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效果: TCP/UDP Port FinderPort number or name:Enter port number (e.g. 21), service (e.g. ssh, ftp) or threat (e.g. nimda)Database updated - March 30, 201 阅读全文
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Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return f 阅读全文
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Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Given s = "hello", return "holle". Example 2: Given 阅读全文