LeetCode C++ 345. Reverse Vowels of a String【String】简单

Write a function that takes a string as input and reverse only the vowels of a string.

Example 1:

Input: "hello" Output: "holle"

Example 2:

Input: "leetcode" Output: "leotcede"

Note: The vowels does not include the letter "y" .

题意：编写一个函数，以字符串作为输入，反转该字符串中的元音字母。

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解法

很简单的双指针题目，只是需要注意范围检查和大小写的问题。代码如下：

class Solution { private: bool isvowel(char c) { c = tolower(c); return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'); } public: string reverseVowels(string s) { if (s.size() <= 1) return s; int left = 0, right = s.size() - 1; while (left < right) { while (left < right && !isvowel(s[left])) ++left; while (left < right && !isvowel(s[right])) --right; if (left < right) swap(s[left++], s[right--]); else break; } return s; } };

效率如下：

执行用时：4 ms, 在所有 C++ 提交中击败了99.62% 的用户 内存消耗：7.7 MB, 在所有 C++ 提交中击败了60.21% 的用户