啊吧啊吧

#include<bits/stdc++.h>
using namespace std;
int n,m,a[1145][1145],cnt;
int main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++)
			a[i][j]=++cnt;
	int x=1,y=1;
	cout<<a[x][y];
	a[x][y]=0;
	for(int i=2;i<=n*m;i++)
	{
		while(x+1<=n and a[x+1][y]!=0)
		{
			cout<<","<<a[++x][y];
			a[x][y]=0;
		}
		while(y+1<=m and a[x][y+1]!=0)
		{
			cout<<","<<a[x][++y];
			a[x][y]=0;
		}
		while(x-1>=0 and a[x-1][y]!=0)
		{
			cout<<","<<a[--x][y];
			a[x][y]=0;
		}
		while(y+1>=0 and a[x][y-1]!=0)
		{
			cout<<","<<a[x][--y];
			a[x][y]=0;
		}
	}
}