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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)
13990 AtCoder PAST202203-OPEN: I. Symmetric Transformation
13989 AtCoder PAST202203-OPEN: H. Connected Components
13988 AtCoder PAST202203-OPEN: G. Equations
13987 AtCoder PAST202203-OPEN: F. Coloring map
13986 AtCoder PAST202203-OPEN: E. Only 2 kinds
13985 AtCoder PAST202203-OPEN: D. High Score
13984 AtCoder PAST202203-OPEN: C. Go Further
13983 AtCoder PAST202203-OPEN: B. Flowers
13982 AtCoder PAST202203-OPEN: A. Three cards
13981 AtCoder PAST202112-OPEN: O. Pair Score
13980 AtCoder PAST202112-OPEN: N. Intersection
13979 AtCoder PAST202112-OPEN: M. Deadnames
13978 AtCoder PAST202112-OPEN: L. Honest students
13977 AtCoder PAST202112-OPEN: K. Gas Station
13976 AtCoder PAST202112-OPEN: J. Rotate and Reverse
13975 AtCoder PAST202112-OPEN: I. Direct Elevator
13974 AtCoder PAST202112-OPEN: H. Longest Non-common Subsequence
13973 AtCoder PAST202112-OPEN: G. Connectivity
13972 AtCoder PAST202112-OPEN: F. Like As Shogi
13971 AtCoder PAST202112-OPEN: E. Keyboard
13970 AtCoder PAST202112-OPEN: D. Examination
13969 AtCoder PAST202112-OPEN: C. Fastest Answer
13968 AtCoder PAST202112-OPEN: B. Perforated Coin
13967 AtCoder PAST202112-OPEN: A. Attractions
13966 AtCoder PAST202109-OPEN: O. Red Blue Tournament
13965 AtCoder PAST202109-OPEN: N. Zigzag Sequences
13964 AtCoder PAST202109-OPEN: M. Balance
13963 AtCoder PAST202109-OPEN: L. K-th Abs
13962 AtCoder PAST202109-OPEN: K. Happy Wedding!
13961 AtCoder PAST202109-OPEN: J. Reverse Array
13960 AtCoder PAST202109-OPEN: I. /2 and *3
13959 AtCoder PAST202109-OPEN: H. Shortest Path
13958 AtCoder PAST202109-OPEN: G. K-th element
13957 AtCoder PAST202109-OPEN: F. Incomplete Permutation
13956 AtCoder PAST202109-OPEN: E. Colorful T-Shirts
13955 AtCoder PAST202109-OPEN: D. Divisor
13954 AtCoder PAST202109-OPEN: C. Number of Apperance
13953 AtCoder PAST202109-OPEN: B. intersection
13952 AtCoder PAST202109-OPEN: A. Bubbler
13951 AtCoder PAST202107-OPEN: O. Computer
13950 AtCoder PAST202107-OPEN: N. Monochrome Design
13949 AtCoder PAST202107-OPEN: M. Divide
13948 AtCoder PAST202107-OPEN: L. Multiple Min Query
13947 AtCoder PAST202107-OPEN: K. Flying Trip
13946 AtCoder PAST202107-OPEN: J. Never Ending Journey
13945 AtCoder PAST202107-OPEN: I. Nevus
13944 AtCoder PAST202107-OPEN: H. Line Chart
13943 AtCoder PAST202107-OPEN: G. Power Expression
13942 AtCoder PAST202107-OPEN: F. Double Booking
13941 AtCoder PAST202107-OPEN: E. Aoki's Trick
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