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)
18851	DMOJ BlueBook - Voting
18850	DMOJ BlueBook - Sieve
18849	DMOJ BlueBook - Triangle
18848	DMOJ BlueBook - Magic Square
18847	DMOJ BlueBook - Mode
18846	DMOJ BlueBook - Payment
18845	DMOJ BlueBook - Max
18844	DMOJ BlueBook - Bills Bills Bills
18843	DMOJ BlueBook - 10 Primes on a Line
18842	DMOJ BlueBook - Exact Divisors
18841	DMOJ BlueBook - Digits and Sums
18840	DMOJ BlueBook - Pop Explosion
18839	DMOJ BlueBook - Column of Numbers
18838	DMOJ BlueBook - Find the Character
18837	DMOJ BlueBook - Powers of 2
18836	DMOJ BlueBook - Power Base
18835	DMOJ BlueBook - World Pop
18834	DMOJ BlueBook - Interest
18833	DMOJ BlueBook - Max is Last
18832	DMOJ BlueBook - Times Tables
18831	DMOJ BlueBook - Change
18830	DMOJ BlueBook - Pay
18829	DMOJ BlueBook - Direction
18828	DMOJ BlueBook - Cost
18827	DMOJ BlueBook - Cross Country
18826	DMOJ Another Small Favour
18825	DMOJ One Small Favour
18824	DMOJ Returning Home
18823	DMOJ Mailing Origami
18822	DMOJ Matchings
18821	DMOJ A Fenwick Tree Question
18820	DMOJ Longest Up-Down Subsequence
18819	DMOJ Olympic Scoring
18818	DMOJ Bob's Farm
18817	DMOJ AQT's Tree Game
18816	DMOJ Overflow
18815	DMOJ The Odd Number
18814	DMOJ OCC '19 S6 - City Tolls
18813	DMOJ OCC '19 S5 - Partitioning
18812	DMOJ OCC '19 S3 - NAN Language
18811	DMOJ OCC '19 S2 - Rimuru's Number Game
18810	DMOJ OCC '19 S1 - Floor Planning
18809	DMOJ OCC '19 G6 - Monkeys in a Tree
18808	DMOJ OCC '19 G5 - King kobortor's Infrastructure
18807	DMOJ OCC '19 G4 - Willson and Fighting
18806	DMOJ OCC '19 G3 - Binary Game
18805	DMOJ OCC '19 G2 - A Guessing Game
18804	DMOJ OCC '19 G1 - Top Coder
18803	DMOJ OCC '19 B6 - Fiji water
18802	DMOJ OCC '19 B5 - Gold

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

18851

DMOJ BlueBook - Voting

18850

DMOJ BlueBook - Sieve

18849

DMOJ BlueBook - Triangle

18848

DMOJ BlueBook - Magic Square

18847

DMOJ BlueBook - Mode

18846