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)
23601	USACO 2019 February Contest, Silver: Sleepy Cow Herding
23600	USACO 2019 February Contest, Gold: Painting the Barn
23599	USACO 2019 February Contest, Gold: Dishwashing
23598	USACO 2019 February Contest, Gold: Cow Land
23597	USACO 2019 February Contest, Platinum: Mowing Mischief
23596	USACO 2019 February Contest, Platinum: Moorio Kart
23595	USACO 2019 February Contest, Platinum: Cow Dating
23594	USACO 2019 January Contest, Bronze: Guess the Animal
23593	USACO 2019 January Contest, Bronze: Sleepy Cow Sorting
23592	USACO 2019 January Contest, Bronze: Shell Game
23591	USACO 2019 January Contest, Silver: Mountain View
23590	USACO 2019 January Contest, Silver: Icy Perimeter
23589	USACO 2019 January Contest, Silver: Grass Planting
23588	USACO 2019 January Contest, Gold: Shortcut
23587	USACO 2019 January Contest, Gold: Sleepy Cow Sorting
23586	USACO 2019 January Contest, Gold: Cow Poetry
23585	USACO 2019 January Contest, Platinum: Train Tracking 2
23584	USACO 2019 January Contest, Platinum: Exercise Route
23583	USACO 2019 January Contest, Platinum: Redistricting
23582	USACO 2019 December Contest, Bronze: Livestock Lineup
23581	USACO 2019 December Contest, Bronze: Where Am I?
23580	USACO 2019 December Contest, Bronze: Cow Gymnastics
23579	USACO 2019 December Contest, Silver: Milk Visits
23578	USACO 2019 December Contest, Silver: Meetings
23577	USACO 2019 December Contest, Silver: MooBuzz
23576	USACO 2019 December Contest, Gold: Moortal Cowmbat
23575	USACO 2019 December Contest, Gold: Milk Visits
23574	USACO 2019 December Contest, Gold: Milk Pumping
23573	USACO 2019 December Contest, Platinum: Tree Depth
23572	USACO 2019 December Contest, Platinum: Bessie's Snow Cow
23571	USACO 2019 December Contest, Platinum: Greedy Pie Eaters
23570	USACO 2018 US Open Contest, Bronze: Family Tree
23569	USACO 2018 US Open Contest, Bronze: Milking Order
23568	USACO 2018 US Open Contest, Bronze: Team Tic Tac Toe
23567	USACO 2018 US Open Contest, Silver: Multiplayer Moo
23566	USACO 2018 US Open Contest, Silver: Lemonade Line
23565	USACO 2018 US Open Contest, Silver: Out of Sorts
23564	USACO 2018 US Open Contest, Gold: Talent Show
23563	USACO 2018 US Open Contest, Gold: Milking Order
23562	USACO 2018 US Open Contest, Gold: Out of Sorts
23561	USACO 2018 US Open Contest, Platinum: Disruption
23560	USACO 2018 US Open Contest, Platinum: Train Tracking
23559	USACO 2018 US Open Contest, Platinum: Out of Sorts
23558	USACO 2018 February Contest, Bronze: Taming the Herd
23557	USACO 2018 February Contest, Bronze: Hoofball
23556	USACO 2018 February Contest, Bronze: Teleportation
23555	USACO 2018 February Contest, Silver: Teleportation
23554	USACO 2018 February Contest, Silver: Snow Boots
23553	USACO 2018 February Contest, Silver: Rest Stops
23552	USACO 2018 February Contest, Gold: Taming the Herd

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

23601

USACO 2019 February Contest, Silver: Sleepy Cow Herding

23600

USACO 2019 February Contest, Gold: Painting the Barn

23599

USACO 2019 February Contest, Gold: Dishwashing

23598

USACO 2019 February Contest, Gold: Cow Land

23597

USACO 2019 February Contest, Platinum: Mowing Mischief

23596