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)
13601	AtCoder MUJIN-PC-2016: C. Orange Graph
13600	AtCoder MUJIN-PC-2016: B. Robot Arm
13599	AtCoder MUJIN-PC-2016: A. MUJIN
13598	AtCoder MONAMIEHB2021: E. Min Cost Sort
13597	AtCoder MONAMIEHB2021: D. Nice Couples
13596	AtCoder MONAMIEHB2021: C. Ball in the Box
13595	AtCoder MONAMIEHB2021: B. Lovely Sequence
13594	AtCoder MONAMIEHB2021: A. Crab or Shrimp
13593	AtCoder MAXIMUM-CUP-2018: H. Maxmin Tour
13592	AtCoder MAXIMUM-CUP-2018: G. Sparrow's trick
13591	AtCoder MAXIMUM-CUP-2018: F. 献立表制作
13590	AtCoder MAXIMUM-CUP-2018: E. Interrupt Array
13589	AtCoder MAXIMUM-CUP-2018: D. Many Go Round
13588	AtCoder MAXIMUM-CUP-2018: C. 嘘つきな天使たち
13587	AtCoder MAXIMUM-CUP-2018: B. 駆け抜けろ！埼大山車部！！
13586	AtCoder MAXIMUM-CUP-2018: A. フィギュアスケート界の貴公子埼大選手
13585	AtCoder MAXIMUM-CUP-2013: J. ALPHAのならび
13584	AtCoder MAXIMUM-CUP-2013: I. 実績: ヘビマスター
13583	AtCoder MAXIMUM-CUP-2013: H. さいたまの矛盾
13582	AtCoder MAXIMUM-CUP-2013: G. King's Ring Tower
13581	AtCoder MAXIMUM-CUP-2013: F. 3人の騎士と1匹の犬
13580	AtCoder MAXIMUM-CUP-2013: E. Alicia's Rare card Challenge
13579	AtCoder MAXIMUM-CUP-2013: D. 絆よりも恋人が大事
13578	AtCoder MAXIMUM-CUP-2013: C. 白蛇のお守り
13577	AtCoder MAXIMUM-CUP-2013: B. Working for the World
13576	AtCoder MAXIMUM-CUP-2013: A. 特別作戦
13575	AtCoder MATH-AND-ALGORITHM: 026. Coin Gacha
13574	AtCoder MATH-AND-ALGORITHM: 025. Jiro's Vacation
13573	AtCoder MATH-AND-ALGORITHM: 024. Answer Exam Randomly
13572	AtCoder MATH-AND-ALGORITHM: 023. Dice Expectation
13571	AtCoder MATH-AND-ALGORITHM: 022. Choose Cards 3
13570	AtCoder MATH-AND-ALGORITHM: 021. Combination Easy
13569	AtCoder MATH-AND-ALGORITHM: 020. Choose Cards 2
13568	AtCoder MATH-AND-ALGORITHM: 019. Choose Cards 1
13567	AtCoder MATH-AND-ALGORITHM: 018. Convenience Store 1
13566	AtCoder MATH-AND-ALGORITHM: 017. Least Common Multiple of N Integers
13565	AtCoder MATH-AND-ALGORITHM: 016. Greatest Common Divisor of N Integers
13564	AtCoder MATH-AND-ALGORITHM: 015. Greatest Common Divisor
13563	AtCoder MATH-AND-ALGORITHM: 014. Factorization
13562	AtCoder MATH-AND-ALGORITHM: 013. Divisor Enumeration
13561	AtCoder MATH-AND-ALGORITHM: 012. Primality Test
13560	AtCoder MATH-AND-ALGORITHM: 011. Print Prime Numbers
13559	AtCoder MATH-AND-ALGORITHM: 010. Factorial
13558	AtCoder MATH-AND-ALGORITHM: 009. Brute Force 2
13557	AtCoder MATH-AND-ALGORITHM: 008. Brute Force 1
13556	AtCoder MATH-AND-ALGORITHM: 007. Number of Multiples 1
13555	AtCoder MATH-AND-ALGORITHM: 006. Print 2N+3
13554	AtCoder MATH-AND-ALGORITHM: 005. Modulo 100
13553	AtCoder MATH-AND-ALGORITHM: 004. Product of 3 Integers
13552	AtCoder MATH-AND-ALGORITHM: 003. Sum of N Integers

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

13601

AtCoder MUJIN-PC-2016: C. Orange Graph

13600

AtCoder MUJIN-PC-2016: B. Robot Arm

13599

AtCoder MUJIN-PC-2016: A. MUJIN

13598

AtCoder MONAMIEHB2021: E. Min Cost Sort

13597

AtCoder MONAMIEHB2021: D. Nice Couples

13596