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)
2121 Codeforces 492E: Vanya and Field
2120 Codeforces 492D: Vanya and Computer Game
2119 Codeforces 492C: Vanya and Exams
2118 Codeforces 492B: Vanya and Lanterns
2117 Codeforces 492A: Vanya and Cubes
2116 Codeforces 491C: Deciphering
2115 Codeforces 491B: New York Hotel
2114 Codeforces 491A: Up the hill
2113 Codeforces 490F: Treeland Tour
2112 Codeforces 490E: Restoring Increasing Sequence
2111 Codeforces 490D: Chocolate
2110 Codeforces 490C: Hacking Cypher
2109 Codeforces 490B: Queue
2108 Codeforces 490A: Team Olympiad
2107 Codeforces 489F: Special Matrices
2106 Codeforces 489E: Hiking
2105 Codeforces 489D: Unbearable Controversy of Being
2104 Codeforces 489C: Given Length and Sum of Digits...
2103 Codeforces 489B: BerSU Ball
2102 Codeforces 489A: SwapSort
2101 Codeforces 488B: Candy Boxes
2100 Codeforces 488A: Giga Tower
2099 Codeforces 487E: Tourists
2098 Codeforces 487D: Conveyor Belts
2097 Codeforces 487C: Prefix Product Sequence
2096 Codeforces 487B: Strip
2095 Codeforces 487A: Fight the Monster
2094 Codeforces 486E: LIS of Sequence
2093 Codeforces 486D: Valid Sets
2092 Codeforces 486C: Palindrome Transformation
2091 Codeforces 486B: OR in Matrix
2090 Codeforces 486A: Calculating Function
2089 Codeforces 485B: Valuable Resources
2088 Codeforces 485A: Factory
2087 Codeforces 484E: Sign on Fence
2086 Codeforces 484D: Kindergarten
2085 Codeforces 484C: Strange Sorting
2084 Codeforces 484B: Maximum Value
2083 Codeforces 484A: Bits
2082 Codeforces 483B: Friends and Presents
2081 Codeforces 483A: Counterexample
2080 Codeforces 482E: ELCA
2079 Codeforces 482D: Random Function and Tree
2078 Codeforces 482C: Game with Strings
2077 Codeforces 482B: Interesting Array
2076 Codeforces 482A: Diverse Permutation
2075 Codeforces 480E: Parking Lot
2074 Codeforces 480D: Parcels
2073 Codeforces 479E: Riding in a Lift
2072 Codeforces 479D: Long Jumps
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