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)
3901	Codeforces 915B: Browser
3900	Codeforces 915A: Garden
3899	Codeforces 914H: Ember and Storm's Tree Game
3898	Codeforces 914G: Sum the Fibonacci
3897	Codeforces 914F: Substrings in a String
3896	Codeforces 914E: Palindromes in a Tree
3895	Codeforces 914D: Bash and a Tough Math Puzzle
3894	Codeforces 914C: Travelling Salesman and Special Numbers
3893	Codeforces 914B: Conan and Agasa play a Card Game
3892	Codeforces 914A: Perfect Squares
3891	Codeforces 913H: Don't Exceed
3890	Codeforces 913G: Power Substring
3889	Codeforces 913F: Strongly Connected Tournament
3888	Codeforces 913E: Logical Expression
3887	Codeforces 913D: Too Easy Problems
3886	Codeforces 913C: Party Lemonade
3885	Codeforces 913B: Christmas Spruce
3884	Codeforces 913A: Modular Exponentiation
3883	Codeforces 912E: Prime Gift
3882	Codeforces 912D: Fishes
3881	Codeforces 912C: Perun, Ult!
3880	Codeforces 912B: New Year's Eve
3879	Codeforces 912A: Tricky Alchemy
3878	Codeforces 911G: Mass Change Queries
3877	Codeforces 911F: Tree Destruction
3876	Codeforces 911E: Stack Sorting
3875	Codeforces 911D: Inversion Counting
3874	Codeforces 911C: Three Garlands
3873	Codeforces 911B: Two Cakes
3872	Codeforces 911A: Nearest Minimums
3871	Codeforces 910C: Minimum Sum
3870	Codeforces 910B: Door Frames
3869	Codeforces 910A: The Way to Home
3868	Codeforces 909F: AND-permutations
3867	Codeforces 909E: Coprocessor
3866	Codeforces 909D: Colorful Points
3865	Codeforces 909C: Python Indentation
3864	Codeforces 909B: Segments
3863	Codeforces 909A: Generate Login
3862	Codeforces 908H: New Year and Boolean Bridges
3861	Codeforces 908G: New Year and Original Order
3860	Codeforces 908F: New Year and Rainbow Roads
3859	Codeforces 908E: New Year and Entity Enumeration
3858	Codeforces 908D: New Year and Arbitrary Arrangement
3857	Codeforces 908C: New Year and Curling
3856	Codeforces 908B: New Year and Buggy Bot
3855	Codeforces 908A: New Year and Counting Cards
3854	Codeforces 907B: Tic-Tac-Toe
3853	Codeforces 907A: Masha and Bears
3852	Codeforces 906E: Reverses

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

3901

Codeforces 915B: Browser

3900

Codeforces 915A: Garden

3899

Codeforces 914H: Ember and Storm's Tree Game

3898

Codeforces 914G: Sum the Fibonacci

3897

Codeforces 914F: Substrings in a String

3896