string字符串转int

题目：次佛锅

string ss;
int a = atoi(ss.c_str());

代码：

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<unordered_map>
#include<sstream>
using namespace std;

unordered_map<string, int> map1;
int main()
{
    int n;
    string  s2, s1, tmp;
    char c;
    getline(cin, s2);
    cin >> n;
    stringstream ss(s2);
    while(ss >> s1)
    {
        if(! isdigit(s1[0]) )
        {
            tmp = s1;
            // cout<<"tmp:"<<tmp;
        }
        else{
            int x = atoi(s1.c_str());
            if(! map1.count(tmp)) map1[tmp] = x;
            else map1[tmp] += x;
            // cout<<"x:"<<x<<endl;
        }
    }

    while(n --)
    {
        string s3;
        cin >> s3;
        cout << map1[s3] << endl;
    }

    return 0;
}