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题目 Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example1： & 8195; Input：121 & 阅读全文
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题目 Inplement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the first non wh 阅读全文
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题目 Given a 32 bit signed integer, reverse digits of an integer. Example1: x = 123， return 321 Example2: x = 123，return 321 Example3: x = 120， return 2 阅读全文
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题目 The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed fo 阅读全文
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题目 Given a string s , find the longest palindromic substring in s . You may assume that the maximum length of s is 1000. Example1： & 8195; Input: "bab 阅读全文