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)
1351	Codeforces 300B: Coach
1350	Codeforces 300A: Array
1349	Codeforces 299B: Ksusha the Squirrel
1348	Codeforces 299A: Ksusha and Array
1347	Codeforces 298B: Sail
1346	Codeforces 298A: Snow Footprints
1345	Codeforces 297E: Mystic Carvings
1344	Codeforces 297D: Color the Carpet
1343	Codeforces 297C: Splitting the Uniqueness
1342	Codeforces 297B: Fish Weight
1341	Codeforces 297A: Parity Game
1340	Codeforces 296B: Yaroslav and Two Strings
1339	Codeforces 296A: Yaroslav and Permutations
1338	Codeforces 295E: Yaroslav and Points
1337	Codeforces 295D: Greg and Caves
1336	Codeforces 295C: Greg and Friends
1335	Codeforces 295B: Greg and Graph
1334	Codeforces 295A: Greg and Array
1333	Codeforces 294E: Shaass the Great
1332	Codeforces 294D: Shaass and Painter Robot
1331	Codeforces 294C: Shaass and Lights
1330	Codeforces 294B: Shaass and Bookshelf
1329	Codeforces 294A: Shaass and Oskols
1328	Codeforces 293E: Close Vertices
1327	Codeforces 293D: Ksusha and Square
1326	Codeforces 293C: Cube Problem
1325	Codeforces 293B: Distinct Paths
1324	Codeforces 293A: Weird Game
1323	Codeforces 292E: Copying Data
1322	Codeforces 292D: Connected Components
1321	Codeforces 292C: Beautiful IP Addresses
1320	Codeforces 292B: Network Topology
1319	Codeforces 292A: SMSC
1318	Codeforces 291E: Tree-String Problem
1317	Codeforces 291D: Parallel Programming
1316	Codeforces 291C: Network Mask
1315	Codeforces 291B: Command Line Arguments
1314	Codeforces 291A: Spyke Talks
1313	Codeforces 290F: Greedy Petya
1312	Codeforces 290E: HQ
1311	Codeforces 290D: Orange
1310	Codeforces 290C: WTF?
1309	Codeforces 290B: QR code
1308	Codeforces 290A: Mysterious strings
1307	Codeforces 289B: Polo the Penguin and Matrix
1306	Codeforces 289A: Polo the Penguin and Segments
1305	Codeforces 288E: Polo the Penguin and Lucky Numbers
1304	Codeforces 288D: Polo the Penguin and Trees
1303	Codeforces 288C: Polo the Penguin and XOR operation
1302	Codeforces 288B: Polo the Penguin and Houses

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

1351

Codeforces 300B: Coach

1350

Codeforces 300A: Array

1349

Codeforces 299B: Ksusha the Squirrel

1348

Codeforces 299A: Ksusha and Array

1347

Codeforces 298B: Sail

1346