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)
10001	AtCoder ABC237: A. Not Overflow
10000	AtCoder ABC236: Ex. Distinct Multiples
9999	AtCoder ABC236: G. Good Vertices
9998	AtCoder ABC236: F. Spices
9997	AtCoder ABC236: E. Average and Median
9996	AtCoder ABC236: D. Dance
9995	AtCoder ABC236: C. Route Map
9994	AtCoder ABC236: B. Who is missing?
9993	AtCoder ABC236: A. chukodai
9992	AtCoder ABC235: Ex. Painting Weighted Graph
9991	AtCoder ABC235: G. Gardens
9990	AtCoder ABC235: F. Variety of Digits
9989	AtCoder ABC235: E. MST + 1
9988	AtCoder ABC235: D. Multiply and Rotate
9987	AtCoder ABC235: C. The Kth Time Query
9986	AtCoder ABC235: B. Climbing Takahashi
9985	AtCoder ABC235: A. Rotate
9984	AtCoder ABC234: Ex. Enumerate Pairs
9983	AtCoder ABC234: G. Divide a Sequence
9982	AtCoder ABC234: F. Reordering
9981	AtCoder ABC234: E. Arithmetic Number
9980	AtCoder ABC234: D. Prefix K-th Max
9979	AtCoder ABC234: C. Happy New Year!
9978	AtCoder ABC234: B. Longest Segment
9977	AtCoder ABC234: A. Weird Function
9976	AtCoder ABC233: Ex. Manhattan Christmas Tree
9975	AtCoder ABC233: G. Strongest Takahashi
9974	AtCoder ABC233: F. Swap and Sort
9973	AtCoder ABC233: E. Σ[k=0..10^100]floor(X／10^k)
9972	AtCoder ABC233: D. Count Interval
9971	AtCoder ABC233: C. Product
9970	AtCoder ABC233: B. A Reverse
9969	AtCoder ABC233: A. 10yen Stamp
9968	AtCoder ABC232: H. King's Tour
9967	AtCoder ABC232: G. Modulo Shortest Path
9966	AtCoder ABC232: F. Simple Operations on Sequence
9965	AtCoder ABC232: E. Rook Path
9964	AtCoder ABC232: D. Weak Takahashi
9963	AtCoder ABC232: C. Graph Isomorphism
9962	AtCoder ABC232: B. Caesar Cipher
9961	AtCoder ABC232: A. QQ solver
9960	AtCoder ABC231: H. Minimum Coloring
9959	AtCoder ABC231: G. Balls in Boxes
9958	AtCoder ABC231: F. Jealous Two
9957	AtCoder ABC231: E. Minimal payments
9956	AtCoder ABC231: D. Neighbors
9955	AtCoder ABC231: C. Counting 2
9954	AtCoder ABC231: B. Election
9953	AtCoder ABC231: A. Water Pressure
9952	AtCoder ABC230: H. Bullion

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

10001

AtCoder ABC237: A. Not Overflow

10000

AtCoder ABC236: Ex. Distinct Multiples

9999

AtCoder ABC236: G. Good Vertices

9998

AtCoder ABC236: F. Spices

9997

AtCoder ABC236: E. Average and Median

9996