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题目 An integer array is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the s 阅读全文
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题目 Given a string s, return the longest palindromic substring in s. Example 1: Input: s = "babad" Output: "bab" Explanation: "aba" is also a valid ans 阅读全文
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题目 There is a robot on an m x n grid. The robot is initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom- 阅读全文
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题目 Given an array of non-negative integers nums, you are initially positioned at the first index of the array. Each element in the array represents yo 阅读全文