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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)
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
13940 AtCoder PAST202107-OPEN: D. Replace
13939 AtCoder PAST202107-OPEN: C. Validation
13938 AtCoder PAST202107-OPEN: B. Vapor Pressure
13937 AtCoder PAST202107-OPEN: A. check digit
13936 AtCoder PAST202104-OPEN: O. Shortest Distance Query
13935 AtCoder PAST202104-OPEN: N. Activities
13934 AtCoder PAST202104-OPEN: M. Equal Queries
13933 AtCoder PAST202104-OPEN: L. Urban Planning
13932 AtCoder PAST202104-OPEN: K. Common Coupon
13931 AtCoder PAST202104-OPEN: J. Points to Cost
13930 AtCoder PAST202104-OPEN: I. PAST to Fishing
13929 AtCoder PAST202104-OPEN: H. Can Can Mart
13928 AtCoder PAST202104-OPEN: G. One Step at a Time
13927 AtCoder PAST202104-OPEN: F. Safety System
13926 AtCoder PAST202104-OPEN: E. Third from Front
13925 AtCoder PAST202104-OPEN: D. K Integers Summations
13924 AtCoder PAST202104-OPEN: C. Buying a Cellphone
13923 AtCoder PAST202104-OPEN: B. PASTal Code
13922 AtCoder PAST202104-OPEN: A. POSTal Code
13921 AtCoder PAST202012-OPEN: O. Notification
13920 AtCoder PAST202012-OPEN: N. Travel Agency
13919 AtCoder PAST202012-OPEN: M. Shipping Sticks
13918 AtCoder PAST202012-OPEN: L. Collecting T
13917 AtCoder PAST202012-OPEN: K. Pitching
13916 AtCoder PAST202012-OPEN: J. Long Long String
13915 AtCoder PAST202012-OPEN: I. Evacuation Plan
13914 AtCoder PAST202012-OPEN: H. Conveyor
13913 AtCoder PAST202012-OPEN: G. Snake
13912 AtCoder PAST202012-OPEN: F. Dangerous Chemicals
13911 AtCoder PAST202012-OPEN: E. Stamp
13910 AtCoder PAST202012-OPEN: D. Leading Zeros
13909 AtCoder PAST202012-OPEN: C. Hexatridecimal
13908 AtCoder PAST202012-OPEN: B. Overwrite
13907 AtCoder PAST202012-OPEN: A. OX Game
13906 AtCoder PAST202010-OPEN: O. 宝箱
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