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)
3801	Codeforces 894B: Ralph And His Magic Field
3800	Codeforces 894A: QAQ
3799	Codeforces 893F: Subtree Minimum Query
3798	Codeforces 893E: Counting Arrays
3797	Codeforces 893D: Credit Card
3796	Codeforces 893C: Rumor
3795	Codeforces 893B: Beautiful Divisors
3794	Codeforces 893A: Chess For Three
3793	Codeforces 892B: Wrath
3792	Codeforces 892A: Greed
3791	Codeforces 891E: Lust
3790	Codeforces 891D: Sloth
3789	Codeforces 891C: Envy
3788	Codeforces 891B: Gluttony
3787	Codeforces 891A: Pride
3786	Codeforces 889E: Mod Mod Mod
3785	Codeforces 888G: Xor-MST
3784	Codeforces 888F: Connecting Vertices
3783	Codeforces 888E: Maximum Subsequence
3782	Codeforces 888D: Almost Identity Permutations
3781	Codeforces 888C: K-Dominant Character
3780	Codeforces 888B: Buggy Robot
3779	Codeforces 888A: Local Extrema
3778	Codeforces 887F: Row of Models
3777	Codeforces 887E: Little Brother
3776	Codeforces 887D: Ratings and Reality Shows
3775	Codeforces 887C: Solution for Cube
3774	Codeforces 887B: Cubes for Masha
3773	Codeforces 887A: Div. 64
3772	Codeforces 886F: Symmetric Projections
3771	Codeforces 886E: Maximum Element
3770	Codeforces 886D: Restoration of string
3769	Codeforces 886C: Petya and Catacombs
3768	Codeforces 886B: Vlad and Cafes
3767	Codeforces 886A: ACM ICPC
3766	Codeforces 884F: Anti-Palindromize
3765	Codeforces 884E: Binary Matrix
3764	Codeforces 884D: Boxes And Balls
3763	Codeforces 884C: Bertown Subway
3762	Codeforces 884B: Japanese Crosswords Strike Back
3761	Codeforces 884A: Book Reading
3760	Codeforces 883M: Quadcopter Competition
3759	Codeforces 883L: Berland.Taxi
3758	Codeforces 883K: Road Widening
3757	Codeforces 883J: Renovation
3756	Codeforces 883I: Photo Processing
3755	Codeforces 883H: Palindromic Cut
3754	Codeforces 883G: Orientation of Edges
3753	Codeforces 883F: Lost in Transliteration
3752	Codeforces 883E: Field of Wonders

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

3801

Codeforces 894B: Ralph And His Magic Field

3800

Codeforces 894A: QAQ

3799

Codeforces 893F: Subtree Minimum Query

3798

Codeforces 893E: Counting Arrays

3797

Codeforces 893D: Credit Card

3796