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.

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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)
15201	DMOJ APIO '10 P1 - Commando
15200	DMOJ APIO '09 P3 - The Great ATM Robbery
15199	DMOJ APIO '09 P2 - The Siruseri Convention Centre
15198	DMOJ APIO '09 P1 - Digging for Oil
15197	DMOJ APIO '08 P3 - DNA
15196	DMOJ APIO '08 P2 - Roads
15195	DMOJ APIO '07 P3 - Zoo
15194	DMOJ APIO '07 P2 - Backup
15193	DMOJ APIO '07 P1 - Mobiles
15192	DMOJ Another Sorting
15191	DMOJ A Noisy Class
15190	DMOJ Angie and Functions
15189	DMOJ A New Country
15188	DMOJ Andrew Needs Help
15187	DMOJ And Password
15186	DMOJ Troubling Times
15185	DMOJ Adaptive Mechanized Calcium Chlorohypochlorite
15184	DMOJ Alphabet Score
15183	DMOJ A Long Problem
15182	DMOJ Sum of Primes 2
15181	DMOJ Alawn's Problem
15180	DMOJ A Harder Game
15179	DMOJ April Fools' Day Contest 1 P8 - NP-Hard
15178	DMOJ April Fools' Day Contest 1 P7 - Half-Plane Intersection
15177	DMOJ April Fools' Day Contest 1 P6 - April Fools' Day (BOJ Edition)
15176	DMOJ April Fools' Day Contest 1 P5 - Definition
15175	DMOJ April Fools' Day Contest 1 P4 - Choosing Choosily
15174	DMOJ April Fools' Day Contest 1 P3 - Author
15173	DMOJ April Fools' Day Contest 1 P2 - Sample Case
15172	DMOJ April Fools' Day Contest 1 P1 - Sample Case
15171	DMOJ A Digit Problem
15170	DMOJ ACSL '09 Contest 3 Senior - Pinochle
15169	DMOJ ACSL '09 Contest 1 Senior - Bridge
15168	DMOJ ACSL '09 Practice P7 - Cube
15167	DMOJ ACSL '09 Practice P6 - Expression
15166	DMOJ ACSL '09 Practice P5 - Fax
15165	DMOJ ACSL '09 Practice P4 - Rank
15164	DMOJ ACSL '09 Practice P3 - Zeroes
15163	DMOJ ACSL '09 Practice P2 - Cars
15162	DMOJ ACSL '09 Practice P1 - Kansas
15161	DMOJ A Combining Problem
15160	DMOJ A Coin Problem
15159	DMOJ ACM U of T Tryouts C3 G - Office Mates
15158	DMOJ ACM U of T Tryouts C3 F - A Pleasant Stroll
15157	DMOJ ACM U of T Tryouts C3 E - A Brief Expedition
15156	DMOJ ACM U of T Tryouts C3 D - A Frightening Evening
15155	DMOJ ACM U of T Tryouts C3 C - A Subtle Surf
15154	DMOJ ACM U of T Tryouts C3 B - A Careful Reply
15153	DMOJ ACM U of T Tryouts C3 A - A Research Project
15152	DMOJ ACM U of T Tryouts C2 F - Light Cyclin'

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

15201

DMOJ APIO '10 P1 - Commando

15200

DMOJ APIO '09 P3 - The Great ATM Robbery

15199

DMOJ APIO '09 P2 - The Siruseri Convention Centre

15198

DMOJ APIO '09 P1 - Digging for Oil

15197

DMOJ APIO '08 P3 - DNA

15196