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)
15451	DMOJ Baltic OI '13 P4 - Brunhilda's Birthday
15450	DMOJ Baltic OI '13 P3 - Pipes
15449	DMOJ Baltic OI '13 P2 - Palindrome-Free Numbers
15448	DMOJ Baltic OI '13 P1 - Ball Machine
15447	DMOJ Baltic OI '12 P6 - Tiny
15446	DMOJ Baltic OI '12 P5 - Melody
15445	DMOJ Baltic OI '12 P4 - Fireworks in RightAngleles
15444	DMOJ Baltic OI '12 P3 - Peaks
15443	DMOJ Baltic OI '12 P2 - Mobile
15442	DMOJ Baltic OI '12 P1 - Brackets
15441	DMOJ Baltic OI '11 P8 - Tree Mirroring
15440	DMOJ Baltic OI '11 P7 - Polygon
15439	DMOJ Baltic OI '11 P6 - Plagiarism
15438	DMOJ Baltic OI '11 P5 - Meetings
15437	DMOJ Baltic OI '11 P4 - Treasures and Vikings
15436	DMOJ Baltic OI '11 P3 - Switch the Lamp On
15435	DMOJ Baltic OI '11 P2 - Ice Cream
15434	DMOJ Baltic OI '11 P1 - Growing Trees
15433	DMOJ Baltic OI '10 P6 - Mines
15432	DMOJ Baltic OI '10 P5 - Candies
15431	DMOJ Baltic OI '10 P4 - Matching Bins
15430	DMOJ Baltic OI '10 P3 - Printed Circuit Board
15429	DMOJ Baltic OI '10 P2 - Lego
15428	DMOJ Baltic OI '10 P1 - BEARs
15427	DMOJ Baltic OI '09 P6 - Monument
15426	DMOJ Baltic OI '09 P5 - Triangulation
15425	DMOJ Baltic OI '09 P4 - Rectangle
15424	DMOJ Baltic OI '09 P3 - Subway Signaling Error
15423	DMOJ Baltic OI '09 P2 - Candy Machine
15422	DMOJ Baltic OI '09 P1 - Beetle
15421	DMOJ Baltic OI '08 P6 - Gloves
15420	DMOJ Baltic OI '08 P5 - Grid
15419	DMOJ Baltic OI '08 P4 - Elections
15418	DMOJ Baltic OI '08 P3 - Magical Stones
15417	DMOJ Baltic OI '08 P2 - Gates
15416	DMOJ Baltic OI '08 P1 - Game
15415	DMOJ Baltic OI '07 P6 - Sequence
15414	DMOJ Baltic OI '07 P5 - Connected Points
15413	DMOJ Baltic OI '07 P4 - Building a Fence
15412	DMOJ Baltic OI '07 P3 - Sound
15411	DMOJ Baltic OI '07 P2 - Sorting
15410	DMOJ Baltic OI '07 P1 - Escape
15409	DMOJ Baltic OI '06 P6 - Jump
15408	DMOJ Baltic OI '06 P5 - RLE Compression
15407	DMOJ Baltic OI '06 P2 - Coin Collector
15406	DMOJ Baltic OI '06 P1 - Bitwise Expressions
15405	DMOJ Baltic OI '05 P6 - Polygon
15404	DMOJ Baltic OI '05 P5 - Bus Trip
15403	DMOJ Baltic OI '05 P4 - Ancient Manuscript
15402	DMOJ Baltic OI '05 P3 - Maze

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

15451

DMOJ Baltic OI '13 P4 - Brunhilda's Birthday

15450

DMOJ Baltic OI '13 P3 - Pipes

15449

DMOJ Baltic OI '13 P2 - Palindrome-Free Numbers

15448

DMOJ Baltic OI '13 P1 - Ball Machine

15447

DMOJ Baltic OI '12 P6 - Tiny

15446