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Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

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  • AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
  • AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
  • AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
  • AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
  • USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
  • Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
  • AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
  • DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
  • USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
24997 Codeforces 1941E: Rudolf and k Bridges
24996 Codeforces 1941D: Rudolf and the Ball Game
24995 Codeforces 1941C: Rudolf and the Ugly String
24994 Codeforces 1941B: Rudolf and 121
24993 Codeforces 1941A: Rudolf and the Ticket
24992 Codeforces 1940D: Almost Certainly
24991 Codeforces 1940C: Burenka and Pether
24990 Codeforces 1940B: Three Arrays
24989 Codeforces 1940A: Parallel Universes
24988 Codeforces 1939D: Big Persimmon
24987 Codeforces 1939C: More Gifts
24986 Codeforces 1939B: Evidence Board
24985 Codeforces 1939A: Draw Polygon Lines
24984 Codeforces 1938M: Zig-zag
24983 Codeforces 1938L: XOR Operations
24982 Codeforces 1938K: Tree Quiz
24981 Codeforces 1938J: There and Back Again
24980 Codeforces 1938I: Symmetric Boundary
24979 Codeforces 1938H: Pho Restaurant
24978 Codeforces 1938G: Personality Test
24977 Codeforces 1938F: Forming Groups
24976 Codeforces 1938E: Duplicates
24975 Codeforces 1938D: Bánh Bò
24974 Codeforces 1938C: Bit Counting Sequence
24973 Codeforces 1938B: Attraction Score
24972 Codeforces 1938A: Antiparticle Antiphysics
24971 Codeforces 1937B: Binary Path
24970 Codeforces 1937A: Shuffle Party
24969 Codeforces 1936F: Grand Finale: Circles
24968 Codeforces 1936E: Yet Yet Another Permutation Problem
24967 Codeforces 1936D: Bitwise Paradox
24966 Codeforces 1936C: Pokémon Arena
24965 Codeforces 1936B: Pinball
24964 Codeforces 1936A: Bitwise Operation Wizard
24963 Codeforces 1935F: Andrey's Tree
24962 Codeforces 1935E: Distance Learning Courses in MAC
24961 Codeforces 1935D: Exam in MAC
24960 Codeforces 1935C: Messenger in MAC
24959 Codeforces 1935B: Informatics in MAC
24958 Codeforces 1935A: Entertainment in MAC
24957 Codeforces 1934E: Weird LCM Operations
24956 Codeforces 1934D2: XOR Break --- Game Version
24955 Codeforces 1934D1: XOR Break --- Solo Version
24954 Codeforces 1934C: Find a Mine
24953 Codeforces 1934B: Yet Another Coin Problem
24952 Codeforces 1934A: Too Min Too Max
24951 Codeforces 1933G: Turtle Magic: Royal Turtle Shell Pattern
24950 Codeforces 1933F: Turtle Mission: Robot and the Earthquake
24949 Codeforces 1933E: Turtle vs. Rabbit Race: Optimal Trainings
24948 Codeforces 1933D: Turtle Tenacity: Continual Mods
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