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)
5521 Codeforces 1250B: The Feast and the Bus
5520 Codeforces 1250A: Berstagram
5519 Codeforces 1249F: Maximum Weight Subset
5518 Codeforces 1249E: By Elevator or Stairs?
5517 Codeforces 1249D2: Too Many Segments (hard version)
5516 Codeforces 1249D1: Too Many Segments (easy version)
5515 Codeforces 1249C2: Good Numbers (hard version)
5514 Codeforces 1249C1: Good Numbers (easy version)
5513 Codeforces 1249B2: Books Exchange (hard version)
5512 Codeforces 1249B1: Books Exchange (easy version)
5511 Codeforces 1249A: Yet Another Dividing into Teams
5510 Codeforces 1248D1: The World Is Just a Programming Task (Easy Version)
5509 Codeforces 1248B: Grow The Tree
5508 Codeforces 1248A: Integer Points
5507 Codeforces 1246F: Cursor Distance
5506 Codeforces 1245F: Daniel and Spring Cleaning
5505 Codeforces 1245E: Hyakugoku and Ladders
5504 Codeforces 1245D: Shichikuji and Power Grid
5503 Codeforces 1245C: Constanze's Machine
5502 Codeforces 1245B: Restricted RPS
5501 Codeforces 1245A: Good ol' Numbers Coloring
5500 Codeforces 1244G: Running in Pairs
5499 Codeforces 1244F: Chips
5498 Codeforces 1244E: Minimizing Difference
5497 Codeforces 1244D: Paint the Tree
5496 Codeforces 1244C: The Football Season
5495 Codeforces 1244B: Rooms and Staircases
5494 Codeforces 1244A: Pens and Pencils
5493 Codeforces 1243B2: Character Swap (Hard Version)
5492 Codeforces 1243B1: Character Swap (Easy Version)
5491 Codeforces 1243A: Maximum Square
5490 Codeforces 1242E: Planar Perimeter
5489 Codeforces 1242D: Number Discovery
5488 Codeforces 1242C: Sum Balance
5487 Codeforces 1242B: 0-1 MST
5486 Codeforces 1242A: Tile Painting
5485 Codeforces 1240F: Football
5484 Codeforces 1239F: Swiper, no swiping!
5483 Codeforces 1239E: Turtle
5482 Codeforces 1239D: Catowice City
5481 Codeforces 1239C: Queue in the Train
5480 Codeforces 1239B: The World Is Just a Programming Task (Hard Version)
5479 Codeforces 1239A: Ivan the Fool and the Probability Theory
5478 Codeforces 1238G: Adilbek and the Watering System
5477 Codeforces 1238F: The Maximum Subtree
5476 Codeforces 1238E: Keyboard Purchase
5475 Codeforces 1238D: AB-string
5474 Codeforces 1238C: Standard Free2play
5473 Codeforces 1238B: Kill `Em All
5472 Codeforces 1238A: Prime Subtraction
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