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)
9651	AtCoder ABC187: A. Large Digits
9650	AtCoder ABC186: F. Rook on Grid
9649	AtCoder ABC186: E. Throne
9648	AtCoder ABC186: D. Sum of difference
9647	AtCoder ABC186: C. Unlucky 7
9646	AtCoder ABC186: B. Blocks on Grid
9645	AtCoder ABC186: A. Brick
9644	AtCoder ABC185: F. Range Xor Query
9643	AtCoder ABC185: E. Sequence Matching
9642	AtCoder ABC185: D. Stamp
9641	AtCoder ABC185: C. Duodecim Ferra
9640	AtCoder ABC185: B. Smartphone Addiction
9639	AtCoder ABC185: A. ABC Preparation
9638	AtCoder ABC184: F. Programming Contest
9637	AtCoder ABC184: E. Third Avenue
9636	AtCoder ABC184: D. increment of coins
9635	AtCoder ABC184: C. Super Ryuma
9634	AtCoder ABC184: B. Quizzes
9633	AtCoder ABC184: A. Determinant
9632	AtCoder ABC183: F. Confluence
9631	AtCoder ABC183: E. Queen on Grid
9630	AtCoder ABC183: D. Water Heater
9629	AtCoder ABC183: C. Travel
9628	AtCoder ABC183: B. Billiards
9627	AtCoder ABC183: A. ReLU
9626	AtCoder ABC182: F. Valid payments
9625	AtCoder ABC182: E. Akari
9624	AtCoder ABC182: D. Wandering
9623	AtCoder ABC182: C. To 3
9622	AtCoder ABC182: B. Almost GCD
9621	AtCoder ABC182: A. twiblr
9620	AtCoder ABC181: F. Silver Woods
9619	AtCoder ABC181: E. Transformable Teacher
9618	AtCoder ABC181: D. Hachi
9617	AtCoder ABC181: C. Collinearity
9616	AtCoder ABC181: B. Trapezoid Sum
9615	AtCoder ABC181: A. Heavy Rotation
9614	AtCoder ABC180: F. Unbranched
9613	AtCoder ABC180: E. Traveling Salesman among Aerial Cities
9612	AtCoder ABC180: D. Takahashi Unevolved
9611	AtCoder ABC180: C. Cream puff
9610	AtCoder ABC180: B. Various distances
9609	AtCoder ABC180: A. box
9608	AtCoder ABC179: F. Simplified Reversi
9607	AtCoder ABC179: E. Sequence Sum
9606	AtCoder ABC179: D. Leaping Tak
9605	AtCoder ABC179: C. A x B + C
9604	AtCoder ABC179: B. Go to Jail
9603	AtCoder ABC179: A. Plural Form
9602	AtCoder ABC178: F. Contrast

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

9651

AtCoder ABC187: A. Large Digits

9650

AtCoder ABC186: F. Rook on Grid

9649

AtCoder ABC186: E. Throne

9648

AtCoder ABC186: D. Sum of difference

9647

AtCoder ABC186: C. Unlucky 7

9646