枚举好题，直接枚举答案 看看在不在范围内就行了 注意二月份

92200229是合法的~

82200228也是合法的！

#include<bits/stdc++.h>
using namespace std;

map<int,int>mp;

int main()
{
	mp[1] = mp[3] = mp[5] = mp[7] = mp[8] = mp[10] = mp[12] = 31;
	mp[2] = 29;
	mp[4] = mp[6] = mp[9] = mp[11] = 30;
	int n,m;cin>>n>>m;
	int res = 0;
	for(auto [x,y]:mp){
		
		for(int j=1;j<=y;j++){
		
		string tem = to_string(x*100+j);
		if(tem.size()<4)tem = '0'+tem;
		string tem1 = tem;
		reverse(tem.begin(),tem.end());
		tem+=tem1;
	//	if(tem[0]=='0')continue;
		int st = stoi(tem);
		
		
		if(st>=n&&st<=m)res++;			
		}

	}
	
	cout<<res;
}