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)
3851	Codeforces 906D: Power Tower
3850	Codeforces 906C: Party
3849	Codeforces 906B: Seating of Students
3848	Codeforces 906A: Shockers
3847	Codeforces 903G: Yet Another Maxflow Problem
3846	Codeforces 903F: Clear The Matrix
3845	Codeforces 903E: Swapping Characters
3844	Codeforces 903D: Almost Difference
3843	Codeforces 903C: Boxes Packing
3842	Codeforces 903B: The Modcrab
3841	Codeforces 903A: Hungry Student Problem
3840	Codeforces 902B: Coloring a Tree
3839	Codeforces 902A: Visiting a Friend
3838	Codeforces 901E: Cyclic Cipher
3837	Codeforces 901D: Weighting a Tree
3836	Codeforces 901C: Bipartite Segments
3835	Codeforces 901B: GCD of Polynomials
3834	Codeforces 901A: Hashing Trees
3833	Codeforces 900E: Maximum Questions
3832	Codeforces 900D: Unusual Sequences
3831	Codeforces 900C: Remove Extra One
3830	Codeforces 900B: Position in Fraction
3829	Codeforces 900A: Find Extra One
3828	Codeforces 899F: Letters Removing
3827	Codeforces 899E: Segments Removal
3826	Codeforces 899D: Shovel Sale
3825	Codeforces 899C: Dividing the numbers
3824	Codeforces 899B: Months and Years
3823	Codeforces 899A: Splitting in Teams
3822	Codeforces 898F: Restoring the Expression
3821	Codeforces 898E: Squares and not squares
3820	Codeforces 898D: Alarm Clock
3819	Codeforces 898C: Phone Numbers
3818	Codeforces 898B: Proper Nutrition
3817	Codeforces 898A: Rounding
3816	Codeforces 897B: Chtholly's request
3815	Codeforces 897A: Scarborough Fair
3814	Codeforces 896E: Welcome home, Chtholly
3813	Codeforces 896D: Nephren Runs a Cinema
3812	Codeforces 896C: Willem, Chtholly and Seniorious
3811	Codeforces 896B: Ithea Plays With Chtholly
3810	Codeforces 896A: Nephren gives a riddle
3809	Codeforces 895E: Eyes Closed
3808	Codeforces 895D: String Mark
3807	Codeforces 895C: Square Subsets
3806	Codeforces 895B: XK Segments
3805	Codeforces 895A: Pizza Separation
3804	Codeforces 894E: Ralph and Mushrooms
3803	Codeforces 894D: Ralph And His Tour in Binary Country
3802	Codeforces 894C: Marco and GCD Sequence

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

3851

Codeforces 906D: Power Tower

3850

Codeforces 906C: Party

3849

Codeforces 906B: Seating of Students

3848

Codeforces 906A: Shockers

3847

Codeforces 903G: Yet Another Maxflow Problem

3846