计蒜客练习题：水果店（嵌套map）

#include <iostream>
#include <cstring>
#include <map>
using namespace std;
int main()
{
    int n;
    cin >> n;
    map<string,map<string,int> >m;
    string temp1, temp2;
    while (n--)
    {
        int temp3;
        cin >> temp1 >> temp2 >> temp3;
        m[temp2][temp1] += temp3;
    }
    for (map<string, map<string, int> > ::iterator it = m.begin(); it != m.end(); it++)
    {
        cout << it->first <<endl;
        for (map<string, int> :: iterator it2 = it->second.begin(); it2 != it->second.end(); it2++)
        cout << "   |----" << it2->first << "(" << it2->second<<")"<< endl;
    }
    if (n != 0) cout <<endl;
    return 0;
}