 |
| 1936 | All in All | 41%(17402/42170) | Jul 9, 2026 |
| 1915 | Knight Moves | 45%(18084/39653) | Aug 11, 2026 |
| 1979 | Red and Black | 50%(37605/74818) | Sep 6, 2026 |
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