为什么错了

#include<bits/stdc++.h>
using namespace std;
int mark(int x)
{
	int y=x,z=0;
	while(y!=0)
	{
		z=z*10+(y%10);
		y=y/10;
	}
	if(z==x)
	{
		return 1;
	}
	return 0;
}
int main() 
{
	int n,m,w=0;
	cin>>n>>m;
	int nx,ny,nz,mx,my,mz,ax,ay,az,bx,by,bz;
	nz=n%100;
	n=n/100;
	ny=n%100;
	n=n/100;
	ax=nx=n%10000;
	n=n/10000;
	mz=m%100;
	m=m/100;
	my=m%100;
	m=m/100;
	bx=mx=m%10000;
	m=m/10000;
	for(int j=ax;j<=bx;j++)
	{
		if(j==ax)
		{
			ay=ny;
			by=12;
		}
		else
		{
			ay=1;
			by=12;
		}
		if(j==ay)
		{
			ay=1;
			by=my;
		}
		else
		{
			ay=1;
			by=12;
		}
		for(int i=ay;i<=by;i++)
		{
			if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
			{
				az=1;
				bz=31;
			}
			if(i==4||i==6||i==7||i==8||i==9||i==11)
			{
				az=1;
				bz=30;
			}
			if(i==2)
			{
				if((j%400==0)||(j%4==0&&j%100!=0))
				{
					az=1;
					bz=29;
				}
				else
				{
					az=1;
					bz=28;
				}
			}
			if(i==ax&&i==ay)
			{
				az=nz;
			}
			if(i==bx&&i==by)
			{
				bz=mz;
			}
			for(int k=az;k<=bz;k++)
			{
				if(mark(k+i*100+j*10000))
				{
					w++;
				}
			}
		}
	}
	cout<<w<<endl;
    return 0;
}