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.

Need help searching? Click for format/examples of problems

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)
8651	Codeforces 1826F: Fading into Fog
8650	Codeforces 1826E: Walk the Runway
8649	Codeforces 1826D: Running Miles
8648	Codeforces 1826C: Dreaming of Freedom
8647	Codeforces 1826B: Lunatic Never Content
8646	Codeforces 1826A: Trust Nobody
8645	Codeforces 1825B: LuoTianyi and the Table
8644	Codeforces 1825A: LuoTianyi and the Palindrome String
8643	Codeforces 1824E: LuoTianyi and Cartridge
8642	Codeforces 1824D: LuoTianyi and the Function
8641	Codeforces 1824C: LuoTianyi and XOR-Tree
8640	Codeforces 1824B2: LuoTianyi and the Floating Islands (Hard Version)
8639	Codeforces 1824B1: LuoTianyi and the Floating Islands (Easy Version)
8638	Codeforces 1824A: LuoTianyi and the Show
8637	Codeforces 1823F: Random Walk
8636	Codeforces 1823E: Removing Graph
8635	Codeforces 1823D: Unique Palindromes
8634	Codeforces 1823C: Strongly Composite
8633	Codeforces 1823B: Sort with Step
8632	Codeforces 1823A: A-characteristic
8631	Codeforces 1822G2: Magic Triples (Hard Version)
8630	Codeforces 1822G1: Magic Triples (Easy Version)
8629	Codeforces 1822F: Gardening Friends
8628	Codeforces 1822E: Making Anti-Palindromes
8627	Codeforces 1822D: Super-Permutation
8626	Codeforces 1822C: Bun Lover
8625	Codeforces 1822B: Karina and Array
8624	Codeforces 1822A: TubeTube Feed
8623	Codeforces 1821F: Timber
8622	Codeforces 1821E: Rearrange Brackets
8621	Codeforces 1821D: Black Cells
8620	Codeforces 1821C: Tear It Apart
8619	Codeforces 1821B: Sort the Subarray
8618	Codeforces 1821A: Matching
8617	Codeforces 1820B: JoJo's Incredible Adventures
8616	Codeforces 1820A: Yura's New Name
8615	Codeforces 1819F: Willy-nilly, Crack, Into Release!
8614	Codeforces 1819E: Roads in E City
8613	Codeforces 1819D: Misha and Apples
8612	Codeforces 1819C: The Fox and the Complete Tree Traversal
8611	Codeforces 1819B: The Butcher
8610	Codeforces 1819A: Constructive Problem
8609	Codeforces 1818B: Indivisible
8608	Codeforces 1818A: Politics
8607	Codeforces 1817F: Entangled Substrings
8606	Codeforces 1817E: Half-sum
8605	Codeforces 1817D: Toy Machine
8604	Codeforces 1817C: Similar Polynomials
8603	Codeforces 1817B: Fish Graph
8602	Codeforces 1817A: Almost Increasing Subsequence

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

8651

Codeforces 1826F: Fading into Fog

8650

Codeforces 1826E: Walk the Runway

8649

Codeforces 1826D: Running Miles

8648

Codeforces 1826C: Dreaming of Freedom

8647

Codeforces 1826B: Lunatic Never Content

8646