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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)
13205 AtCoder JOISC2017: F. 鉄道旅行 (Railway Trip)
13204 AtCoder JOISC2017: E. 壊れた機器 (Broken Device)
13203 AtCoder JOISC2017: D. 切符の手配 (Arranging Tickets)
13202 AtCoder JOISC2017: C. 手持ち花火 (Sparklers)
13201 AtCoder JOISC2017: B. 港湾設備 (Port Facility)
13200 AtCoder JOISC2017: A. 開拓 (Cultivation)
13199 AtCoder JOISC2016: L. 最悪の記者2
13198 AtCoder JOISC2016: K. 雪降る道路
13197 AtCoder JOISC2016: J. 危険なスケート
13196 AtCoder JOISC2016: I. 電報
13195 AtCoder JOISC2016: H. 回転寿司
13194 AtCoder JOISC2016: G. ダンジョン2
13193 AtCoder JOISC2016: F. トイレ
13192 AtCoder JOISC2016: E. サンドイッチ
13191 AtCoder JOISC2016: D. 雇用計画
13190 AtCoder JOISC2016: C. ソリティア
13189 AtCoder JOISC2016: B. 神経衰弱
13188 AtCoder JOISC2016: A. マトリョーシカ人形
13187 AtCoder JOISC2015: M. 防壁
13186 AtCoder JOISC2015: L. 記憶縛り
13185 AtCoder JOISC2015: K. 遺産相続
13184 AtCoder JOISC2015: J. 道案内
13183 AtCoder JOISC2015: I. とてもたのしいカードゲーム
13182 AtCoder JOISC2015: H. AAQQZ
13181 AtCoder JOISC2015: G. 道路整備
13180 AtCoder JOISC2015: F. 合鍵
13179 AtCoder JOISC2015: E. ビルの飾りつけ 3
13178 AtCoder JOISC2015: D. IOIOI カード占い
13177 AtCoder JOISC2015: C. たのしいたのしい家庭菜園
13176 AtCoder JOISC2015: B. 愉快なロゴデザイン
13175 AtCoder JOISC2015: A. コピー&ペースト 2
13174 AtCoder JOISC2014: M. ストラップ
13173 AtCoder JOISC2014: L. 漢字しりとり
13172 AtCoder JOISC2014: K. 二人の星座
13171 AtCoder JOISC2014: J. 電圧
13170 AtCoder JOISC2014: I. かかし
13169 AtCoder JOISC2014: H. JOIOJI
13168 AtCoder JOISC2014: G. スタンプラリー
13167 AtCoder JOISC2014: F. 友だちをつくろう
13166 AtCoder JOISC2014: E. 水筒
13165 AtCoder JOISC2014: D. ラーメンの食べ比べ
13164 AtCoder JOISC2014: C. 歴史の研究
13163 AtCoder JOISC2014: B. たのしい家庭菜園
13162 AtCoder JOISC2014: A. バス通学
13161 AtCoder JOISC2013-DAY2: 3. スパイ (Spy)
13160 AtCoder JOISC2013-DAY4: 3. 宇宙船 (Spaceships)
13159 AtCoder JOISC2013-DAY4: 2. プレゼント (Presents)
13158 AtCoder JOISC2013-DAY3: 3. 山岳救助隊 (Mountain Rescue Team)
13157 AtCoder JOISC2013-DAY4: 1. メッセンジャー (Messenger)
13156 AtCoder JOISC2013-DAY2: 2. マスコットの片付け (Mascots)
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