#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>

using namespace std;

int get_seconds(int h,int m,int s)
{
    return h*3600+m*60+s;
}

int get_time()
{
    string line;
    getline(cin,line);

    if(line.back()!=')') line+="(+0)";

    int h1,m1,s1,h2,m2,s2,d;
    sscanf(line.c_str(),"%d:%d:%d %d:%d:%d(+%d)",&h1,&m1,&s1,&h2,&m2,&s2,&d);

    return get_seconds(h2,m2,s2)-get_seconds(h1,m1,s1)+d*24*3600;
}

int main()
{
    int n;
    scanf("%d\n",&n);
    string line;
    //getline(cin,line);
    while(n--)
    {
        int time=(get_time()+get_time())/2;
        int hour=time/3600,minute=time%3600/60,second=time%60;
        printf("%02d:%02d:%02d\n",hour,minute,second);
    }

    return 0;
}
--------这是我抄的y总的代码

#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

int get_seconds(int h, int m, int s)
{
    return h * 3600 + m * 60 + s;
}

int get_time()
{
    string line;
    getline(cin, line);

    if (line.back() != ')') line += " (+0)";

    int h1, m1, s1, h2, m2, s2, d;
    sscanf(line.c_str(), "%d:%d:%d %d:%d:%d (+%d)", &h1, &m1, &s1, &h2, &m2, &s2, &d);

    return get_seconds(h2, m2, s2) - get_seconds(h1, m1, s1) + d * 24 * 3600;
}

int main()
{
    int n;
    scanf("%d", &n);
    string line;
    getline(cin, line);     // 忽略掉第一行的回车
    while (n -- )
    {
        int time = (get_time() + get_time()) / 2;
        int hour = time / 3600, minute = time % 3600 / 60, second = time % 60;
        printf("%02d:%02d:%02d\n", hour, minute, second);
    }

    return 0;
}

这是y总写的，为什么我一一比对感觉都是一样的啊，为什么输出的数据就是错的，不理解