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)
19051	DMOJ Secret Room
19050	DMOJ Scroll
19049	DMOJ Busy Schedule
19048	DMOJ Spring Coding Bowl '22 P5 - Temple Placement
19047	DMOJ Spring Coding Bowl '22 P4 - Circle Game
19046	DMOJ Spring Coding Bowl '22 P2 - Chicken Strips
19045	DMOJ Spring Coding Bowl '22 P1 - Student Numbers
19044	DMOJ Scansion
19043	DMOJ Super Boggle
19042	DMOJ Sword Art Online Judge 3
19041	DMOJ Sword Art Online Judge 2
19040	DMOJ Sword Art Online Judge
19039	DMOJ Sandwich
19038	DMOJ Salsifa Hall
19037	DMOJ Sales
19036	DMOJ South African Computer Olympiad 2008 Day 1 Problem 3 - Visiting Grandma
19035	DMOJ SAC '22 Code Challenge 5 P5 - Querying Rectangles
19034	DMOJ SAC '22 Code Challenge 5 P4 - Querying Intervals
19033	DMOJ SAC '22 Code Challenge 5 P3 - Querying Presents
19032	DMOJ SAC '22 Code Challenge 5 P2 - Querying Extensions
19031	DMOJ SAC '22 Code Challenge 5 P1 - Querying Plants
19030	DMOJ SAC '22 Code Challenge 5 Junior P5 - English Summative
19029	DMOJ SAC '22 Code Challenge 5 Junior P4 - Course Requirements
19028	DMOJ SAC '22 Code Challenge 5 Junior P3 - Media List
19027	DMOJ SAC '22 Code Challenge 5 Junior P2 - Badminton Scoring
19026	DMOJ SAC '22 Code Challenge 5 Junior P1 - Monkey, Type!
19025	DMOJ SAC '22 Code Challenge 4 P5 - Obligatory Interactive Problem
19024	DMOJ SAC '22 Code Challenge 4 P4 - Obligatory Subarray Problem
19023	DMOJ SAC '22 Code Challenge 4 P3 - Obligatory Math Problem
19022	DMOJ SAC '22 Code Challenge 4 P2 - Obligatory String Problem
19021	DMOJ SAC '22 Code Challenge 4 P1 - Obligatory Car Problem
19020	DMOJ SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
19019	DMOJ SAC '22 Code Challenge 4 Junior P4 - Obligatory Permutation Problem
19018	DMOJ SAC '22 Code Challenge 4 Junior P3 - Obligatory Triangle Problem
19017	DMOJ SAC '22 Code Challenge 4 Junior P2 - Obligatory Geometry Problem
19016	DMOJ SAC '22 Code Challenge 4 Junior P1 - Obligatory DeMello Problem
19015	DMOJ SAC '22 Code Challenge 3 P5 - Chat Corrections
19014	DMOJ SAC '22 Code Challenge 3 P4 - Finding Friends
19013	DMOJ SAC '22 Code Challenge 3 P3 - Bob Sort
19012	DMOJ SAC '22 Code Challenge 3 P2 - Unicycle License
19011	DMOJ SAC '22 Code Challenge 3 P1 - Hair Hazards
19010	DMOJ SAC '22 Code Challenge 3 Junior P5 - Normal Encoding
19009	DMOJ SAC '22 Code Challenge 3 Junior P4 - Normal Conversions
19008	DMOJ SAC '22 Code Challenge 3 Junior P3 - Normal Probabilities
19007	DMOJ SAC '22 Code Challenge 3 Junior P2 - Normal Lines
19006	DMOJ SAC '22 Code Challenge 3 Junior P1 - Normal Problem
19005	DMOJ SAC '22 Code Challenge 2 P5 - Even Colouring
19004	DMOJ SAC '22 Code Challenge 2 P4 - Cookie Galore
19003	DMOJ SAC '22 Code Challenge 2 P3 - Rating Choices
19002	DMOJ SAC '22 Code Challenge 2 P2 - Cookie Sprinkler

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

19051

DMOJ Secret Room

19050

DMOJ Scroll

19049

DMOJ Busy Schedule

19048

DMOJ Spring Coding Bowl '22 P5 - Temple Placement

19047

DMOJ Spring Coding Bowl '22 P4 - Circle Game

19046