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)
1921 Codeforces 443B: Kolya and Tandem Repeat
1920 Codeforces 443A: Anton and Letters
1919 Codeforces 442E: Gena and Second Distance
1918 Codeforces 442D: Adam and Tree
1917 Codeforces 442C: Artem and Array
1916 Codeforces 442B: Andrey and Problem
1915 Codeforces 442A: Borya and Hanabi
1914 Codeforces 441E: Valera and Number
1913 Codeforces 441D: Valera and Swaps
1912 Codeforces 441C: Valera and Tubes
1911 Codeforces 441B: Valera and Fruits
1910 Codeforces 441A: Valera and Antique Items
1909 Codeforces 440D: Berland Federalization
1908 Codeforces 440C: One-Based Arithmetic
1907 Codeforces 440B: Balancer
1906 Codeforces 440A: Forgotten Episode
1905 Codeforces 439E: Devu and Birthday Celebration
1904 Codeforces 439D: Devu and his Brother
1903 Codeforces 439C: Devu and Partitioning of the Array
1902 Codeforces 439B: Devu, the Dumb Guy
1901 Codeforces 439A: Devu, the Singer and Churu, the Joker
1900 Codeforces 438E: The Child and Binary Tree
1899 Codeforces 438D: The Child and Sequence
1898 Codeforces 437E: The Child and Polygon
1897 Codeforces 437D: The Child and Zoo
1896 Codeforces 437C: The Child and Toy
1895 Codeforces 437B: The Child and Set
1894 Codeforces 437A: The Child and Homework
1893 Codeforces 436F: Banners
1892 Codeforces 436E: Cardboard Box
1891 Codeforces 436D: Pudding Monsters
1890 Codeforces 436C: Dungeons and Candies
1889 Codeforces 436B: Om Nom and Spiders
1888 Codeforces 436A: Feed with Candy
1887 Codeforces 435E: Special Graph
1886 Codeforces 435D: Special Grid
1885 Codeforces 435C: Cardiogram
1884 Codeforces 435B: Pasha Maximizes
1883 Codeforces 435A: Queue on Bus Stop
1882 Codeforces 434E: Furukawa Nagisa's Tree
1881 Codeforces 434D: Nanami's Power Plant
1880 Codeforces 433E: Tachibana Kanade's Tofu
1879 Codeforces 433D: Nanami's Digital Board
1878 Codeforces 433C: Ryouko's Memory Note
1877 Codeforces 433B: Kuriyama Mirai's Stones
1876 Codeforces 433A: Kitahara Haruki's Gift
1875 Codeforces 432E: Square Tiling
1874 Codeforces 432D: Prefixes and Suffixes
1873 Codeforces 432C: Prime Swaps
1872 Codeforces 432B: Football Kit
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