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)
701	Codeforces 148C: Terse princess
700	Codeforces 148B: Escape
699	Codeforces 148A: Insomnia cure
698	Codeforces 147B: Smile House
697	Codeforces 147A: Punctuation
696	Codeforces 146B: Lucky Mask
695	Codeforces 146A: Lucky Ticket
694	Codeforces 145E: Lucky Queries
693	Codeforces 145D: Lucky Pair
692	Codeforces 145C: Lucky Subsequence
691	Codeforces 145B: Lucky Number 2
690	Codeforces 145A: Lucky Conversion
689	Codeforces 144E: Competition
688	Codeforces 144D: Missile Silos
687	Codeforces 144C: Anagram Search
686	Codeforces 144B: Meeting
685	Codeforces 144A: Arrival of the General
684	Codeforces 143B: Help Kingdom of Far Far Away 2
683	Codeforces 143A: Help Vasilisa the Wise 2
682	Codeforces 142E: Help Greg the Dwarf 2
681	Codeforces 142D: Help Shrek and Donkey 2
680	Codeforces 142C: Help Caretaker
679	Codeforces 142B: Help General
678	Codeforces 142A: Help Farmer
677	Codeforces 141E: Clearing Up
676	Codeforces 141D: Take-off Ramps
675	Codeforces 141C: Queue
674	Codeforces 141B: Hopscotch
673	Codeforces 141A: Amusing Joke
672	Codeforces 140F: New Year Snowflake
671	Codeforces 140E: New Year Garland
670	Codeforces 140D: New Year Contest
669	Codeforces 140C: New Year Snowmen
668	Codeforces 140B: New Year Cards
667	Codeforces 140A: New Year Table
666	Codeforces 139B: Wallpaper
665	Codeforces 139A: Petr and Book
664	Codeforces 138E: Hellish Constraints
663	Codeforces 138D: World of Darkraft
662	Codeforces 138C: Mushroom Gnomes - 2
661	Codeforces 138B: Digits Permutations
660	Codeforces 138A: Literature Lesson
659	Codeforces 137E: Last Chance
658	Codeforces 137D: Palindromes
657	Codeforces 137C: History
656	Codeforces 137B: Permutation
655	Codeforces 137A: Postcards and photos
654	Codeforces 136B: Ternary Logic
653	Codeforces 136A: Presents
652	Codeforces 135E: Weak Subsequence

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

701

Codeforces 148C: Terse princess

700

Codeforces 148B: Escape

699

Codeforces 148A: Insomnia cure

698

Codeforces 147B: Smile House

697

Codeforces 147A: Punctuation

696