题解

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll N=1e8+5;
int n,m;
int yearm[15]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int year1,year2,mony1,mony2,day1,day2;
int ans;
void run(int x){
	if(x%4==0&&x%100!=0||x%400==0){
		yearm[2]=29;
	}else{
		yearm[2]=28; 
	}
}
void day(int p,int q,int x,int y){
	for(int i=x;i<=y;i++){
		int sum=p*10000+q*100+i;
		int cnt=0;
		int o=sum;
		while(o){
			cnt*=10;
			cnt+=o%10;
			o/=10;
		}
		if(cnt==sum)	ans++;
	}
}
void mony(int t,int x,int y){
	for(int i=x;i<=y;i++){
		if(t==year1&&i==x){
			day(t,i,day1,yearm[i]);
		}else if(t==year2&&i==y){
			day(t,i,1,day2);
		}else{
			day(t,i,1,yearm[i]);
		}
	}
}
int main(){
	cin>>n>>m;
	day1=n%100;
	n/=100;
	mony1=n%100;
	n/=100;
	year1=n;
	day2=m%100;
	m/=100;
	mony2=m%100;
	m/=100;
	year2=m;
	ans=0;
	for(int i=year1;i<=year2;i++){
		run(i);
		if(i==year1){
			if(year2==i){
				mony(i,mony1,mony2);
			} else{
				mony(i,mony1,12);
			}
		}else if(i==year2){
			mony(i,1,mony2);
		}else{
			mony(i,1,12);
		}
	}
	cout<<ans<<endl;
	return 0;
}