344.反转字符串

题目链接:https://leetcode.cn/problems/reverse-string/description/
文章讲解:https://programmercarl.com/0344.%E5%8F%8D%E8%BD%AC%E5%AD%97%E7%AC%A6%E4%B8%B2.html
视频讲解:https://www.bilibili.com/video/BV1fV4y17748/?spm_id_from=333.788&vd_source=e70917aa6392827d1ccc8d85e19e8375
实现情况：

class Solution {
public:void reverseString(vector<char>& s) {for(int  i = 0,j = s.size()-1; i<s.size()/2;i++,j--){swap(s[i],s[j]);}}
};

541. 反转字符串II

题目链接:https://leetcode.cn/problems/reverse-string-ii/description/
文章讲解:https://programmercarl.com/0541.%E5%8F%8D%E8%BD%AC%E5%AD%97%E7%AC%A6%E4%B8%B2II.html
视频讲解:https://www.bilibili.com/video/BV1dT411j7NN/?spm_id_from=333.1007.top_right_bar_window_history.content.click&vd_source=e70917aa6392827d1ccc8d85e19e8375
实现情况：

class Solution {
public:string reverseStr(string s, int k) {for (int i = 0; i < s.size(); i += (2 * k)) {if (i + k < s.size()) {reverse(s.begin() + i, s.begin() + i + k);} else {reverse(s.begin() + i, s.end());}}return s;}
};

卡码网：54.替换数字

题目链接:https://kamacoder.com/problempage.php?pid=1064
文章讲解:https://programmercarl.com/kama54.%E6%9B%BF%E6%8D%A2%E6%95%B0%E5%AD%97.html

实现情况：
主要格式注意

#include <iostream>
#include <vector>  
#include <string> 
using namespace std;int main(void){string s;cin>>s;vector<char> result;for(char c:s){if(c <='z'&& c>='a'){result.push_back(c);}else{for(char nc:string("number")){result.push_back(nc);}}}cout << string(result.begin(), result.end());}