Sign In and Sign Out (25)

#include <iostream>
#include <string>

using namespace std;

int main()
{
    int num;
    string str;
    string mins, maxs;
    string mint, maxt;
    string t_min="23:59:59", t_max="00:00::00";

    cin >> num;
    for (int i = 0; i < num; i++)
    {
        cin >> str >> mint >> maxt;
        if (mint<=t_min)
        {
            t_min = mint;
            mins = str;
        }
        if (maxt>=t_max)
        {
            t_max = maxt;
            maxs = str;
        }
    }

    cout << mins << " " << maxs;
    system("pause");
    return 0;
}