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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)
13005 AtCoder JOI2023YO2: A. 年齢の差 (Age Difference)
13004 AtCoder JOI2023YO1C: D. マラソン大会 (Marathon Race)
13003 AtCoder JOI2023YO1C: C. JOI エディタ (JOI Editor)
13002 AtCoder JOI2023YO1C: B. 11 月 (November)
13001 AtCoder JOI2023YO1C: A. 2 桁の整数 (Two-digit Integer)
13000 AtCoder JOI2023YO1B: D. 点数 (Score)
12999 AtCoder JOI2023YO1B: C. 繰り返し文字列 (Repeating String)
12998 AtCoder JOI2023YO1B: B. 三方比較 (Three-Way Comparison)
12997 AtCoder JOI2023YO1B: A. 時間 (Hour)
12996 AtCoder JOI2023YO1A: D. 二人三脚 (Three-Legged Race)
12995 AtCoder JOI2023YO1A: C. 3 つの箱 (Three Boxes)
12994 AtCoder JOI2023YO1A: B. ゾロ目 (Same Numbers)
12993 AtCoder JOI2023YO1A: A. 長方形 (Rectangle)
12992 AtCoder JOI2022HO: E. 砂の城 2 (Sandcastle 2)
12991 AtCoder JOI2022HO: D. 鉄道旅行 2 (Railway Trip 2)
12990 AtCoder JOI2022HO: C. 選挙で勝とう (Let's Win the Election)
12989 AtCoder JOI2022HO: B. 自習 (Self Study)
12988 AtCoder JOI2022HO: A. インターカステラー (Intercastellar)
12987 AtCoder JOI2022YO2: E. 交易計画 (Trade Plan)
12986 AtCoder JOI2022YO2: D. 飴 2 (Candies 2)
12985 AtCoder JOI2022YO2: C. 国土分割 (Land Division)
12984 AtCoder JOI2022YO2: B. カーペット (Carpet)
12983 AtCoder JOI2022YO2: A. 図書館 2 (Library 2)
12982 AtCoder JOI2022YO1C: D. ボールの移動 (Moving Balls)
12981 AtCoder JOI2022YO1C: C. 運動会 (Sports Day)
12980 AtCoder JOI2022YO1C: B. アイスクリーム (Ice Cream)
12979 AtCoder JOI2022YO1C: A. 身長 (Height)
12978 AtCoder JOI2022YO1B: D. 希少な数 (Rare Number)
12977 AtCoder JOI2022YO1B: C. 次の文字 (Next Character)
12976 AtCoder JOI2022YO1B: B. 短針 (Hour Hand)
12975 AtCoder JOI2022YO1B: A. 立方体 (Cube)
12974 AtCoder JOI2022YO1A: D. 箱と鍵 (Boxes and Keys)
12973 AtCoder JOI2022YO1A: C. 複雑な文字列 (Complex String)
12972 AtCoder JOI2022YO1A: B. 移動 (Moving)
12971 AtCoder JOI2022YO1A: A. 余り (Remainder)
12970 AtCoder JOI2021HO: E. ダンジョン 3 (Dungeon 3)
12969 AtCoder JOI2021HO: D. ロボット (Robot)
12968 AtCoder JOI2021HO: C. 集合写真 (Group Photo)
12967 AtCoder JOI2021HO: B. 雪玉 (Snowball)
12966 AtCoder JOI2021HO: A. とてもたのしい家庭菜園 (Growing Vegetables is Fun 4)
12965 AtCoder JOI2021YO2: E. スパイ 2 (Spy 2)
12964 AtCoder JOI2021YO2: D. 安全点検 (Safety Inspection)
12963 AtCoder JOI2021YO2: C. イベント巡り (Event Hopping)
12962 AtCoder JOI2021YO2: B. パンケーキ (Pancake)
12961 AtCoder JOI2021YO2: A. 往復すごろく (Round Sugoroku)
12960 AtCoder JOI2021YO1C: C. 比較 (Comparison)
12959 AtCoder JOI2021YO1C: B. IOI 文字列 (IOI String)
12958 AtCoder JOI2021YO1C: A. 計算 (Calculation)
12957 AtCoder JOI2021YO1B: C. 分割 (Split)
12956 AtCoder JOI2021YO1B: B. ビ太郎と IOI (Bitaro and IOI)
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