请问一下这个有什么问题

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

int main()
{
	int n, m, s = 1;
	cin >> n >> m;
	int a[500][500] = { 0 }, b[500][500] = { 0 };
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			a[i][j] = s;
			s++;
		}
	}
	for (int i = 0; i < m; i++)
	{
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < n; j++)
			{
				b[i][j] = a[i][j];
			}
		}
		int x, y, r, z;
		cin >> x >> y >> r >> z;
		for (int j = 0; r > 0; j++)
		{
			if (z == 0)
			{
				a[x - r + j - 1][y - r - 1] = b[x + r - 1][y - r + j - 1];
				a[x + r - 1][y - r + j - 1] = b[x + r - j - 1][y + r - 1];
				a[x + r - j - 1][y + r - 1] = b[x - r - 1][y + r - j - 1];
				a[x - r - 1][y + r - j - 1] = b[x - r + j - 1][y - r - 1];
			}else 
			{
				a[x + r - 1][y - r + j - 1] = b[x - r + j - 1][y - r - 1];
				a[x + r - j - 1][y + r - 1] = b[x + r - 1][y - r + j - 1];
				a[x - r - 1][y + r - j - 1] = b[x + r - j - 1][y + r - 1];
				a[x - r + j - 1][y - r - 1] = b[x - r - 1][y + r - j - 1];
			}
			if (j == r)
			{
				r--;
				j = -1;
			}
		}
	}
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++)
		{
			cout << a[i][j]<<" ";
		}
		cout << endl;
	}
}