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Description: Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Example 2 阅读全文
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Description: Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the fi 阅读全文
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Description: Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: Note:Assume we are dealing with an environm 阅读全文
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Description: 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 阅读全文