题目描述

blablabla

样例

#include<iostream>
#include<cstdio>
using namespace std;

int days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};

bool check_valid(int n)
{
    int year=n/1000;
    int mon=n%10000/100;
    int day=n%100;
    if(mon<0||mon>12) return false;
    if(day<0||day>days[mon]&&mon!=2) return false;
    int x=0;
    if(mon==2)
    {
        x=year%4==0&&year%100==0||year%400==0;
    }
    if(day>days[mon]+x) return false;
    return true;
}


int main()
{
    int date1,date2,res=0;
    cin>>date1>>date2;  
    for(int i=1000;i<10000;i++)
    {
        int x=i,t=i;
        for(int j=0;j<4;j++)
            x=x*10+t%10,t/=10;
        if(date1<=x&&date2>=x&&check_valid(x)) res++;
    }
    cout<<res<<endl;
    return 0;
}