Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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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)
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
13905	AtCoder PAST202010-OPEN: N. マス目の穴埋め
13904	AtCoder PAST202010-OPEN: M. 筆塗り
13903	AtCoder PAST202010-OPEN: L. マンションの改築
13902	AtCoder PAST202010-OPEN: K. 転倒数

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

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