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)
18401	DMOJ MMM '14 C - Pie Shop
18400	DMOJ MMM '14 B - Benergy Transfer
18399	DMOJ MMM '14 A - Distinct Prime Factors
18398	DMOJ MMCC '15 P3 - Momoka
18397	DMOJ MMCC '15 P2 - Akame
18396	DMOJ MMCC '15 P1 - Inaho
18395	DMOJ MMCC '14 P3 - Esdeath
18394	DMOJ MMCC '14 P2 - Kirito
18393	DMOJ MMCC '14 P1 - Tenri
18392	DMOJ Multiplication Improvement
18391	DMOJ Maximum Independent Subset
18390	DMOJ Miracle Sort
18389	DMOJ Miniature Sudoku
18388	DMOJ Meta
18387	DMOJ Median Modulo
18386	DMOJ MEC '16 P6 - Instruments of the Ghostwriters
18385	DMOJ MEC '16 P4 - Circuitry
18384	DMOJ MEC '16 P3 - Getting Good at Programming
18383	DMOJ MEC '16 P2 - Conveyor Belt
18382	DMOJ MEC '16 P1 - Bat-Doctor
18381	DMOJ MCIPC Contest 2 P6 - Block Tower
18380	DMOJ MCIPC Contest 2 P5 - Holiday Chocolates
18379	DMOJ MCIPC Contest 2 P4 - Wreath
18378	DMOJ MCIPC Contest 2 P3 - Snowy Streets
18377	DMOJ MCIPC Contest 2 P2 - Icicles
18376	DMOJ MCIPC Contest 2 P1 - Super Mega Snowball
18375	DMOJ MCIPC Contest 1 P5 - Rainwater
18374	DMOJ MCIPC Contest 1 P4 - Snack Line
18373	DMOJ MCIPC Contest 1 P1 - Cypher
18372	DMOJ MCIPC Contest 1 P2 - Infinite Chessboard
18371	DMOJ MCIPC Contest 1 P1 - Factoring
18370	DMOJ Mock CCO '19 Contest 2 Problem 6 - A Fundraising Problem
18369	DMOJ Mock CCO '19 Contest 2 Problem 5 - A Geometry Problem
18368	DMOJ Mock CCO '19 Contest 2 Problem 4 - A Geometry Problem
18367	DMOJ Mock CCO '19 Contest 2 Problem 3 - A Cactus Problem
18366	DMOJ Mock CCO '19 Contest 2 Problem 2 - A Simulation Problem
18365	DMOJ Mock CCO '19 Contest 2 Problem 1 - A Dynamic Connectivity Problem
18364	DMOJ Mock CCO '19 Contest 1 Problem 6 - A Geometry Problem
18363	DMOJ Mock CCO '19 Contest 1 Problem 5 - A Tree Problem
18362	DMOJ Mock CCO '19 Contest 1 Problem 4 - A Chemistry Problem
18361	DMOJ Mock CCO '17 Problem 6 - Dire Consequences
18360	DMOJ Mock CCO '17 Problem 5 - Blitzkrieg
18359	DMOJ Mock CCO '17 Problem 4 - Guards
18358	DMOJ Mock CCO '17 Problem 3 - Connection
18357	DMOJ Mock CCO '17 Problem 2 - Penetrating Power
18356	DMOJ Mock CCO '17 Problem 1 - Fast Fuhrer Transform
18355	DMOJ Mock CCC '23 Contest 1 J5 - Calculus Problem
18354	DMOJ Mock CCC '23 Contest 1 J4 - String Decryption
18353	DMOJ Mock CCC '23 Contest 1 J3 - Pairing Gifts
18352	DMOJ Mock CCC '23 Contest 1 J2 - Healthy Schedule

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

18401

DMOJ MMM '14 C - Pie Shop

18400

DMOJ MMM '14 B - Benergy Transfer

18399

DMOJ MMM '14 A - Distinct Prime Factors

18398

DMOJ MMCC '15 P3 - Momoka

18397

DMOJ MMCC '15 P2 - Akame

18396