【PAT-甲级】1006-Sign In and Sign Out

At the beginning of every day, the first person who signs in the computer room will unlock the door, and the last one who signs out will lock the door. Given the records of signing in's and out's, you are supposed to find the ones who have unlocked and locked the door on that day.

Input Specification:

Each input file contains one test case. Each case contains the records for one day. The case starts with a positive integer M, which is the total number of records, followed by M lines, each in the format:

ID_number Sign_in_time Sign_out_time

where times are given in the format HH:MM:SS, and ID_number is a string with no more than 15 characters.

Output Specification:

For each test case, output in one line the ID numbers of the persons who have unlocked and locked the door on that day. The two ID numbers must be separated by one space.

Note: It is guaranteed that the records are consistent. That is, the sign in time must be earlier than the sign out time for each person, and there are no two persons sign in or out at the same moment.

Sample Input:

3
CS301111 15:30:28 17:00:10
SC3021234 08:00:00 11:25:25
CS301133 21:45:00 21:58:40

Sample Output:

SC3021234 CS301133

AC代码：

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
struct P
{
	string name;
	string t1;
	string t2;
};
int main() {
	vector<P> v;
	int x;
	cin >> x;
	P p;
	while (x--) {
		cin >> p.name >> p.t1 >> p.t2;
		v.push_back(p);
	}
	sort(v.begin(), v.end(), [](const P p1, const P p2) {return p1.t1 < p2.t1; });
	cout << v[0].name << " ";
	sort(v.begin(), v.end(), [](const P p1, const P p2) {return p1.t2 > p2.t2; });
	cout << v[0].name;
	return 0;
}

 某柳姓玩家的代码：

#include <iostream>
#include <climits>
using namespace std;
int main() {
    int n, minn = INT_MAX, maxn = INT_MIN;
    scanf("%d", &n);
    string unlocked, locked;
    for(int i = 0; i < n; i++) {
        string t;
        cin >> t;
        int h1, m1, s1, h2, m2, s2;
        scanf("%d:%d:%d %d:%d:%d", &h1, &m1, &s1, &h2, &m2, &s2);
        int tempIn = h1 * 3600 + m1 * 60 + s1;
        int tempOut = h2 * 3600 + m2 * 60 + s2;
        if (tempIn < minn) {
            minn = tempIn;
            unlocked = t;
        }
        if (tempOut > maxn) {
            maxn = tempOut;
            locked = t;
        }
    }
    cout << unlocked << " " << locked;
    return 0;
}

想的简单点，其实就是给出一些xx::xx::xx 的时间格式，让你判断哪个时间更早，哪个时间更晚，完全可以用string保存，然后直接比较。是可以比较成功的，当然也可以换算为秒（s）