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)
15351	DMOJ BPC 1 S5 - Temple
15350	DMOJ BPC 1 S4 - Binary Matrices
15349	DMOJ BPC 1 S3 - Bus Stops
15348	DMOJ BPC 1 S2 - Train Commute
15347	DMOJ BPC 1 S1 - Homework Questions
15346	DMOJ BPC 1 J5 - Set
15345	DMOJ BPC 1 J4 - Assignment of the Year
15344	DMOJ BPC 1 J3 - Group Project
15343	DMOJ BPC 1 J2 - Cake
15342	DMOJ BPC 1 J1 - Facial Recognition
15341	DMOJ Union Laser
15340	DMOJ Boxlings
15339	DMOJ Stacking Boxes
15338	DMOJ Boxdropper
15337	DMOJ Boolean
15336	DMOJ Bohemian Rhaksody
15335	DMOJ Bob's Temple
15334	DMOJ Bob's Rocks
15333	DMOJ Bob Hates Triangles
15332	DMOJ Board Games
15331	DMOJ A Block Game
15330	DMOJ Balkan OI '11 P6 - Trapezoids
15329	DMOJ Balkan OI '11 P5 - Time Is Money
15328	DMOJ Balkan OI '11 P4 - Compare
15327	DMOJ Balkan OI '11 P3 - Medians
15326	DMOJ Balkan OI '11 P2 - Decrypt
15325	DMOJ Balkan OI '11 P1 - Two Circles
15324	DMOJ Bitmask Magic
15323	DMOJ Fast Bit Duplication
15322	DMOJ Bit Combinations
15321	DMOJ Bill's Binoculars
15320	DMOJ Binary
15319	DMOJ Bulgarian OI '09 P6 - Diamonds
15318	DMOJ Bulgarian OI '09 P5 - Special Sequence
15317	DMOJ Bulgarian OI '09 P4 - Frogs
15316	DMOJ Bulgarian OI '09 P2 - Boxen
15315	DMOJ Bulgarian OI '09 P1 - Minesweeper
15314	DMOJ Back From Summer '19 P6: Composite Zeyu
15313	DMOJ Back From Summer '19 P5: ABC123E
15312	DMOJ Back From Summer '19 P4: Wesley And Cake
15311	DMOJ Back From Summer '19 P3: ASDFGHJKL
15310	DMOJ Back From Summer '19 P2: Straying From God's Light
15309	DMOJ Back From Summer '19 P1: Winnie's Orphans
15308	DMOJ Back From Summer '17 P6: Crowded Cities
15307	DMOJ Back From Summer '17 P5: Confusing Codeforces Contest
15306	DMOJ Back From Summer '17 P4: Pair Programming
15305	DMOJ Back From Summer '17 P3: Basketball Dodgeball
15304	DMOJ Back From Summer '17 P2: Crayola Lightsaber
15303	DMOJ Back From Summer '17 P1: Pithy Pastimes
15302	DMOJ String Finding - Hacking

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

15351

DMOJ BPC 1 S5 - Temple

15350

DMOJ BPC 1 S4 - Binary Matrices

15349

DMOJ BPC 1 S3 - Bus Stops

15348

DMOJ BPC 1 S2 - Train Commute

15347

DMOJ BPC 1 S1 - Homework Questions

15346