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)
8001	Codeforces 1718A2: Burenka and Traditions (hard version)
8000	Codeforces 1718A1: Burenka and Traditions (easy version)
7999	Codeforces 1717F: Madoka and The First Session
7998	Codeforces 1717E: Madoka and The Best University
7997	Codeforces 1717D: Madoka and The Corruption Scheme
7996	Codeforces 1717C: Madoka and Formal Statement
7995	Codeforces 1717B: Madoka and Underground Competitions
7994	Codeforces 1717A: Madoka and Strange Thoughts
7993	Codeforces 1716F: Bags with Balls
7992	Codeforces 1716E: Swap and Maximum Block
7991	Codeforces 1716D: Chip Move
7990	Codeforces 1716C: Robot in a Hallway
7989	Codeforces 1716B: Permutation Chain
7988	Codeforces 1716A: 2-3 Moves
7987	Codeforces 1715F: Crop Squares
7986	Codeforces 1715E: Long Way Home
7985	Codeforces 1715D: 2+ doors
7984	Codeforces 1715C: Monoblock
7983	Codeforces 1715B: Beautiful Array
7982	Codeforces 1715A: Crossmarket
7981	Codeforces 1714G: Path Prefixes
7980	Codeforces 1714F: Build a Tree and That Is It
7979	Codeforces 1714E: Add Modulo 10
7978	Codeforces 1714D: Color with Occurrences
7977	Codeforces 1714C: Minimum Varied Number
7976	Codeforces 1714B: Remove Prefix
7975	Codeforces 1714A: Everyone Loves to Sleep
7974	Codeforces 1713F: Lost Array
7973	Codeforces 1713E: Cross Swapping
7972	Codeforces 1713D: Tournament Countdown
7971	Codeforces 1713C: Build Permutation
7970	Codeforces 1713B: Optimal Reduction
7969	Codeforces 1713A: Traveling Salesman Problem
7968	Codeforces 1712F: Triameter
7967	Codeforces 1712E2: LCM Sum (hard version)
7966	Codeforces 1712E1: LCM Sum (easy version)
7965	Codeforces 1712D: Empty Graph
7964	Codeforces 1712C: Sort Zero
7963	Codeforces 1712B: Woeful Permutation
7962	Codeforces 1712A: Wonderful Permutation
7961	Codeforces 1711B: Party
7960	Codeforces 1711A: Perfect Permutation
7959	Codeforces 1710E: Two Arrays
7958	Codeforces 1710D: Recover the Tree
7957	Codeforces 1710C: XOR Triangle
7956	Codeforces 1710B: Rain
7955	Codeforces 1710A: Color the Picture
7954	Codeforces 1709F: Multiset of Strings
7953	Codeforces 1709E: XOR Tree
7952	Codeforces 1709D: Rorororobot

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

8001

Codeforces 1718A2: Burenka and Traditions (hard version)

8000

Codeforces 1718A1: Burenka and Traditions (easy version)

7999

Codeforces 1717F: Madoka and The First Session

7998

Codeforces 1717E: Madoka and The Best University

7997

Codeforces 1717D: Madoka and The Corruption Scheme

7996