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)
3071 Codeforces 725D: Contest Balloons
3070 Codeforces 725C: Hidden Word
3069 Codeforces 725B: Food on the Plane
3068 Codeforces 725A: Jumping Ball
3067 Codeforces 724G: Xor-matic Number of the Graph
3066 Codeforces 724F: Uniformly Branched Trees
3065 Codeforces 724E: Goods transportation
3064 Codeforces 724D: Dense Subsequence
3063 Codeforces 724C: Ray Tracing
3062 Codeforces 724B: Batch Sort
3061 Codeforces 724A: Checking the Calendar
3060 Codeforces 723F: st-Spanning Tree
3059 Codeforces 723E: One-Way Reform
3058 Codeforces 723D: Lakes in Berland
3057 Codeforces 723C: Polycarp at the Radio
3056 Codeforces 723B: Text Document Analysis
3055 Codeforces 723A: The New Year: Meeting Friends
3054 Codeforces 722F: Cyclic Cipher
3053 Codeforces 722E: Research Rover
3052 Codeforces 722D: Generating Sets
3051 Codeforces 722C: Destroying Array
3050 Codeforces 722B: Verse Pattern
3049 Codeforces 722A: Broken Clock
3048 Codeforces 721E: Road to Home
3047 Codeforces 721D: Maxim and Array
3046 Codeforces 721C: Journey
3045 Codeforces 721B: Passwords
3044 Codeforces 721A: One-dimensional Japanese Crossword
3043 Codeforces 720F: Array Covering
3042 Codeforces 720E: Cipher
3041 Codeforces 720D: Slalom
3040 Codeforces 720C: Homework
3039 Codeforces 720B: Cactusophobia
3038 Codeforces 720A: Closing ceremony
3037 Codeforces 719B: Anatoly and Cockroaches
3036 Codeforces 719A: Vitya in the Countryside
3035 Codeforces 718E: Matvey's Birthday
3034 Codeforces 718D: Andrew and Chemistry
3033 Codeforces 718C: Sasha and Array
3032 Codeforces 718A: Efim and Strange Grade
3031 Codeforces 717I: Cowboy Beblop at his computer
3030 Codeforces 717H: Pokermon League challenge
3029 Codeforces 717G: Underfail
3028 Codeforces 717F: Heroes of Making Magic III
3027 Codeforces 717E: Paint it really, really dark gray
3026 Codeforces 717D: Dexterina’s Lab
3025 Codeforces 717C: Potions Homework
3024 Codeforces 717B: R3D3’s Summer Adventure
3023 Codeforces 717A: Festival Organization
3022 Codeforces 716B: Complete the Word
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