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)
16801	DMOJ DMOPC '13 Contest 3 P2 - Phone Microwave
16800	DMOJ DMOPC '13 Contest 3 P1 - Sharing is Caring
16799	DMOJ DMOPC '13 Contest 1 P5 - Math on Titan
16798	DMOJ DMOPC '13 Contest 1 P4 - AFK
16797	DMOJ DMOJLand Series: Fake Judges
16796	DMOJ Divisibility Rules
16795	DMOJ Divide and Mod
16794	DMOJ Distinct Shapes
16793	DMOJ Discerning Discounts
16792	DMOJ Please Help Me
16791	DMOJ Digit Sum
16790	DMOJ Digger
16789	DMOJ Detectors
16788	DMOJ Matrix Determinant
16787	DMOJ More German Nouns
16786	DMOJ German Nouns
16785	DMOJ Age Demographic
16784	DMOJ DeMello's Leeches
16783	DMOJ Death Gun
16782	DMOJ Double Doors Regional P6 - Tudor Learns More DDR
16781	DMOJ Double Doors Regional P5 - Tudor Eats Ice Cream Cones
16780	DMOJ Double Doors Regional P4 - Tudor Teaches Jason How To Be Productive
16779	DMOJ Double Doors Regional P3 - Tudor and the Pusheens
16778	DMOJ Double Doors Regional P2 - Tudor Learns DDR
16777	DMOJ Double Doors Regional P1 - Tudor Gets a Goat
16776	DMOJ CTU Open Contest 2018 - Escalators
16775	DMOJ CTU Open Contest 2018 - Moving Furniture
16774	DMOJ CTU Open Contest 2018 - Split Game
16773	DMOJ CTU Open Contest 2018 - Horsemeet
16772	DMOJ CTU Open Contest 2018 - Lighting
16771	DMOJ CTU Open Contest 2018 - Locker Room
16770	DMOJ CTU Open Contest 2018 - Numbers Generator
16769	DMOJ CTU Open Contest 2018 - Rullete
16768	DMOJ CTU Open Contest 2018 - Security Guards
16767	DMOJ CTU Open Contest 2018 - Die
16766	DMOJ CTU Open Contest 2017 - Treetop Walkway
16765	DMOJ CTU Open Contest 2017 - Punching Power
16764	DMOJ CTU Open Contest 2017 - Dark Ride With Monsters
16763	DMOJ CTU Open Contest 2017 - Ice Cream Samples
16762	DMOJ CTU Open Contest 2017 - Shooting Gallery
16761	DMOJ CTU Open Contest 2017 - Forest Picture
16760	DMOJ CTU Open Contest 2017 - Equinox Roller Coaster
16759	DMOJ CTU Open Contest 2017 - Go Northwest!
16758	DMOJ CTU Open Contest 2017 - Chessboard Dancing
16757	DMOJ CTU Open Contest 2017 - Pond Cascade
16756	DMOJ CTU Open Contest 2017 - Amusement Anticipation
16755	DMOJ CTSC '15 P5 - Calendar Management
16754	DMOJ Brandon's Cryptographically Secure Pseudorandom Number Generator
16753	DMOJ CSPC '15 #6 - Attendance
16752	DMOJ CSPC '15 #5 - Averages

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

16801

DMOJ DMOPC '13 Contest 3 P2 - Phone Microwave

16800

DMOJ DMOPC '13 Contest 3 P1 - Sharing is Caring

16799

DMOJ DMOPC '13 Contest 1 P5 - Math on Titan

16798

DMOJ DMOPC '13 Contest 1 P4 - AFK

16797

DMOJ DMOJLand Series: Fake Judges

16796