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Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the rans 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 s 阅读全文
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Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 题目含义：翻转字符串 阅读全文
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Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Pan 阅读全文
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Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100". 题目含义：将两个字符串进行二进制加减法。 思路：从最后一位开始依次计算，注意进位 阅读全文
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Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 给定两个字符串，判断一个字符串是不是另一个字符串 阅读全文
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给一串只包含有'(', ')', '{', '}', '[' 和']',的字符串，要求判定是否是合法的。 阅读全文
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Write a function to find the longest common prefix string amongst an array of strings. 写一个函数（或方法）来寻找一个字符串数组中的最长公共前缀。 注释 阅读全文
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Given a non-negative integer, you could swap two digits at most once to get the maximum valued number. Return the maximum valued number you could get. 阅读全文
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Given two integers n and k, you need to construct a list which contains n different positive integers ranging from 1 to n and obeys the following requ 阅读全文