标签:https 输出 oid 一个 配额 假设 col ref wap
编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 char[]
的形式给出。
不要给另外的数组分配额外的空间,你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。
你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。
示例 1:
输入:["h","e","l","l","o"] 输出:["o","l","l","e","h"]
示例 2:
输入:["H","a","n","n","a","h"] 输出:["h","a","n","n","a","H"]
class Solution { public String reverseString(String s) { int i = 0; int j = s.length()-1; char[] ch = s.toCharArray(); while(i<j){ swap(ch,i,j); i++; j--; } return new String(ch); } public void swap(char[] ch,int i,int j){ char temp = ch[i]; ch[i] = ch[j]; ch[j] = temp; } }
标签:https 输出 oid 一个 配额 假设 col ref wap
原文地址:https://www.cnblogs.com/JAYPARK/p/10356464.html