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)
6571 Codeforces 1454E: Number of Simple Paths
6570 Codeforces 1454D: Number into Sequence
6569 Codeforces 1454C: Sequence Transformation
6568 Codeforces 1454B: Unique Bid Auction
6567 Codeforces 1454A: Special Permutation
6566 Codeforces 1453F: Even Harder
6565 Codeforces 1453E: Dog Snacks
6564 Codeforces 1453D: Checkpoints
6563 Codeforces 1453C: Triangles
6562 Codeforces 1453B: Suffix Operations
6561 Codeforces 1453A: Cancel the Trains
6560 Codeforces 1452G: Game On Tree
6559 Codeforces 1452F: Divide Powers
6558 Codeforces 1452E: Two Editorials
6557 Codeforces 1452D: Radio Towers
6556 Codeforces 1452C: Two Brackets
6555 Codeforces 1452B: Toy Blocks
6554 Codeforces 1452A: Robot Program
6553 Codeforces 1451F: Nullify The Matrix
6552 Codeforces 1451E2: Bitwise Queries (Hard Version)
6551 Codeforces 1451E1: Bitwise Queries (Easy Version)
6550 Codeforces 1451D: Circle Game
6549 Codeforces 1451C: String Equality
6548 Codeforces 1451B: Non-Substring Subsequence
6547 Codeforces 1451A: Subtract or Divide
6546 Codeforces 1450H2: Multithreading (Hard Version)
6545 Codeforces 1450H1: Multithreading (Easy Version)
6544 Codeforces 1450G: Communism
6543 Codeforces 1450F: The Struggling Contestant
6542 Codeforces 1450E: Capitalism
6541 Codeforces 1450D: Rating Compression
6540 Codeforces 1450C2: Errich-Tac-Toe (Hard Version)
6539 Codeforces 1450C1: Errich-Tac-Toe (Easy Version)
6538 Codeforces 1450B: Balls of Steel
6537 Codeforces 1450A: Avoid Trygub
6536 Codeforces 1447B: Numbers Box
6535 Codeforces 1447A: Add Candies
6534 Codeforces 1446F: Line Distance
6533 Codeforces 1446E: Long Recovery
6532 Codeforces 1446D2: Frequency Problem (Hard Version)
6531 Codeforces 1446D1: Frequency Problem (Easy Version)
6530 Codeforces 1446C: Xor Tree
6529 Codeforces 1446B: Catching Cheaters
6528 Codeforces 1446A: Knapsack
6527 Codeforces 1445B: Elimination
6526 Codeforces 1445A: Array Rearrangment
6525 Codeforces 1444E: Finding the Vertex
6524 Codeforces 1444D: Rectangular Polyline
6523 Codeforces 1444C: Team-Building
6522 Codeforces 1444B: Divide and Sum
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