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)
9701	AtCoder ABC195: C. Comma
9700	AtCoder ABC195: B. Many Oranges
9699	AtCoder ABC195: A. Health M Death
9698	AtCoder ABC194: F. Digits Paradise in Hexadecimal
9697	AtCoder ABC194: E. Mex Min
9696	AtCoder ABC194: D. Journey
9695	AtCoder ABC194: C. Squared Error
9694	AtCoder ABC194: B. Job Assignment
9693	AtCoder ABC194: A. I Scream
9692	AtCoder ABC193: F. Zebraness
9691	AtCoder ABC193: E. Oversleeping
9690	AtCoder ABC193: D. Poker
9689	AtCoder ABC193: C. Unexpressed
9688	AtCoder ABC193: B. Play Snuke
9687	AtCoder ABC193: A. Discount
9686	AtCoder ABC192: F. Potion
9685	AtCoder ABC192: E. Train
9684	AtCoder ABC192: D. Base n
9683	AtCoder ABC192: C. Kaprekar Number
9682	AtCoder ABC192: B. uNrEaDaBlE sTrInG
9681	AtCoder ABC192: A. Star
9680	AtCoder ABC191: F. GCD or MIN
9679	AtCoder ABC191: E. Come Back Quickly
9678	AtCoder ABC191: D. Circle Lattice Points
9677	AtCoder ABC191: C. Digital Graffiti
9676	AtCoder ABC191: B. Remove It
9675	AtCoder ABC191: A. Vanishing Pitch
9674	AtCoder ABC190: F. Shift and Inversions
9673	AtCoder ABC190: E. Magical Ornament
9672	AtCoder ABC190: D. Staircase Sequences
9671	AtCoder ABC190: C. Bowls and Dishes
9670	AtCoder ABC190: B. Magic 3
9669	AtCoder ABC190: A. Very Very Primitive Game
9668	AtCoder ABC189: F. Sugoroku2
9667	AtCoder ABC189: E. Rotate and Flip
9666	AtCoder ABC189: D. Logical Expression
9665	AtCoder ABC189: C. Mandarin Orange
9664	AtCoder ABC189: B. Alcoholic
9663	AtCoder ABC189: A. Slot
9662	AtCoder ABC188: F. +1-1x2
9661	AtCoder ABC188: E. Peddler
9660	AtCoder ABC188: D. Snuke Prime
9659	AtCoder ABC188: C. ABC Tournament
9658	AtCoder ABC188: B. Orthogonality
9657	AtCoder ABC188: A. Three-Point Shot
9656	AtCoder ABC187: F. Close Group
9655	AtCoder ABC187: E. Through Path
9654	AtCoder ABC187: D. Choose Me
9653	AtCoder ABC187: C. 1-SAT
9652	AtCoder ABC187: B. Gentle Pairs

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

9701

AtCoder ABC195: C. Comma

9700

AtCoder ABC195: B. Many Oranges

9699

AtCoder ABC195: A. Health M Death

9698

AtCoder ABC194: F. Digits Paradise in Hexadecimal

9697

AtCoder ABC194: E. Mex Min

9696