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这题充分体现了string的方便

#include
   
    using namespace std;#include
    
     int main(){    int n, m;    string t1, t2, t3, t4;    string ptr1, ptr2, ptr3;    while(cin >> n)    {        for(int i = 1; i <= n; i++)        {            cin >> m;            cin >> ptr1 >> t1 >> t2;            ptr2 = ptr1;//开门人证件            ptr3 = ptr1;//关门人证件            t3 = t1;//永远保存最早时间            t4 = t2;//保存最晚时间            for(int j = 2; j <= m; j++)            {                cin >> ptr1 >> t1 >> t2;                                 if(t1 < t3)                     t3 = t1, ptr2 = ptr1;                if(t2 > t4)                    t4 = t2, ptr3 = ptr1;            }            cout << ptr2 << ' ' << ptr3 << endl;        }     }    return 0;}/**************************************************************    Problem: 1013    User: true14fans    Language: C++    Result: Accepted    Time:0 ms    Memory:1520 kb****************************************************************/
    
   

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