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)
23751	USACO 2022 US Open Contest, Platinum: 262144 Revisited
23750	USACO 2022 February Contest, Bronze: Blocks
23749	USACO 2022 February Contest, Bronze: Photoshoot 2
23748	USACO 2022 February Contest, Bronze: Sleeping in Class
23747	USACO 2022 February Contest, Silver: Email Filing
23746	USACO 2022 February Contest, Silver: Robot Instructions
23745	USACO 2022 February Contest, Silver: Redistributing Gifts
23744	USACO 2022 February Contest, Gold: Moo Network
23743	USACO 2022 February Contest, Gold: Cow Camp
23742	USACO 2022 February Contest, Gold: Redistributing Gifts
23741	USACO 2022 February Contest, Platinum: Phone Numbers
23740	USACO 2022 February Contest, Platinum: Sleeping in Class
23739	USACO 2022 February Contest, Platinum: Paint by Rectangles
23738	USACO 2022 January Contest, Bronze: Drought
23737	USACO 2022 January Contest, Bronze: Non-Transitive Dice
23736	USACO 2022 January Contest, Bronze: Herdle
23735	USACO 2022 January Contest, Silver: Cereal 2
23734	USACO 2022 January Contest, Silver: Cow Frisbee
23733	USACO 2022 January Contest, Silver: Searching for Soulmates
23732	USACO 2022 January Contest, Gold: Tests for Haybales
23731	USACO 2022 January Contest, Gold: Farm Updates
23730	USACO 2022 January Contest, Gold: Drought
23729	USACO 2022 January Contest, Platinum: Multiple Choice Test
23728	USACO 2022 January Contest, Platinum: Counting Haybales
23727	USACO 2022 January Contest, Platinum: Minimizing Haybales
23726	USACO 2022 December Contest, Bronze: Reverse Engineering
23725	USACO 2022 December Contest, Bronze: Feeding the Cows
23724	USACO 2022 December Contest, Bronze: Cow College
23723	USACO 2022 December Contest, Silver: Range Reconstruction
23722	USACO 2022 December Contest, Silver: Circular Barn
23721	USACO 2022 December Contest, Silver: Barn Tree
23720	USACO 2022 December Contest, Gold: Strongest Friendship Group
23719	USACO 2022 December Contest, Gold: Mountains
23718	USACO 2022 December Contest, Gold: Bribing Friends
23717	USACO 2022 December Contest, Platinum: Palindromes
23716	USACO 2022 December Contest, Platinum: Making Friends
23715	USACO 2022 December Contest, Platinum: Breakdown
23714	USACO 2021 US Open, Bronze: Acowdemia III
23713	USACO 2021 US Open, Bronze: Acowdemia II
23712	USACO 2021 US Open, Bronze: Acowdemia I
23711	USACO 2021 US Open, Silver: Acowdemia
23710	USACO 2021 US Open, Silver: Do You Know Your ABCs?
23709	USACO 2021 US Open, Silver: Maze Tac Toe
23708	USACO 2021 US Open, Gold: Permutation
23707	USACO 2021 US Open, Gold: Portals
23706	USACO 2021 US Open, Gold: United Cows of Farmer John
23705	USACO 2021 US Open, Platinum: Balanced Subsets
23704	USACO 2021 US Open, Platinum: Routing Schemes
23703	USACO 2021 US Open, Platinum: United Cows of Farmer John
23702	USACO 2021 February Contest, Bronze: Clockwise Fence

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

23751

USACO 2022 US Open Contest, Platinum: 262144 Revisited

23750

USACO 2022 February Contest, Bronze: Blocks

23749

USACO 2022 February Contest, Bronze: Photoshoot 2

23748

USACO 2022 February Contest, Bronze: Sleeping in Class

23747

USACO 2022 February Contest, Silver: Email Filing

23746