60分求大佬帮助！

#include<bits/stdc++.h>
using namespace std;
int days[13]={0,31,0,31,30,31,30,31,31,30,31,30,31};
int ans,fy,fm,fd,ly,lm,ld,ny,nm,nd;
bool islow()
{
    if(ny>ly)return 0;
    if(nm>lm)return 0;
    if(nd>ld)return 0;
    return 1;
}
bool hui(int year,int month,int day)
{
    return (year/1000==day%10&&
            year/100%10==day/10&&
            year/10%10==month%10&&
            year%10==month/10);
}
void next_date(int &year,int &month,int &day)
{
    if(month==12&&day==31){year++;month=1;day=1;}
    int da=month==2?((year%4==0&&year%100!=0||year%400==0)?29:28):days[month];
    if(da==day){month++;day=1;}
    else {day++;}
    return;
}
void gethui()
{
    ny=fy,nm=fm,nd=fd;
    while(islow())
    {
        if(hui(ny,nm,nd))ans++;
        next_date(ny,nm,nd);
    }
}
int main(){
    scanf("%4d%2d%2d %4d%2d%2d",&fy,&fm,&fd,&ly,&lm,&ld);
    gethui();
    printf("%d",ans);
    return 0;
}