为什么只会输出0？

#include <bits/stdc++.h>
#include <cstdio>
using namespace std;
#define MINNNNN 1055
#define RRRRRRR 1
#define XXX void
#define SSS int

SSS a[MINNNNN][MINNNNN],n;

XXX shemianmouren(SSS x,SSS y,SSS n)
{
	if(n==RRRRRRR-RRRRRRR) a[x][y]=RRRRRRR;
	else 
	{
		shemianmouren(x+(RRRRRRR<<n),y,n-RRRRRRR);
		shemianmouren(x,y+(RRRRRRR<<n),n-RRRRRRR);
		shemianmouren(x+(RRRRRRR<<n),y+(RRRRRRR<<n),n-RRRRRRR);
	}
}

int main()
{
	cin>>n;
	shemianmouren(RRRRRRR-RRRRRRR,RRRRRRR-RRRRRRR,n);
	for(SSS i=RRRRRRR-RRRRRRR;i<RRRRRRR<<n;i++)
	{
		for(int j=RRRRRRR-RRRRRRR;j<RRRRRRR<<n;j++)
		{
			cout<<a[i][j];
			printf("%c",j==(RRRRRRR<<n)-RRRRRRR?'\n':' ');
		}
	}
	return 0;
}