要不要把闰秒也考虑进去？(doge)

#include<iostream>
using namespace std;
int a[14] = {0, 1, -2, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1};
int day(bool r, int m1, int d1, int m2, int d2){
    int ans;
    if(r)a[2] = -1;
    else a[2] = -2;
    ans = (m2-m1)*30+d2-d1;
    for(int i = m1; i < m2; i++)ans += a[i];
    return ans;
}
bool run(int y){
    return ((y % 400 == 0) || ((y & 3) == 0 && !(y % 100 == 0)));
}
int main(){
    ios::sync_with_stdio(false);
    int y1, m1, d1, h1, min1, s1, y2, m2, d2, h2, min2, s2, cnt = 0, days;
    cin >> y1 >> m1 >> d1 >> h1 >> min1 >> s1 >> y2 >> m2 >> d2 >> h2 >> min2 >> s2;
    for(int i = y1; i <= y2; i++){
        if(run(i))cnt++;
    }
    days = (y2-y1+1)*365 + cnt - day(run(y1), 1, 1, m1, d1) - day(run(y2), m2, d2, 12, 31) - 1;
    cout << days*86400 - (3600*h1+60*min1+s1) + (3600*h2+60*min2+s2);
}

#include <iostream>
using namespace std;
class DateTime
{
    int year, month, day, hour, minute, second;
public:
    void init(int y, int mon, int d, int h, int min, int s)
    {

        year = y;
        month = mon;
        day = d;
        hour = h;
        minute = min;
        second = s;
    }
    int isLeapYear()
    {
        if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
            return 1;
        else
            return 0;
    }
    int isLeapYear(int i)
    {
        if (i % 400 == 0 || (i % 4 == 0 && i % 100 != 0))
            return 1;
        else
            return 0;
    }
    int daytoBegin()
    {
        int Month[13] = { 0,31,28 + isLeapYear(),31,30,31,30,31,31,30,31,30,31 };
        if (month == 1)
            return day;
        int ans = day;
        while (month > 1)
        {
            ans += Month[month - 1];
            month--;
        }
        return ans;
    }
    int secondtoBegin()
    {
        return 60 * 60 * 24 * daytoBegin() - (60 - second) - 60 * (59 - minute) - 60 * 60 * (23 - hour);
    }
    int GapYearSecond(int y)
    {
        if (y - year >= 1)
        {
            int ans = 365 * (y - year - 1);
            for (int i = year + 1; i < y; i++)
            {
                if (isLeapYear(i))
                    ans++;
            }
            return ans * 60 * 60 * 24;
        }
        else
        {
            return -(365 + isLeapYear(year)) * 60 * 60 * 24;
        }
    }
};
int isLeapYear(int i)
{
    if (i % 400 == 0 || (i % 4 == 0 && i % 100 != 0))
        return 1;
    else
        return 0;
}
int main()
{
    int y1, mon1, d1, h1, min1, s1;
    cin >> y1 >> mon1 >> d1 >> h1 >> min1 >> s1;
    int y2, mon2, d2, h2, min2, s2;
    cin >> y2 >> mon2 >> d2 >> h2 >> min2 >> s2;
    DateTime t1, t2;
    t1.init(y1, mon1, d1, h1, min1, s1);
    t2.init(y2, mon2, d2, h2, min2, s2);
    cout << 60 * 60 * 24 * (365 + isLeapYear(y1)) - t1.secondtoBegin() + t1.GapYearSecond(y2) + t2.secondtoBegin();
    return 0;
}

#include <iostream>
using namespace std;
class DateTime
{
int year, month, day, hour, minute, second;
public:
void init(int y, int mon, int d, int h, int min, int s)
{

year = y;
month = mon;
day = d;
hour = h;
minute = min;
second = s;
}
int isLeapYear()
{
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
return 1;
else
return 0;
}
int isLeapYear(int i)
{
if (i % 400 == 0 || (i % 4 == 0 && i % 100 != 0))
return 1;
else
return 0;
}
int daytoBegin()
{
int Month[13] = { 0,31,28 + isLeapYear(),31,30,31,30,31,31,30,31,30,31 };
if (month == 1)
return day;
int ans = day;
while (month > 1)
{
ans += Month[month - 1];
month--;
}
return ans;
}
int secondtoBegin()
{
return 60 * 60 * 24 * daytoBegin() - (60 - second) - 60 * (59 - minute) - 60 * 60 * (23 - hour);
}
int GapYearSecond(int y)
{
if (y - year >= 1)
{
int ans = 365 * (y - year - 1);
for (int i = year + 1; i < y; i++)
{
if (isLeapYear(i))
ans++;
}
return ans * 60 * 60 * 24;
}
else
{
return -(365 + isLeapYear(year)) * 60 * 60 * 24;
}
}
};
int isLeapYear(int i)
{
if (i % 400 == 0 || (i % 4 == 0 && i % 100 != 0))
return 1;
else
return 0;
}
int main()
{
int y1, mon1, d1, h1, min1, s1;
cin >> y1 >> mon1 >> d1 >> h1 >> min1 >> s1;
int y2, mon2, d2, h2, min2, s2;
cin >> y2 >> mon2 >> d2 >> h2 >> min2 >> s2;
DateTime t1, t2;
t1.init(y1, mon1, d1, h1, min1, s1);
t2.init(y2, mon2, d2, h2, min2, s2);
cout << 60 * 60 * 24 * (365 + isLeapYear(y1)) - t1.secondtoBegin() + t1.GapYearSecond(y2) + t2.secondtoBegin();
return 0;
}
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