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)
1971 Codeforces 456A: Laptops
1970 Codeforces 455E: Function
1969 Codeforces 455D: Serega and Fun
1968 Codeforces 455C: Civilization
1967 Codeforces 455B: A Lot of Games
1966 Codeforces 455A: Boredom
1965 Codeforces 454B: Little Pony and Sort by Shift
1964 Codeforces 454A: Little Pony and Crystal Mine
1963 Codeforces 453E: Little Pony and Lord Tirek
1962 Codeforces 453D: Little Pony and Elements of Harmony
1961 Codeforces 453C: Little Pony and Summer Sun Celebration
1960 Codeforces 453B: Little Pony and Harmony Chest
1959 Codeforces 453A: Little Pony and Expected Maximum
1958 Codeforces 452F: Permutation
1957 Codeforces 452E: Three strings
1956 Codeforces 452D: Washer, Dryer, Folder
1955 Codeforces 452C: Magic Trick
1954 Codeforces 452B: 4-point polyline
1953 Codeforces 452A: Eevee
1952 Codeforces 451E: Devu and Flowers
1951 Codeforces 451D: Count Good Substrings
1950 Codeforces 451C: Predict Outcome of the Game
1949 Codeforces 451B: Sort the Array
1948 Codeforces 451A: Game With Sticks
1947 Codeforces 450B: Jzzhu and Sequences
1946 Codeforces 450A: Jzzhu and Children
1945 Codeforces 449E: Jzzhu and Squares
1944 Codeforces 449D: Jzzhu and Numbers
1943 Codeforces 449C: Jzzhu and Apples
1942 Codeforces 449B: Jzzhu and Cities
1941 Codeforces 449A: Jzzhu and Chocolate
1940 Codeforces 448E: Divisors
1939 Codeforces 448D: Multiplication Table
1938 Codeforces 448C: Painting Fence
1937 Codeforces 448B: Suffix Structures
1936 Codeforces 448A: Rewards
1935 Codeforces 447B: DZY Loves Strings
1934 Codeforces 447A: DZY Loves Hash
1933 Codeforces 446E: DZY Loves Bridges
1932 Codeforces 446D: DZY Loves Games
1931 Codeforces 446C: DZY Loves Fibonacci Numbers
1930 Codeforces 446B: DZY Loves Modification
1929 Codeforces 446A: DZY Loves Sequences
1928 Codeforces 445B: DZY Loves Chemistry
1927 Codeforces 445A: DZY Loves Chessboard
1926 Codeforces 444E: DZY Loves Planting
1925 Codeforces 444D: DZY Loves Strings
1924 Codeforces 444C: DZY Loves Colors
1923 Codeforces 444B: DZY Loves FFT
1922 Codeforces 444A: DZY Loves Physics
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