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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 |
| 3000 | Frogger | 28%(338/1193) | Nov 24, 2025 |
| 3001 | Gallup | 46%(277/592) | Dec 10, 2025 |
| 3002 | Jackpot | 33%(1545/4651) | Nov 20, 2025 |
| 3003 | Spiderman’s workout | 38%(767/1987) | Jan 7, 2026 |
| 3004 | Subway planning | 28%(432/1541) | Dec 10, 2025 |
| 3005 | Exploding CPU | 42%(232/546) | Dec 10, 2025 |
| 3006 | Dirichlet's Theorem on Arithmetic Progressions | 48%(11619/23744) | Jan 7, 2026 |
| 3007 | Organize Your Train part II | 28%(2712/9663) | Dec 22, 2025 |
| 3008 | Hexerpents of Hexwamp | 30%(102/337) | Dec 10, 2025 |
| 3009 | Curling 2.0 | 40%(17643/43156) | Jan 7, 2026 |
| 3010 | The Genome Database of All Space Life | 29%(258/878) | Jan 8, 2026 |
| 3011 | Secrets in Shadows | 21%(87/397) | Dec 10, 2025 |
| 3012 | A Number from Yanghui Triangle | 41%(1005/2417) | Jan 8, 2026 |
| 3013 | Big Christmas Tree | 21%(6624/30914) | Jan 9, 2026 |
| 3014 | Cake Pieces and Plates | 31%(2208/6947) | Nov 20, 2025 |
| 3015 | Expected Difference | 26%(399/1504) | Jan 8, 2026 |
| 3016 | K-Monotonic | 34%(519/1494) | Jan 8, 2026 |
| 3017 | Cut the Sequence | 30%(4864/16028) | Jan 5, 2026 |
| 3018 | Giftbox | 28%(1151/4071) | Jan 10, 2026 |
| 3019 | Image Rotation | 29%(38/130) | Dec 10, 2025 |
| 3020 | Antenna Placement | 48%(6641/13694) | Jan 4, 2026 |
| 3021 | e-Coins | 48%(435/892) | Jan 8, 2026 |
| 3022 | The Uxuhul Voting System | 45%(179/394) | Jan 7, 2026 |
| 3023 | Submarines | 42%(175/411) | Nov 20, 2025 |
| 3024 | The Gossiping System | 36%(138/378) | Jan 8, 2026 |
| 3025 | Rings | 34%(407/1176) | Jan 8, 2026 |
| 3026 | Borg Maze | 31%(7872/25388) | Jan 8, 2026 |
| 3027 | Base equality | 60%(560/924) | Nov 20, 2025 |
| 3028 | Shoot-out | 29%(317/1075) | Dec 10, 2025 |
| 3029 | Tour Guide | 35%(341/949) | Dec 10, 2025 |
| 3030 | Nasty Hacks | 69%(10044/14534) | Jan 8, 2026 |
| 3031 | Jezzball | 34%(40/117) | Dec 10, 2025 |
| 3032 | Card Trick | 68%(3549/5214) | Nov 24, 2025 |
| 3033 | Traveling Salesman | 37%(173/458) | Nov 26, 2025 |
| 3034 | Whac-a-Mole | 29%(1299/4369) | Dec 10, 2025 |
| 3035 | Random Walking | 31%(281/889) | Nov 24, 2025 |
| 3036 | Honeycomb Walk | 66%(1789/2683) | Nov 20, 2025 |
| 3037 | Skiing | 25%(1835/7216) | Jan 7, 2026 |
| 3038 | Flying Right | 33%(855/2589) | Jan 8, 2026 |
| 3039 | Close Encounter | 37%(1344/3632) | Jan 7, 2026 |
| 3040 | Allowance | 42%(5219/12322) | Dec 13, 2025 |
| 3041 | Asteroids | 53%(18359/34582) | Jan 8, 2026 |
| 3042 | Grazing on the Run | 41%(1223/2978) | Nov 24, 2025 |
| 3043 | Walk the Talk | 41%(270/652) | Dec 10, 2025 |
| 3044 | City Skyline | 44%(1706/3875) | Jan 7, 2026 |
| 3045 | Cow Acrobats | 36%(4100/11330) | Jan 8, 2026 |
| 3046 | Ant Counting | 37%(4460/11994) | Jan 9, 2026 |
| 3047 | Bovine Birthday | 44%(1114/2516) | Jan 8, 2026 |
| 3048 | Max Factor | 36%(3839/10510) | Jan 8, 2026 |
| 3049 | Securing the Barn | 62%(1526/2428) | Jan 7, 2026 |
| 3050 | Hopscotch | 62%(6139/9824) | Jan 8, 2026 |
| 3051 | Satellite Photographs | 45%(3062/6672) | Jan 7, 2026 |
| 3052 | Geodes | 30%(49/160) | Dec 10, 2025 |
| 3053 | Bowling | 25%(245/952) | Jan 8, 2026 |
| 3054 | High Spies | 26%(37/142) | Dec 10, 2025 |
| 3055 | Digital Friends | 45%(550/1200) | Dec 3, 2025 |
| 3056 | The Bavarian Beer Party | 38%(488/1284) | Nov 20, 2025 |
| 3057 | Evacuation | 25%(1564/6037) | Jan 8, 2026 |
| 3058 | Decompression | 47%(293/614) | Jan 8, 2026 |
| 3059 | Rummikub | 34%(78/224) | Dec 1, 2025 |
| 3060 | Make it Manhattan | 40%(477/1180) | Nov 26, 2025 |
| 3061 | Subsequence | 38%(23461/61731) | Jan 9, 2026 |
| 3062 | Celebrity jeopardy | 56%(9800/17499) | Jan 7, 2026 |
| 3063 | Sherlock Holmes | 28%(259/895) | Jan 7, 2026 |
| 3064 | Payment System | 35%(69/194) | Dec 10, 2025 |
| 3065 | Stargates | 22%(555/2460) | Jan 8, 2026 |
| 3066 | Maximum | 57%(549/951) | Dec 10, 2025 |
| 3067 | Japan | 26%(11075/41834) | Jan 9, 2026 |
| 3068 | "Shortest" pair of paths | 49%(1134/2290) | Jan 8, 2026 |
| 3069 | Saruman's Army | 49%(14710/29879) | Dec 30, 2025 |
| 3070 | Fibonacci | 64%(22370/34784) | Dec 21, 2025 |
| 3071 | Football | 41%(4704/11307) | Jan 8, 2026 |
| 3072 | Robot | 33%(613/1819) | Jan 7, 2026 |
| 3073 | Spam | 56%(630/1120) | Jan 8, 2026 |
| 3074 | Sudoku | 34%(5168/14872) | Jan 8, 2026 |
| 3075 | Tic-Tac-Toe | 40%(922/2282) | Jan 8, 2026 |
| 3076 | Sudoku | 45%(3091/6760) | Jan 9, 2026 |
| 3077 | Rounders | 64%(5323/8261) | Nov 20, 2025 |
| 3078 | Q | 68%(1284/1874) | Jan 8, 2026 |
| 3079 | Enigmatologically Cruciverbalistic | 19%(126/661) | Jan 8, 2026 |
| 3080 | Blue Jeans | 43%(12155/27703) | Jan 8, 2026 |
| 3081 | Core Wars | 30%(69/224) | Jan 8, 2026 |
| 3082 | 'Roid Rage | 30%(303/984) | Nov 24, 2025 |
| 3083 | Children of the Candy Corn | 42%(7883/18696) | Jan 8, 2026 |
| 3084 | Panic Room | 51%(1224/2362) | Dec 10, 2025 |
| 3085 | Quick Change | 70%(4573/6479) | Jan 7, 2026 |
| 3086 | Triangular Sums | 69%(5716/8180) | Nov 20, 2025 |
| 3087 | Shuffle'm Up | 44%(11649/26063) | Jan 11, 2026 |
| 3088 | Push Botton Lock | 63%(1065/1690) | Nov 26, 2025 |
| 3089 | Sign Message Formatting | 19%(22/114) | Dec 10, 2025 |
| 3090 | Visible Lattice Points | 58%(7428/12739) | Dec 4, 2025 |
| 3091 | Triangular N-Queens Problem | 43%(399/913) | Nov 26, 2025 |
| 3092 | Non-divisible 2-3 Power Sums | 46%(526/1128) | Dec 10, 2025 |
| 3093 | Margaritas on the River Walk | 37%(1275/3356) | Jan 8, 2026 |
| 3094 | Quicksum | 66%(14469/21917) | Jan 4, 2026 |
| 3095 | Linear Pachinko | 69%(1197/1718) | Dec 10, 2025 |
| 3096 | Surprising Strings | 59%(5749/9742) | Jan 8, 2026 |
| 3097 | Falling Ice | 26%(109/419) | Oct 18, 2025 |
| 3098 | Frugal Search | 46%(498/1077) | Nov 24, 2025 |
| 3099 | Go Go Gorelians | 54%(586/1082) | Dec 21, 2025 |
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