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)
9251	AtCoder ABC117: C. Streamline
9250	AtCoder ABC117: B. Polygon
9249	AtCoder ABC117: A. Entrance Examination
9248	AtCoder ABC116: D. Various Sushi
9247	AtCoder ABC116: C. Grand Garden
9246	AtCoder ABC116: B. Collatz Problem
9245	AtCoder ABC116: A. Right Triangle
9244	AtCoder ABC115: D. Christmas
9243	AtCoder ABC115: C. Christmas Eve
9242	AtCoder ABC115: B. Christmas Eve Eve
9241	AtCoder ABC115: A. Christmas Eve Eve Eve
9240	AtCoder ABC114: D. 756
9239	AtCoder ABC114: C. 755
9238	AtCoder ABC114: B. 754
9237	AtCoder ABC114: A. 753
9236	AtCoder ABC113: D. Number of Amidakuji
9235	AtCoder ABC113: C. ID
9234	AtCoder ABC113: B. Palace
9233	AtCoder ABC113: A. Discount Fare
9232	AtCoder ABC112: D. Partition
9231	AtCoder ABC112: C. Pyramid
9230	AtCoder ABC112: B. Time Limit Exceeded
9229	AtCoder ABC112: A. Programming Education
9228	AtCoder ABC111: B. AtCoder Beginner Contest 111
9227	AtCoder ABC111: A. AtCoder Beginner Contest 999
9226	AtCoder ABC110: D. Factorization
9225	AtCoder ABC110: C. String Transformation
9224	AtCoder ABC110: B. 1 Dimensional World's Tale
9223	AtCoder ABC110: A. Maximize the Formula
9222	AtCoder ABC109: D. Make Them Even
9221	AtCoder ABC109: C. Skip
9220	AtCoder ABC109: B. Shiritori
9219	AtCoder ABC109: A. ABC333
9218	AtCoder ABC108: B. Ruined Square
9217	AtCoder ABC108: A. Pair
9216	AtCoder ABC107: B. Grid Compression
9215	AtCoder ABC107: A. Train
9214	AtCoder ABC106: D. AtCoder Express 2
9213	AtCoder ABC106: C. To Infinity
9212	AtCoder ABC106: B. 105
9211	AtCoder ABC106: A. Garden
9210	AtCoder ABC105: D. Candy Distribution
9209	AtCoder ABC105: C. Base -2 Number
9208	AtCoder ABC105: B. Cakes and Donuts
9207	AtCoder ABC105: A. AtCoder Crackers
9206	AtCoder ABC104: D. We Love ABC
9205	AtCoder ABC104: C. All Green
9204	AtCoder ABC104: B. AcCepted
9203	AtCoder ABC104: A. Rated for Me
9202	AtCoder ABC103: D. Islands War

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

9251

AtCoder ABC117: C. Streamline

9250

AtCoder ABC117: B. Polygon

9249

AtCoder ABC117: A. Entrance Examination

9248

AtCoder ABC116: D. Various Sushi

9247

AtCoder ABC116: C. Grand Garden

9246