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)
5701	Codeforces 1284A: New Year and Naming
5700	Codeforces 1283F: DIY Garland
5699	Codeforces 1283E: New Year Parties
5698	Codeforces 1283D: Christmas Trees
5697	Codeforces 1283C: Friends and Gifts
5696	Codeforces 1283B: Candies Division
5695	Codeforces 1283A: Minutes Before the New Year
5694	Codeforces 1282E: The Cake Is a Lie
5693	Codeforces 1282D: Enchanted Artifact
5692	Codeforces 1282C: Petya and Exam
5691	Codeforces 1282B2: K for the Price of One (Hard Version)
5690	Codeforces 1282B1: K for the Price of One (Easy Version)
5689	Codeforces 1282A: Temporarily unavailable
5688	Codeforces 1281B: Azamon Web Services
5687	Codeforces 1281A: Suffix Three
5686	Codeforces 1280F: Intergalactic Sliding Puzzle
5685	Codeforces 1280E: Kirchhoff's Current Loss
5684	Codeforces 1280D: Miss Punyverse
5683	Codeforces 1280C: Jeremy Bearimy
5682	Codeforces 1280B: Beingawesomeism
5681	Codeforces 1280A: Cut and Paste
5680	Codeforces 1279F: New Year and Handle Change
5679	Codeforces 1279E: New Year Permutations
5678	Codeforces 1279D: Santa's Bot
5677	Codeforces 1279C: Stack of Presents
5676	Codeforces 1279B: Verse For Santa
5675	Codeforces 1279A: New Year Garland
5674	Codeforces 1278F: Cards
5673	Codeforces 1278E: Tests for problem D
5672	Codeforces 1278D: Segment Tree
5671	Codeforces 1278C: Berry Jam
5670	Codeforces 1278B: A and B
5669	Codeforces 1278A: Shuffle Hashing
5668	Codeforces 1277D: Let's Play the Words?
5667	Codeforces 1277B: Make Them Odd
5666	Codeforces 1277A: Happy Birthday, Polycarp!
5665	Codeforces 1276F: Asterisk Substrings
5664	Codeforces 1276E: Four Stones
5663	Codeforces 1276D: Tree Elimination
5662	Codeforces 1276C: Beautiful Rectangle
5661	Codeforces 1276B: Two Fairs
5660	Codeforces 1276A: As Simple as One and Two
5659	Codeforces 1275F: Шардирование постов
5658	Codeforces 1275E3: Контрольная сумма
5657	Codeforces 1275E2: Контрольная сумма
5656	Codeforces 1275E1: Контрольная сумма
5655	Codeforces 1275D: Storage2
5654	Codeforces 1275C: #define Задача B ...
5653	Codeforces 1275B: Code Review
5652	Codeforces 1275A: Скрытый друг

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

5701

Codeforces 1284A: New Year and Naming

5700

Codeforces 1283F: DIY Garland

5699

Codeforces 1283E: New Year Parties

5698

Codeforces 1283D: Christmas Trees

5697

Codeforces 1283C: Friends and Gifts

5696