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LeetCode#592. Fraction Addition and Subtraction Level: Medium Given a string expression representing an expression of fraction addition and subtraction, return the calculation result in string format. The ...

Level : Medium Alice and Bob continue their games with piles of stones.  There are a number of piles arranged in a row, and each pile has a ...

LeetCode#650. 2 Keys Keyboard Level : Medium There is only one character 'A' on the screen of a notepad. You can perform one of two operations on ...

LeetCode #1937. Maximum Number of Points with Cost Level: Medium You are given an m x n integer matrix points (0-indexed). Starting with 0 points, you want to maximize the number of points ...