摘要：
Given n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endp 阅读全文
摘要：
Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'. The matching should cover the entire 阅读全文
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Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Example 2: Example 3: 阅读全文
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Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the first non-white 阅读全文