优化技巧+常用处理方式

字符串处理

istringstream 根据空格分隔字符串
string转int i = stoi(s)
int转string s = to_string(i)
示例如下

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main(){

    string s = "a 5 *";
    istringstream iss(s);
    string tmp;
    while(iss >> tmp){
        cout << tmp << endl;
    }
    int i;
    i = stoi("1");
    cout << i << endl;
    cout << to_string(i) << endl;
    
    return 0;
}

/* 输出

a
5
*
1
1

*/