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)
15751	DMOJ CCC '22 S5 - Good Influencers
15750	DMOJ CCC '22 S4 - Good Triplets
15749	DMOJ CCC '22 S3 - Good Samples
15748	DMOJ CCC '22 S2 - Good Groups
15747	DMOJ CCC '22 S1 - Good Fours and Good Fives
15746	DMOJ CCC '22 J5 - Square Pool
15745	DMOJ CCC '22 J3 - Harp Tuning
15744	DMOJ CCC '22 J2 - Fergusonball Ratings
15743	DMOJ CCC '22 J1 - Cupcake Party
15742	DMOJ CCC '21 S5 - Math Homework
15741	DMOJ CCC '21 S4 - Daily Commute
15740	DMOJ CCC '21 S3 - Lunch Concert
15739	DMOJ CCC '21 S2 - Modern Art
15738	DMOJ CCC '21 S1 - Crazy Fencing
15737	DMOJ CCC '21 J4 - Arranging Books
15736	DMOJ CCC '21 J3 - Secret Instructions
15735	DMOJ CCC '21 J2 - Silent Auction
15734	DMOJ CCC '21 J1 - Boiling Water
15733	DMOJ CCC '20 S5 - Josh's Double Bacon Deluxe
15732	DMOJ CCC '20 S4 - Swapping Seats
15731	DMOJ CCC '20 S3 - Searching for Strings
15730	DMOJ CCC '20 S2 - Escape Room (Hard)
15729	DMOJ CCC '20 S2 - Escape Room
15728	DMOJ CCC '20 S1 - Surmising a Sprinter's Speed
15727	DMOJ CCC '20 J4 - Cyclic Shifts (Hard)
15726	DMOJ CCC '20 J4 - Cyclic Shifts
15725	DMOJ CCC '20 J3 - Art
15724	DMOJ CCC '20 J2 - Epidemiology
15723	DMOJ CCC '20 J1 - Dog Treats
15722	DMOJ CCC '19 S5 - Triangle: The Data Structure
15721	DMOJ CCC '19 S4 - Tourism
15720	DMOJ CCC '19 S3 - Arithmetic Square
15719	DMOJ CCC '19 S2 - Pretty Average Primes
15718	DMOJ CCC '19 S1 - Flipper
15717	DMOJ CCC '19 J5 - Rule of Three
15716	DMOJ CCC '19 J3 - Cold Compress
15715	DMOJ CCC '19 J2 - Time to Decompress
15714	DMOJ CCC '19 J1 - Winning Score
15713	DMOJ CCC '18 S5 - Maximum Strategic Savings
15712	DMOJ CCC '18 S4 - Balanced Trees
15711	DMOJ CCC '18 S3 - RoboThieves
15710	DMOJ CCC '18 S2 - Sunflowers
15709	DMOJ CCC '18 S1 - Voronoi Villages
15708	DMOJ CCC '18 J5 - Choose your own path
15707	DMOJ CCC '18 J3 - Are we there yet?
15706	DMOJ CCC '18 J2 - Occupy parking
15705	DMOJ CCC '18 J1 - Telemarketer or not?
15704	DMOJ CCC '17 S5 - RMT
15703	DMOJ CCC '17 S4 - Minimum Cost Flow
15702	DMOJ CCC '17 S3 - Nailed It!

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

15751

DMOJ CCC '22 S5 - Good Influencers

15750

DMOJ CCC '22 S4 - Good Triplets

15749

DMOJ CCC '22 S3 - Good Samples

15748

DMOJ CCC '22 S2 - Good Groups

15747

DMOJ CCC '22 S1 - Good Fours and Good Fives

15746