秀个花式

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

using namespace std;

const static int days[2][12] = {
{31,28,31,30,31,30,31,31,30,31,30,31},
{31,29,31,30,31,30,31,31,30,31,30,31},
};
string s1,s2;

bool isRunYear(int year)
{
if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
return true;
else
return false;
}
int date_date(string s1,string s2)
{
string start = s1 < s2 ? s1 : s2;
string end = s2 > s1 ? s2 : s1;

int startYear,startMonth,startDay;
int endYear,endMonth,endDay;

sscanf(start.c_str(),"%d-%d-%d",&startYear,&startMonth,&startDay);
sscanf(end.c_str(),"%d-%d-%d",&endYear,&endMonth,&endDay);

int day = 0;

for(int y = 1;y < startYear;y++)
    day -= isRunYear(y) ? 366 : 365;

for(int y = 1;y < endYear;y++)
    day += isRunYear(y) ? 366 : 365;

int gap = isRunYear(startYear);
for(int m = 1;m < startMonth;m++)
    day -= days[gap][m-1];

gap = isRunYear(endYear);
for(int m = 1;m < endMonth;m++)
    day += days[gap][m-1];
    
day += endDay - startDay;

if(day < 0) day = 0;
return day;

}
int main()
{
cin >> s1 >> s2;
cout << date_date(s1,s2) << endl;

return 0;

}