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)
18951	DMOJ Riolku's Mock CCC S4 - Clumsy Cindy
18950	DMOJ Riolku's Mock CCC S3 - Mosey's Birthday
18949	DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence (Hard Version)
18948	DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence
18947	DMOJ Riolku's Mock CCC S1 - Word Bot
18946	DMOJ Raytracing
18945	DMOJ Ray Needs Help
18944	DMOJ Rat In A Maze
18943	DMOJ Heap Dijkstra Revisited
18942	DMOJ Quine
18941	DMOJ QCC P6 - Freedom!
18940	DMOJ QCC P5 - Vaccine Delivery
18939	DMOJ QCC P4 - Genetic Sequencing
18938	DMOJ QCC P3 - Cohorts
18937	DMOJ QCC P2 - Online School
18936	DMOJ QCC P1 - Quarantine Games
18935	DMOJ QCC P0 - Thermometer
18934	DMOJ Decoding
18933	DMOJ Disclosure
18932	DMOJ Self-deception
18931	DMOJ Python PIe
18930	DMOJ VMSS Pre-Windsor P7 - Going Back to the Definitions
18929	DMOJ VMSS Pre-Windsor P6 - You Can't Write Science Fiction Better Than This
18928	DMOJ VMSS Pre-Windsor P5 - Math Depression
18927	DMOJ VMSS Pre-Windsor P4 - Character Analysis
18926	DMOJ VMSS Pre-Windsor P3 - Composite Bag
18925	DMOJ VMSS Pre-Windsor P2 - Get Off My Lawn
18924	DMOJ VMSS Pre-Windsor P1 - Java
18923	DMOJ Purple Lemon
18922	DMOJ Pulse
18921	DMOJ Pyramid Puzzle
18920	DMOJ Prime Street
18919	DMOJ Primes 3
18918	DMOJ Primes 2
18917	DMOJ Primes
18916	DMOJ Prime Factorization
18915	DMOJ Prime Bag
18914	DMOJ Presents
18913	DMOJ PEG-O-Stripes
18912	DMOJ There's a Hole in the Bucket
18911	DMOJ Circular Numbers
18910	DMOJ Factorial Sum List
18909	DMOJ Machined Surfaces
18908	DMOJ VMSS Pre-Pre-Windsor P7 - Magical Bribery
18907	DMOJ VMSS Pre-Pre-Windsor P6 - InterNAV
18906	DMOJ VMSS Pre-Pre-Windsor P5 - Productive Math Class
18905	DMOJ VMSS Pre-Pre-Windsor P4 - The New Kid
18904	DMOJ VMSS Pre-Pre-Windsor P3 - SC2 Multitasking
18903	DMOJ VMSS Pre-Pre-Windsor P2 - Big Chess
18902	DMOJ VMSS Pre-Pre-Windsor P1 - Mr. White's Carnival

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

18951

DMOJ Riolku's Mock CCC S4 - Clumsy Cindy

18950

DMOJ Riolku's Mock CCC S3 - Mosey's Birthday

18949

DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence (Hard Version)

18948

DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence

18947

DMOJ Riolku's Mock CCC S1 - Word Bot

18946