初级算入门_反转字符串
2024-11-04 15:26:49 # 技术笔记

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:

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输入:s = ["h","e","l","l","o"]
输出:["o","l","l","e","h"]

示例 2:

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输入:s = ["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]

提示:

  • 1 <= s.length <= 105
  • s[i] 都是 ASCII 码表中的可打印字符

代码:

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class Solution {
public void reverseString(char[] s) {
char temp;
for(int i =0,j=s.length-1-i;i<=j;i++){
temp=s[i];
s[i]=s[j];
s[j]=temp;
j--;
}
}
}

思路:

没什么思路,双指针,前后替换就行,一眼出结果。