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[LeetCode] 344. 反转字符串 #91

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Animenzzzz opened this issue Sep 14, 2019 · 0 comments
Open

[LeetCode] 344. 反转字符串 #91

Animenzzzz opened this issue Sep 14, 2019 · 0 comments

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@Animenzzzz
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题目描述:

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"]

解题思路:头尾两个指针,相互交换值

C++解题:

class Solution {
public:
    void reverseString(vector<char>& s) {
        int left = 0,right = s.size() - 1;
        while(left < right){
            swap(s[left],s[right]);
            left++;right--;
        }
    }
};
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