Starlight: List of Problems

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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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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
5471 Codeforces 1237H: Balanced Reversals
5470 Codeforces 1237G: Balanced Distribution
5469 Codeforces 1237F: Balanced Domino Placements
5468 Codeforces 1237E: Balanced Binary Search Trees
5467 Codeforces 1237D: Balanced Playlist
5466 Codeforces 1237C2: Balanced Removals (Harder)
5465 Codeforces 1237C1: Balanced Removals (Easier)
5464 Codeforces 1237B: Balanced Tunnel
5463 Codeforces 1237A: Balanced Rating Changes
5462 Codeforces 1236F: Alice and the Cactus
5461 Codeforces 1236E: Alice and the Unfair Game
5460 Codeforces 1236D: Alice and the Doll
5459 Codeforces 1236C: Labs
5458 Codeforces 1236B: Alice and the List of Presents
5457 Codeforces 1236A: Stones
5456 Codeforces 1234F: Yet Another Substring Reverse
5455 Codeforces 1234E: Special Permutations
5454 Codeforces 1234D: Distinct Characters Queries
5453 Codeforces 1234C: Pipes
5452 Codeforces 1234B2: Social Network (hard version)
5451 Codeforces 1234B1: Social Network (easy version)
5450 Codeforces 1234A: Equalize Prices Again
5449 Codeforces 1231E: Middle-Out
5448 Codeforces 1231C: Increasing Matrix
5447 Codeforces 1230B: Ania and Minimizing
5446 Codeforces 1230A: Dawid and Bags of Candies
5445 Codeforces 1228F: One Node is Gone
5444 Codeforces 1228E: Another Filling the Grid
5443 Codeforces 1228D: Complete Tripartite
5442 Codeforces 1228C: Primes and Multiplication
5441 Codeforces 1228B: Filling the Grid
5440 Codeforces 1228A: Distinct Digits
5439 Codeforces 1227G: Not Same
5438 Codeforces 1227F2: Wrong Answer on test 233 (Hard Version)
5437 Codeforces 1227F1: Wrong Answer on test 233 (Easy Version)
5436 Codeforces 1227E: Arson In Berland Forest
5435 Codeforces 1227D2: Optimal Subsequences (Hard Version)
5434 Codeforces 1227D1: Optimal Subsequences (Easy Version)
5433 Codeforces 1227C: Messy
5432 Codeforces 1227B: Box
5431 Codeforces 1227A: Math Problem
5430 Codeforces 1225G: To Make 1
5429 Codeforces 1225F: Tree Factory
5428 Codeforces 1225E: Rock Is Push
5427 Codeforces 1225D: Power Products
5426 Codeforces 1225C: p-binary
5425 Codeforces 1225B2: TV Subscriptions (Hard Version)
5424 Codeforces 1225B1: TV Subscriptions (Easy Version)
5423 Codeforces 1225A: Forgetting Things
5422 Codeforces 1223G: Wooden Raft
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