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)
18651	DMOJ NOI '08 P3 - Hiring Employees
18650	DMOJ NOI '08 P2 - Course Design
18649	DMOJ NOI '08 P1 - Masquerade Party
18648	DMOJ NOI '07 P6 - Thief Catching
18647	DMOJ NOI '07 P5 - Counting Spanning Trees
18646	DMOJ NOI '07 P4 - Necklace Factory
18645	DMOJ NOI '07 P3 - Surrounding Battalions
18644	DMOJ NOI '07 P2 - Cash Exchange
18643	DMOJ NOI '07 P1 - Social Network
18642	DMOJ NOI '06 P6 - The Magical Bag
18641	DMOJ NOI '06 P5 - The Clever Tour Guide
18640	DMOJ NOI '06 P4 - Maximum Profit
18639	DMOJ NOI '06 P3 - Millennium Worm
18638	DMOJ NOI '06 P1 - Network Charges
18637	DMOJ NOI '05 P6 - Lemon Tree Under the Moon
18636	DMOJ NOI '05 P5 - Little H's Party
18635	DMOJ NOI '05 P4 - CongCong and KoKo
18634	DMOJ NOI '05 P3 - Wisdom Beads Game
18633	DMOJ NOI '05 P2 - Maintaining a Sequence
18632	DMOJ NOI '05 P1 - The Magnificent Waltz
18631	DMOJ NOI '04 P5 - Little H's Little Hut
18630	DMOJ NOI '04 P4 - Rainfall
18629	DMOJ NOI '04 P3 - Manhattan
18628	DMOJ NOI '04 P1 - The Depressed Cashier
18627	DMOJ NOI '03 P6 - Wisdom Breaking Connection
18626	DMOJ NOI '03 P4 - Data Generator
18625	DMOJ NOI '03 P2 - Text Editor
18624	DMOJ NOI '03 P1 - Stick Game
18623	DMOJ NOI '02 P6 - Robot No. M
18622	DMOJ NOI '02 P5 - New Tetris
18621	DMOJ NOI '02 P4 - Island of Cavemen
18620	DMOJ NOI '02 P3 - The Greedy Kuzuryū
18619	DMOJ NOI '02 P2 - Naughty Kid
18618	DMOJ NOI '02 P1 - Legend of the Galactic Heroes
18617	DMOJ NOI '01 P6 - Secret of the Meteorite
18616	DMOJ NOI '01 P5 - Equation Solutions
18615	DMOJ NOI '01 P4 - Applications of Arctangent
18614	DMOJ NOI '01 P3 - The Clever Typist
18613	DMOJ NOI '01 P2 - Artillery Positioning
18612	DMOJ NOI '01 P1 - Food Chain
18611	DMOJ NOI '00 P6 - Symbol Deciphering
18610	DMOJ NOI '00 P5 - Frogs Crossing the River
18609	DMOJ NOI '00 P4 - Trie
18608	DMOJ NOI '00 P3 - Mystery of the Lost City
18607	DMOJ NOI '00 P2 - Program Parser
18606	DMOJ NOI '00 P1 - Ceramic Necklace
18605	DMOJ NO ACM NO LIFE
18604	DMOJ N-K Special
18603	DMOJ What a Niche
18602	DMOJ Next Semiprime

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

18651

DMOJ NOI '08 P3 - Hiring Employees

18650

DMOJ NOI '08 P2 - Course Design

18649

DMOJ NOI '08 P1 - Masquerade Party

18648

DMOJ NOI '07 P6 - Thief Catching

18647

DMOJ NOI '07 P5 - Counting Spanning Trees

18646