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)
8601 Codeforces 1816B: Grid Reconstruction
8600 Codeforces 1816A: Ian Visits Mary
8599 Codeforces 1815F: OH NO1 (-2-3-4)
8598 Codeforces 1815E: Bosco and Particle
8597 Codeforces 1815D: XOR Counting
8596 Codeforces 1815C: Between
8595 Codeforces 1815B: Sum Graph
8594 Codeforces 1815A: Ian and Array Sorting
8593 Codeforces 1814F: Communication Towers
8592 Codeforces 1814E: Chain Chips
8591 Codeforces 1814D: Balancing Weapons
8590 Codeforces 1814C: Search in Parallel
8589 Codeforces 1814B: Long Legs
8588 Codeforces 1814A: Coins
8587 Codeforces 1812J: Unmysterious Language
8586 Codeforces 1812I: Mountain Climber
8585 Codeforces 1812H: Expected Twist
8584 Codeforces 1812G: Colour Vision
8583 Codeforces 1812F: Factorization
8582 Codeforces 1812E: Not a Geometry Problem
8581 Codeforces 1812D: Trivial Conjecture
8580 Codeforces 1812C: Digits
8579 Codeforces 1812B: Was it Rated?
8578 Codeforces 1812A: Are You a Robot?
8577 Codeforces 1811G2: Vlad and the Nice Paths (hard version)
8576 Codeforces 1811G1: Vlad and the Nice Paths (easy version)
8575 Codeforces 1811F: Is It Flower?
8574 Codeforces 1811E: Living Sequence
8573 Codeforces 1811D: Umka and a Long Flight
8572 Codeforces 1811C: Restore the Array
8571 Codeforces 1811B: Conveyor Belts
8570 Codeforces 1811A: Insert Digit
8569 Codeforces 1810H: Last Number
8568 Codeforces 1810G: The Maximum Prefix
8567 Codeforces 1810F: M-tree
8566 Codeforces 1810E: Monsters
8565 Codeforces 1810D: Climbing the Tree
8564 Codeforces 1810C: Make It Permutation
8563 Codeforces 1810B: Candies
8562 Codeforces 1810A: Beautiful Sequence
8561 Codeforces 1809G: Prediction
8560 Codeforces 1809F: Traveling in Berland
8559 Codeforces 1809E: Two Tanks
8558 Codeforces 1809D: Binary String Sorting
8557 Codeforces 1809C: Sum on Subarrays
8556 Codeforces 1809B: Points on Plane
8555 Codeforces 1809A: Garland
8554 Codeforces 1808E3: Minibuses on Venus (hard version)
8553 Codeforces 1808E2: Minibuses on Venus (medium version)
8552 Codeforces 1808E1: Minibuses on Venus (easy version)
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