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)
1771 Codeforces 402D: Upgrading Array
1770 Codeforces 402C: Searching for Graph
1769 Codeforces 402B: Trees in a Row
1768 Codeforces 402A: Nuts
1767 Codeforces 401E: Olympic Games
1766 Codeforces 401D: Roman and Numbers
1765 Codeforces 401C: Team
1764 Codeforces 401B: Sereja and Contests
1763 Codeforces 401A: Vanya and Cards
1762 Codeforces 400E: Inna and Binary Logic
1761 Codeforces 400D: Dima and Bacteria
1760 Codeforces 400C: Inna and Huge Candy Matrix
1759 Codeforces 400B: Inna and New Matrix of Candies
1758 Codeforces 400A: Inna and Choose Options
1757 Codeforces 399B: Red and Blue Balls
1756 Codeforces 399A: Pages
1755 Codeforces 398E: Sorting Permutations
1754 Codeforces 398D: Instant Messanger
1753 Codeforces 398C: Tree and Array
1752 Codeforces 398B: Painting The Wall
1751 Codeforces 398A: Cards
1750 Codeforces 397B: On Corruption and Numbers
1749 Codeforces 397A: On Segment's Own Points
1748 Codeforces 396E: On Iteration of One Well-Known Function
1747 Codeforces 396D: On Sum of Number of Inversions in Permutations
1746 Codeforces 396C: On Changing Tree
1745 Codeforces 396B: On Sum of Fractions
1744 Codeforces 396A: On Number of Decompositions into Multipliers
1743 Codeforces 394E: Lightbulb for Minister
1742 Codeforces 394D: Physical Education and Buns
1741 Codeforces 394C: Dominoes
1740 Codeforces 394B: Very Beautiful Number
1739 Codeforces 394A: Counting Sticks
1738 Codeforces 393B: Three matrices
1737 Codeforces 393A: Nineteen
1736 Codeforces 392E: Deleting Substrings
1735 Codeforces 392D: Three Arrays
1734 Codeforces 392C: Yet Another Number Sequence
1733 Codeforces 392B: Tower of Hanoi
1732 Codeforces 392A: Blocked Points
1731 Codeforces 391F3: Stock Trading
1730 Codeforces 391F2: Stock Trading
1729 Codeforces 391F1: Stock Trading
1728 Codeforces 391E2: Three Trees
1727 Codeforces 391E1: Three Trees
1726 Codeforces 391D2: Supercollider
1725 Codeforces 391D1: Supercollider
1724 Codeforces 391C3: The Tournament
1723 Codeforces 391C2: The Tournament
1722 Codeforces 391C1: The Tournament
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