错最后三个测试点的代码

#include<bits/stdc++.h>
using namespace std;
int a, b, sum = 0;
int d[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int main(){
	int nian1, nian2;
	cin >> a >> b;
	nian1 = a / 10000;
	nian2 = b / 10000;
	for(int i = nian1; i <= nian2; i++){
		d[4] = 28;
		int y, r;
		int c = (i % 10) * 1000 + (i / 10 % 10) * 100 + (i / 100 % 10) * 10 + i / 1000;
		int huiwen = i * 10000 + c;
		y = c / 100;
		r = c % 100;
		if(a == b && huiwen == a){
			sum++;
			break;
		}
		if(y <= 12 && y > 0){
			if(i % 400 == 0 || (i % 4 == 0 && i % 100 != 0)){
				d[4] = 29;
			}
			if(r <= d[y] && r > 0) sum++;
		}
	}
	cout << sum;
	return 0;
}