题目链接：1006 Sign In and Sign Out
#include <iostream>
using namespace std;int main(){int M, in = 240000, out = -1, h, m, s;string id, inid, outid;cin >> M;for(int i = 0; i < M; i++){cin >> id;scanf("%d:%d:%d", &h, &m, &s);s = h * 10000 + m * 100 + s;if(s < in){in = s;inid = id;}scanf("%d:%d:%d", &h, &m, &s);s = h * 10000 + m * 100 + s;if(s > out){out = s;outid = id;}}cout << inid << ' ' << outid;
}