跟着carl学算法,本系列博客仅做个人记录,建议大家都去看carl本人的博客,写的真的很好的!
代码随想录
LeetCode:344.反转字符串编写一个函数,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 s 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。
示例 1:
输入:s = ["h","e","l","l","o"]
输出:["o","l","l","e","h"]
示例 2:
输入:s = ["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]
双指针,秒了
java
public void reverseString(char[] s) {
int i = 0;
int j = s.length - 1;
while(i < j){
char temp = s[i];
s[i] = s[j];
s[j] = temp;
i++;
j--;
}
}