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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 |
| 1800 | Magic Trick | 21%(203/924) | 2020-11-17 |
| 1801 | Formula Racing | 23%(87/367) | 2020-9-18 |
| 1802 | Ancient Plates | 13%(42/322) | 2020-7-3 |
| 1803 | Box Art | 12%(140/1090) | 2020-11-18 |
| 1804 | Brainman | 49%(7624/15383) | 2021-1-23 |
| 1805 | Friends | 22%(166/740) | 2019-10-6 |
| 1806 | Manhattan 2025 | 45%(1220/2676) | 2021-1-17 |
| 1807 | Mayan Dates | 28%(45/158) | 2019-8-14 |
| 1808 | Quadratic Residues | 34%(673/1979) | 2020-8-24 |
| 1809 | Regetni | 38%(746/1945) | 2020-11-12 |
| 1810 | Covering | 16%(169/1048) | 2020-6-5 |
| 1811 | Prime Test | 26%(11360/42201) | 2021-1-20 |
| 1812 | Zuma Game | 19%(117/598) | 2020-12-28 |
| 1813 | Overlapped Shapes | 28%(181/636) | 2020-9-22 |
| 1814 | Polynomial | 6%(27/431) | 2019-10-6 |
| 1815 | Friendship | 28%(3502/12469) | 2021-1-22 |
| 1816 | Wild Words | 27%(1879/6811) | 2021-1-8 |
| 1817 | Traffic Jam | 46%(163/349) | 2020-12-29 |
| 1818 | ATP | 39%(393/1000) | 2020-10-16 |
| 1819 | Disks | 25%(469/1854) | 2021-1-2 |
| 1820 | Expression | 0%(22/2356) | 2019-10-6 |
| 1821 | Fence | 33%(2659/7856) | 2021-1-20 |
| 1822 | Fence2 | 37%(146/392) | 2021-1-18 |
| 1823 | Hotel | 43%(1336/3089) | 2020-12-28 |
| 1824 | TwoFour | 29%(78/264) | 2020-10-28 |
| 1825 | Young | 23%(157/668) | 2020-11-26 |
| 1826 | The Best Farm | 29%(652/2199) | 2020-11-16 |
| 1827 | A Bunch Of Monsters | 39%(421/1069) | 2020-11-12 |
| 1828 | Monkeys' Pride | 33%(3267/9793) | 2020-11-16 |
| 1829 | 火力防御网 | 23%(78/337) | 2020-9-21 |
| 1830 | 开关问题 | 40%(5259/13029) | 2021-1-23 |
| 1831 | 不定方程组 | 29%(257/879) | 2021-1-20 |
| 1832 | 连环锁 | 31%(464/1453) | 2020-9-23 |
| 1833 | 排列 | 36%(8991/24894) | 2021-1-22 |
| 1834 | 线段处理 | 12%(91/743) | 2020-4-22 |
| 1835 | 宇航员 | 40%(3578/8741) | 2021-1-22 |
| 1836 | Alignment | 32%(6985/21523) | 2021-1-21 |
| 1837 | Balance | 62%(11594/18471) | 2021-1-23 |
| 1838 | Banana | 36%(911/2477) | 2020-10-3 |
| 1839 | Cattle | 15%(51/320) | 2020-11-12 |
| 1840 | Eqs | 48%(9353/19325) | 2021-1-21 |
| 1841 | Meadow | 16%(102/601) | 2020-6-8 |
| 1842 | Parking | 21%(44/208) | 2020-6-9 |
| 1843 | Shire | 15%(22/141) | 2019-12-23 |
| 1844 | Sum | 65%(7414/11333) | 2021-1-22 |
| 1845 | Sumdiv | 24%(9218/37793) | 2021-1-23 |
| 1846 | System | 26%(110/414) | 2019-9-25 |
| 1847 | Tram | 37%(9040/24128) | 2021-1-22 |
| 1848 | Tree | 35%(1516/4253) | 2020-7-6 |
| 1849 | Two | 55%(1623/2946) | 2021-1-23 |
| 1850 | Code | 48%(5587/11501) | 2021-1-14 |
| 1851 | Map | 20%(162/775) | 2021-1-20 |
| 1852 | Ants | 36%(14261/38695) | 2021-1-23 |
| 1853 | Cat | 25%(523/2037) | 2020-9-21 |
| 1854 | Evil Straw Warts Live | 29%(797/2669) | 2021-1-17 |
| 1855 | Mint | 34%(600/1724) | 2020-6-6 |
| 1856 | Sea Battle | 35%(1219/3420) | 2021-1-21 |
| 1857 | To Europe! To Europe! | 33%(403/1207) | 2021-1-14 |
| 1858 | Interesting Maze Game | 26%(101/386) | 2020-9-3 |
| 1859 | The Perfect Symmetry | 38%(549/1419) | 2020-9-20 |
| 1860 | Currency Exchange | 38%(18722/48224) | 2021-1-23 |
| 1861 | Network | 40%(7755/19241) | 2021-1-22 |
| 1862 | Stripies | 42%(11330/26736) | 2021-1-21 |
| 1863 | Subnumber | 11%(122/1072) | 2020-12-13 |
| 1864 | Funny Card Game | 10%(18/169) | 2019-9-25 |
| 1865 | Practice | 44%(86/194) | 2020-8-13 |
| 1866 | Help! | 25%(107/421) | 2020-6-28 |
| 1867 | Treequivalence | 25%(106/419) | 2020-6-9 |
| 1868 | Antiarithmetic? | 50%(732/1462) | 2020-12-14 |
| 1869 | Test | 40%(127/315) | 2020-12-19 |
| 1870 | Bee Breeding | 42%(769/1830) | 2021-1-2 |
| 1871 | Bullet Hole | 5%(22/379) | 2019-3-27 |
| 1872 | A Dicey Problem | 32%(346/1063) | 2020-12-29 |
| 1873 | The Fortified Forest | 27%(2448/8828) | 2021-1-21 |
| 1874 | Trade on Verweggistan | 28%(560/1950) | 2020-10-3 |
| 1875 | Robot | 22%(63/274) | 2019-12-8 |
| 1876 | The Letter Carrier's Rounds | 29%(121/414) | 2020-9-24 |
| 1877 | Flooded! | 28%(2353/8355) | 2021-1-23 |
| 1878 | Jill's Bike | 25%(382/1494) | 2020-6-10 |
| 1879 | Tempus et mobilius Time and motion | 58%(542/928) | 2020-3-17 |
| 1880 | Variable Radix Huffman Encoding | 27%(260/943) | 2020-6-11 |
| 1881 | Sail Race | 19%(19/96) | 2019-3-27 |
| 1882 | Stamps | 33%(576/1700) | 2020-11-23 |
| 1883 | Theseus and the Minotaur | 11%(28/249) | 2019-5-17 |
| 1884 | Train Time | 8%(40/465) | 2019-6-14 |
| 1885 | Uncompress | 34%(351/1020) | 2020-11-14 |
| 1886 | Borrowers | 24%(387/1612) | 2020-9-25 |
| 1887 | Testing the CATCHER | 36%(7212/19644) | 2021-1-16 |
| 1888 | Crossword Answers | 41%(618/1481) | 2020-12-4 |
| 1889 | Package Pricing | 10%(53/520) | 2019-10-11 |
| 1890 | Switching Channels | 51%(250/487) | 2020-4-13 |
| 1891 | Typesetting | 10%(35/332) | 2019-6-12 |
| 1892 | VTAS - Vessel Traffic Advisory Service | 1%(3/188) | 2019-5-16 |
| 1893 | Monitoring Wheelchair Patients | 17%(78/452) | 2019-9-25 |
| 1894 | Alternative Scale of Notation | 37%(826/2214) | 2020-8-27 |
| 1895 | Bring Them There | 27%(281/1028) | 2021-1-11 |
| 1896 | Code Formatting | 34%(546/1587) | 2020-9-27 |
| 1897 | Data Mining | 25%(108/426) | 2020-10-19 |
| 1898 | Entropy | 22%(216/973) | 2020-4-18 |
| 1899 | Farmer Bill's Problem | 26%(673/2579) | 2019-9-25 |
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