73 Orz

#include<bits/stdc++.h>
using namespace std;
int ans=0;
int month_day[13]=
{
    0,31,28,31,30,31,30,31,31,30,31,30,31   
};
string date1,date2;
int year_1,month_1,day_1;
int year_2,month_2,day_2;
int year_now,month_now,day_now;
void inpt()
{
    cin>>date1>>date2;
    year_1=(date1[0]-'0')*1000+(date1[1]-'0')*100+(date1[2]-'0')*10+(date1[3]-'0');
    month_1=(date1[4]-'0')*10+(date1[5]-'0');
    day_1=(date1[6]-'0')*10+(date1[7]-'0');
    year_2=(date2[0]-'0')*1000+(date2[1]-'0')*100+(date2[2]-'0')*10+(date2[3]-'0');
    month_2=(date2[4]-'0')*10+(date2[5]-'0');
    day_2=(date2[6]-'0')*10+(date2[7]-'0');
    year_now=year_1;
    month_now=month_1;
    day_now=day_1;
}
bool pd(int year)
{
    if(year%4==0)
    {
        if(year%100==0)
        {
            if(year%400==0)
            {
                return true;
            }
            return false;
        }
        return true;
    }
    return false;
}
void dfs(int year,int month,int day)
{
    if(month!=2)
    {
        if(day>month_day[month])
        {
            day-=month_day[month];
            month++;
        }
    }else
    {
        if(pd(year))
        {
            if(day>29)
            {
                day-=29;
                month++;
            }   
        }else
        {
            if(day>28)
            {
                day-=28;
                month++;
            }
        }
    }
    if(month>12)
    {
        year++;
        month-=12;
    }
    if(year==year_2&&month==month_2&&day==day_2) return;
    int day_dl=(day%10)*10+(day/10%10);
    int month_dl=(month%10)*10+(month/10%10);
    int year_zh=day_dl*100+month_dl;
    if(year==year_zh) ans++;
    dfs(year,month,day+1);
}
int main()
{
    inpt();
    dfs(year_now,month_now,day_now);
    printf("%d",ans);
}