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)
4921 Codeforces 1133A: Middle of the Contest
4920 Codeforces 1132G: Greedy Subsequences
4919 Codeforces 1132F: Clear the String
4918 Codeforces 1132E: Knapsack
4917 Codeforces 1132D: Stressful Training
4916 Codeforces 1132C: Painting the Fence
4915 Codeforces 1132B: Discounts
4914 Codeforces 1132A: Regular Bracket Sequence
4913 Codeforces 1131G: Most Dangerous Shark
4912 Codeforces 1131F: Asya And Kittens
4911 Codeforces 1131E: String Multiplication
4910 Codeforces 1131D: Gourmet choice
4909 Codeforces 1131C: Birthday
4908 Codeforces 1131B: Draw!
4907 Codeforces 1131A: Sea Battle
4906 Codeforces 1130C: Connect
4905 Codeforces 1130B: Two Cakes
4904 Codeforces 1130A: Be Positive
4903 Codeforces 1129E: Legendary Tree
4902 Codeforces 1129D: Isolation
4901 Codeforces 1129C: Morse Code
4900 Codeforces 1129B: Wrong Answer
4899 Codeforces 1129A2: Toy Train
4898 Codeforces 1129A1: Toy Train (Simplified)
4897 Codeforces 1121C: System Testing
4896 Codeforces 1121B: Mike and Children
4895 Codeforces 1121A: Technogoblet of Fire
4894 Codeforces 1120F: Secret Letters
4893 Codeforces 1120E: The very same Munchhausen
4892 Codeforces 1120D: Power Tree
4891 Codeforces 1120C: Compress String
4890 Codeforces 1120B: Once in a casino
4889 Codeforces 1120A: Diana and Liana
4888 Codeforces 1119H: Triple
4887 Codeforces 1119G: Get Ready for the Battle
4886 Codeforces 1119F: Niyaz and Small Degrees
4885 Codeforces 1119E: Pavel and Triangles
4884 Codeforces 1119D: Frets On Fire
4883 Codeforces 1119C: Ramesses and Corner Inversion
4882 Codeforces 1119B: Alyona and a Narrow Fridge
4881 Codeforces 1119A: Ilya and a Colorful Walk
4880 Codeforces 1118F2: Tree Cutting (Hard Version)
4879 Codeforces 1118F1: Tree Cutting (Easy Version)
4878 Codeforces 1118E: Yet Another Ball Problem
4877 Codeforces 1118D2: Coffee and Coursework (Hard Version)
4876 Codeforces 1118D1: Coffee and Coursework (Easy version)
4875 Codeforces 1118C: Palindromic Matrix
4874 Codeforces 1118B: Tanya and Candies
4873 Codeforces 1118A: Water Buying
4872 Codeforces 1117G: Recursive Queries
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