【LeetCode】345. Reverse Vowels of a String 解题报告

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Subject

出处：https://leetcode.com/problems/reverse-vowels-of-a-string/

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 = “leetcode”, return “leotcede”.

Explain

该题目的意思是反转一个字符串中的元音字母。第一个和最后一个元音字母交换，第二个和倒数第二个交换……

My Solution

首先定义一个方法去判断一个char字符是否是元音字母。然后通过首尾两个”指针”，当前后两个字符都是元音字符的时候才进行交换，否则将不是元音字符的指针向前或者向后移动。

跳出条件就是start < end。

    /*** * @param c* @return*/public static boolean checkVowel(char c) {if ('a' == c || 'e' == c || 'i' == c || 'o' == c || 'u' == c|| 'A' == c || 'E' == c || 'I' == c || 'O' == c || 'U' == c) {return true;}return false;}/*** * @param s* @return*/public static String reverseVowels(String s) {char[] ch = s.toCharArray();int start = 0;int end = ch.length - 1;char temp;while (start < end) {if (checkVowel(ch[start]) && checkVowel(ch[end])) {temp = ch[end];ch[end] = ch[start];ch[start] = temp;start++;end--;} else {if (!checkVowel(ch[start])) {start++;}if (!checkVowel(ch[end])) {end--;}}}return new String(ch);}

so easy~

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【LeetCode】345. Reverse Vowels of a String 解题报告

Subject

Explain

My Solution

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