字符串

string很慢

sstream更慢

应谨慎使用

#include<iostream>
#include<string>
#include<sstream>
using namespace std;
int main()
{
    string line;
    while(getline(cin, line)){
        int sum = 0, x;
        stringstream ss(line);
        while(ss >> x) sum += x;
        cout << sum << "\n";
    }
    return 0;
}