1. 具体题目
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"]
2. 思路分析
双指针, 首尾交换
3. 代码
- public void reverseString(char[] s) {
- int left = 0;
- int right = s.length - 1;
- while(left < right){
- char temp = s[left];
- s[left] = s[right];
- s[right] = temp;
- left++;
- right--;
- }
- }
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