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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 |
| 4000 | National Treasures | 25%(274/1091) | Oct 15, 2026 |
| 4001 | Xiangqi | 23%(656/2808) | Oct 15, 2026 |
| 4002 | Alice's mooncake shop | 29%(367/1225) | Oct 15, 2026 |
| 4003 | Bob’s Race | 27%(298/1068) | Oct 15, 2026 |
| 4004 | My World Cup | 18%(23/127) | Oct 16, 2026 |
| 4005 | Moles | 14%(108/764) | Oct 16, 2026 |
| 4006 | Genghis Khan the Conqueror | 31%(172/541) | Oct 16, 2026 |
| 4007 | Flood-it! | 35%(295/838) | Oct 15, 2026 |
| 4008 | Running relay | 16%(59/358) | Oct 16, 2026 |
| 4009 | Porcelain Exhibitions | 15%(25/158) | Oct 16, 2026 |
| 4010 | Shadow | 27%(52/189) | Oct 16, 2026 |
| 4011 | Automated Telephone Exchange | 52%(1129/2169) | Oct 15, 2026 |
| 4012 | Black Square | 18%(265/1458) | Oct 21, 2026 |
| 4013 | Cube Coloring | 4%(14/285) | Oct 16, 2026 |
| 4014 | Dice | 35%(455/1297) | Oct 21, 2026 |
| 4015 | Electrification | 3%(4/123) | Oct 16, 2026 |
| 4016 | Flat | 39%(322/819) | Oct 21, 2026 |
| 4017 | Galaxy Interconnection | 4%(4/88) | Oct 16, 2026 |
| 4018 | High security | 26%(101/381) | Oct 16, 2026 |
| 4019 | Immediate Delivery | 37%(74/197) | Oct 21, 2026 |
| 4020 | John's Inversions | 31%(231/731) | Oct 16, 2026 |
| 4021 | Kids Like Cakes | 7%(28/364) | Oct 21, 2026 |
| 4022 | ASCII Area | 46%(374/813) | Oct 15, 2026 |
| 4023 | Binary Encoding | 42%(165/384) | Oct 16, 2026 |
| 4024 | Caption | 7%(7/90) | Oct 16, 2026 |
| 4025 | Dictionary Size | 17%(95/542) | Oct 16, 2026 |
| 4026 | Eve | 27%(109/392) | Oct 16, 2026 |
| 4027 | Flights | 0%(0/126) | Oct 21, 2026 |
| 4028 | GCD Guessing Game | 39%(162/410) | Oct 21, 2026 |
| 4029 | Huzita Axiom 6 | 0%(0/72) | Oct 16, 2026 |
| 4031 | Journey | 2%(22/931) | Oct 21, 2026 |
| 4032 | Kingdom Roadmap | 0%(0/292) | Oct 21, 2026 |
| 4033 | Lanes | 7%(8/114) | Oct 16, 2026 |
| 4034 | Alphabet Soup | 25%(24/94) | Oct 21, 2026 |
| 4035 | Coin Collecting | 4%(5/116) | Oct 21, 2026 |
| 4036 | Cybercrime Donut Investigation | 2%(7/259) | Oct 21, 2026 |
| 4037 | Distributing Ballot Boxes | 11%(37/327) | Oct 16, 2026 |
| 4038 | Game, Set and Match | 34%(22/63) | Oct 16, 2026 |
| 4039 | Guess the Numbers | 26%(60/225) | Oct 16, 2026 |
| 4040 | Non-negative Partial Sums | 11%(44/396) | Oct 16, 2026 |
| 4041 | Peer Review | 43%(52/119) | Oct 16, 2026 |
| 4042 | Regular Convex Polygon | 35%(60/168) | Oct 16, 2026 |
| 4043 | Remoteland | 27%(74/273) | Oct 16, 2026 |
| 4044 | Score Sequence | 39%(675/1694) | Oct 15, 2026 |
| 4045 | Power Station | 40%(719/1770) | Oct 15, 2026 |
| 4046 | Sightseeing | 22%(682/3081) | Oct 15, 2026 |
| 4047 | Garden | 37%(684/1837) | Oct 15, 2026 |
| 4048 | Chinese Repeating Crossbow | 29%(417/1407) | Oct 15, 2026 |
| 4049 | Chess | 22%(237/1031) | Oct 15, 2026 |
| 4050 | Necklace | 15%(58/367) | Oct 15, 2026 |
| 4051 | Aeroplane Chess | 19%(47/243) | Oct 21, 2026 |
| 4052 | Hrinity | 26%(605/2314) | Oct 21, 2026 |
| 4053 | World of Goo | 6%(9/150) | Oct 21, 2026 |
| 4054 | KINA Is Not Abbreviation | 2%(9/359) | Oct 21, 2026 |
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