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)
1001	Codeforces 213E: Two Permutations
1000	Codeforces 213D: Stars
999	Codeforces 213C: Relay Race
998	Codeforces 213B: Numbers
997	Codeforces 213A: Game
996	Codeforces 212E: IT Restaurants
995	Codeforces 212D: Cutting a Fence
994	Codeforces 212C: Cowboys
993	Codeforces 212B: Polycarpus is Looking for Good Substrings
992	Codeforces 212A: Privatization
991	Codeforces 209C: Trails and Glades
990	Codeforces 209B: Pixels
989	Codeforces 209A: Multicolored Marbles
988	Codeforces 208E: Blood Cousins
987	Codeforces 208D: Prizes, Prizes, more Prizes
986	Codeforces 208C: Police Station
985	Codeforces 208B: Solitaire
984	Codeforces 208A: Dubstep
983	Codeforces 207D9: The Beaver's Problem - 3
982	Codeforces 207D8: The Beaver's Problem - 3
981	Codeforces 207D7: The Beaver's Problem - 3
980	Codeforces 207D6: The Beaver's Problem - 3
979	Codeforces 207D5: The Beaver's Problem - 3
978	Codeforces 207D4: The Beaver's Problem - 3
977	Codeforces 207D3: The Beaver's Problem - 3
976	Codeforces 207D2: The Beaver's Problem - 3
975	Codeforces 207D10: The Beaver's Problem - 3
974	Codeforces 207D1: The Beaver's Problem - 3
973	Codeforces 207C3: Game with Two Trees
972	Codeforces 207C2: Game with Two Trees
971	Codeforces 207C1: Game with Two Trees
970	Codeforces 207B3: Military Trainings
969	Codeforces 207B2: Military Trainings
968	Codeforces 207B1: Military Trainings
967	Codeforces 207A3: Beaver's Calculator 1.0
966	Codeforces 207A2: Beaver's Calculator 1.0
965	Codeforces 207A1: Beaver's Calculator 1.0
964	Codeforces 205B: Little Elephant and Sorting
963	Codeforces 205A: Little Elephant and Rozdil
962	Codeforces 204E: Little Elephant and Strings
961	Codeforces 204D: Little Elephant and Retro Strings
960	Codeforces 204C: Little Elephant and Furik and Rubik
959	Codeforces 204B: Little Elephant and Cards
958	Codeforces 204A: Little Elephant and Interval
957	Codeforces 203E: Transportation
956	Codeforces 203D: Hit Ball
955	Codeforces 203C: Photographer
954	Codeforces 203B: Game on Paper
953	Codeforces 203A: Two Problems
952	Codeforces 202B: Brand New Easy Problem

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

1001

Codeforces 213E: Two Permutations

1000

Codeforces 213D: Stars

999

Codeforces 213C: Relay Race

998

Codeforces 213B: Numbers

997

Codeforces 213A: Game

996