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最新推荐文章于 2024-07-10 23:54:17 发布

原创最新推荐文章于 2024-07-10 23:54:17 发布 · 258 阅读

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本文介绍了一种在不使用额外空间的情况下，实现字符串反转的算法。该算法通过修改输入字符数组达到原地反转的效果，适用于包含可打印ASCII字符的字符串。文章提供了C++实现的示例代码。

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Reverse String:
Write a function that reverses a string. The input string is given as an array of characters char[].
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
You may assume all the characters consist of printable ascii characters.
Example 1:
Input: [“h”,“e”,“l”,“l”,“o”]
Output: [“o”,“l”,“l”,“e”,“h”]
Example 2:
Input: [“H”,“a”,“n”,“n”,“a”,“h”]
Output: [“h”,“a”,“n”,“n”,“a”,“H”]

Solution:

#include <iostream>
#include <vector>

using namespace std;

class Solution {
public:
    void reverseString(vector<char>& s) {

        int i = 0, j = s.size()-1;
        while ( i < j ){
            swap( s[i], s[j]);
            i++;
            j--;
        }

    }
};