1006 Sign In and Sign Out (25分)

#include <stdio.h>
#include<iostream>
using namespace std;

struct ID
{
    char id_num[16];
    int begin;
    int end;
};

int main()
{
    int m,H,M,S;
    struct ID unlock_id,lock_id,tmp_id;
    unlock_id.begin=99999;
    lock_id.end=-1;
    scanf("%d",&m);
    for(int i=0;i<m;i++)
    {
        scanf("%s",tmp_id.id_num);
        scanf("%d:%d:%d",&H,&M,&S);
        S=H*3600+M*60;
        tmp_id.begin=S;
        scanf("%d:%d:%d",&H,&M,&S);
        S=H*3600+M*60;
        tmp_id.end=S;
        if(tmp_id.begin<unlock_id.begin)
            unlock_id=tmp_id;
        if(tmp_id.end>lock_id.end)
            lock_id=tmp_id;
    }
    cout<<unlock_id.id_num<<" "<<lock_id.id_num<<endl;
    return 0;
}

简单的比大小问题，将时间都换算成秒，进行比较。