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)
19651	DMOJ WC '17 Finals S5 - Crop Rectangles
19650	DMOJ WC '17 Finals S4 - Ultimatum
19649	DMOJ WC '17 Finals S3 - Explosive Ordinance Disposal
19648	DMOJ WC '17 Finals S2 - Cowmmunication Network
19647	DMOJ WC '17 Finals S1 - An Interspecific Army
19646	DMOJ WC '17 Finals J2 - Redundant Formations
19645	DMOJ WC '17 Finals J1 - Cownterintelligence
19644	DMOJ WC '17 Contest 4 S4 - Alpha Nerd (Hard)
19643	DMOJ WC '17 Contest 4 S4 - Alpha Nerd
19642	DMOJ WC '17 Contest 4 S3 - Guardians of the Cash
19641	DMOJ WC '17 Contest 4 S2 - Strange Travels
19640	DMOJ WC '17 Contest 4 S1 - Wakandan Sabotage
19639	DMOJ WC '17 Contest 4 J4 - Efficiency
19638	DMOJ WC '17 Contest 4 J3 - The Infinity Stones
19637	DMOJ WC '17 Contest 4 J2 - Anger Management
19636	DMOJ WC '17 Contest 4 J1 - Fight or Flight
19635	DMOJ WC '17 Contest 3 S4 - Relevant Results
19634	DMOJ WC '17 Contest 3 S3 - Down for Maintenance
19633	DMOJ WC '17 Contest 3 S2 - GleamingProudChickenFunRun
19632	DMOJ WC '17 Contest 3 S1 - Mutual Friends
19631	DMOJ WC '17 Contest 3 J4 - Meme Generator
19630	DMOJ WC '17 Contest 3 J3 - Uncrackable
19629	DMOJ WC '17 Contest 3 J2 - Certified Fresh
19628	DMOJ WC '17 Contest 3 J1 - Like, Comment, and Subscribe!
19627	DMOJ WC '17 Contest 2 S4 - One Does Not Simply Walk Into Mordor
19626	DMOJ WC '17 Contest 2 S3 - Battle of the Pelennor Fields
19625	DMOJ WC '17 Contest 2 S2 - Don't Follow the Lights
19624	DMOJ WC '17 Contest 2 S1 - Keeping Score
19623	DMOJ WC '17 Contest 2 J4 - Entish Translation
19622	DMOJ WC '17 Contest 2 J3 - Escaping the Mines
19621	DMOJ WC '17 Contest 2 J2 - Breeding an Army
19620	DMOJ WC '17 Contest 2 J1 - The Rings of Power
19619	DMOJ WC '17 Contest 1 S4 - Change
19618	DMOJ WC '17 Contest 1 S3 - Crosscountry Canada
19617	DMOJ WC '17 Contest 1 S2 - Ride the Rocket
19616	DMOJ WC '17 Contest 1 S1 - On the Rocks
19615	DMOJ WC '17 Contest 1 J4 - Canuck Detection
19614	DMOJ WC '17 Contest 1 J3 - Stanley
19613	DMOJ WC '17 Contest 1 J2 - How's the Weather?
19612	DMOJ WC '17 Contest 1 J1 - Canadian Accent
19611	DMOJ WC '16 Finals S5 - Bovine Grenadiers
19610	DMOJ WC '16 Finals S4 - Bug Infestation
19609	DMOJ WC '16 Finals S3 - Privacy
19608	DMOJ WC '16 Finals S2 - Rational Recipes
19607	DMOJ WC '16 Finals S1 - Cow-Bot Construction
19606	DMOJ WC '16 Finals J2 - Enigmoo
19605	DMOJ WC '16 Finals J1 - Fencing
19604	DMOJ WC '16 Contest 4 S4 - Hopps and Wilde on the Case
19603	DMOJ WC '16 Contest 4 S3 - Night Howlers
19602	DMOJ WC '16 Contest 4 S2 - Pawpsicles

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

19651

DMOJ WC '17 Finals S5 - Crop Rectangles

19650

DMOJ WC '17 Finals S4 - Ultimatum

19649

DMOJ WC '17 Finals S3 - Explosive Ordinance Disposal

19648

DMOJ WC '17 Finals S2 - Cowmmunication Network

19647

DMOJ WC '17 Finals S1 - An Interspecific Army

19646