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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)
8955 AtCoder ABC020: C. 壁抜け
8954 AtCoder ABC020: B. 足し算
8953 AtCoder ABC020: A. クイズ
8952 AtCoder ABC019: D. 高橋くんと木の直径
8951 AtCoder ABC019: C. 高橋くんと魔法の箱
8950 AtCoder ABC019: B. 高橋くんと文字列圧縮
8949 AtCoder ABC019: A. 高橋くんと年齢
8948 AtCoder ABC018: D. バレンタインデー
8947 AtCoder ABC018: C. 菱型カウント
8946 AtCoder ABC018: B. 文字列の反転
8945 AtCoder ABC018: A. 豆まき
8944 AtCoder ABC017: D. サプリメント
8943 AtCoder ABC017: C. ハイスコア
8942 AtCoder ABC017: B. choku語
8941 AtCoder ABC017: A. プロコン
8940 AtCoder ABC016: D. 一刀両断
8939 AtCoder ABC016: C. 友達の友達
8938 AtCoder ABC016: B. A±B Problem
8937 AtCoder ABC016: A. 12月6日
8936 AtCoder ABC015: D. 高橋くんの苦悩
8935 AtCoder ABC015: C. 高橋くんのバグ探し
8934 AtCoder ABC015: B. 高橋くんの集計
8933 AtCoder ABC015: A. 高橋くんの研修
8932 AtCoder ABC014: D. 閉路
8931 AtCoder ABC014: C. AtColor
8930 AtCoder ABC014: B. 価格の合計
8929 AtCoder ABC014: A. けんしょう先生のお菓子配り
8928 AtCoder ABC013: D. 阿弥陀
8927 AtCoder ABC013: C. 節制
8926 AtCoder ABC013: B. 錠
8925 AtCoder ABC013: A. A
8924 AtCoder ABC012: D. バスと避けられない運命
8923 AtCoder ABC012: C. 九九足し算
8922 AtCoder ABC012: B. 入浴時間
8921 AtCoder ABC012: A. スワップ
8920 AtCoder ABC011: D. 大ジャンプ
8919 AtCoder ABC011: C. 123引き算
8918 AtCoder ABC011: B. 名前の確認
8917 AtCoder ABC011: A. 来月は何月？
8916 AtCoder ABC010: D. 浮気予防
8915 AtCoder ABC010: C. 浮気調査
8914 AtCoder ABC010: B. 花占い
8913 AtCoder ABC010: A. ハンドルネーム
8912 AtCoder ABC009: D. 漸化式
8911 AtCoder ABC009: C. 辞書式順序ふたたび
8910 AtCoder ABC009: B. 心配性な富豪、ファミリーレストランに行く。
8909 AtCoder ABC009: A. 引越し作業
8908 AtCoder ABC008: D. 金塊ゲーム
8907 AtCoder ABC008: C. コイン
8906 AtCoder ABC008: B. 投票
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