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)
5921 Codeforces 1331E: Jordan Smiley
5920 Codeforces 1331D: Again?
5919 Codeforces 1331C: ...And after happily lived ever they
5918 Codeforces 1331B: Limericks
5917 Codeforces 1331A: Is it rated?
5916 Codeforces 1330B: Dreamoon Likes Permutations
5915 Codeforces 1330A: Dreamoon and Ranking Collection
5914 Codeforces 1329E: Dreamoon Loves AA
5913 Codeforces 1329D: Dreamoon Likes Strings
5912 Codeforces 1329C: Drazil Likes Heap
5911 Codeforces 1329B: Dreamoon Likes Sequences
5910 Codeforces 1329A: Dreamoon Likes Coloring
5909 Codeforces 1328F: Make k Equal
5908 Codeforces 1328E: Tree Queries
5907 Codeforces 1328D: Carousel
5906 Codeforces 1328C: Ternary XOR
5905 Codeforces 1328B: K-th Beautiful String
5904 Codeforces 1328A: Divisibility Problem
5903 Codeforces 1327G: Letters and Question Marks
5902 Codeforces 1327F: AND Segments
5901 Codeforces 1327E: Count The Blocks
5900 Codeforces 1327D: Infinite Path
5899 Codeforces 1327C: Game with Chips
5898 Codeforces 1327B: Princesses and Princes
5897 Codeforces 1327A: Sum of Odd Integers
5896 Codeforces 1326G: Spiderweb Trees
5895 Codeforces 1326F2: Wise Men (Hard Version)
5894 Codeforces 1326F1: Wise Men (Easy Version)
5893 Codeforces 1326E: Bombs
5892 Codeforces 1326D2: Prefix-Suffix Palindrome (Hard version)
5891 Codeforces 1326D1: Prefix-Suffix Palindrome (Easy version)
5890 Codeforces 1326C: Permutation Partitions
5889 Codeforces 1326B: Maximums
5888 Codeforces 1326A: Bad Ugly Numbers
5887 Codeforces 1325F: Ehab's Last Theorem
5886 Codeforces 1325E: Ehab's REAL Number Theory Problem
5885 Codeforces 1325D: Ehab the Xorcist
5884 Codeforces 1325C: Ehab and Path-etic MEXs
5883 Codeforces 1325B: CopyCopyCopyCopyCopy
5882 Codeforces 1325A: EhAb AnD gCd
5881 Codeforces 1324F: Maximum White Subtree
5880 Codeforces 1324E: Sleeping Schedule
5879 Codeforces 1324D: Pair of Topics
5878 Codeforces 1324C: Frog Jumps
5877 Codeforces 1324B: Yet Another Palindrome Problem
5876 Codeforces 1324A: Yet Another Tetris Problem
5875 Codeforces 1323B: Count Subrectangles
5874 Codeforces 1323A: Even Subset Sum Problem
5873 Codeforces 1322F: Assigning Fares
5872 Codeforces 1322E: Median Mountain Range
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