螺旋队列问题

#include<iostream>
#include<iomanip>
using namespace std;
#define max(a,b) ((a)>(b) ? (a) : (b))
#define abs(a) ((a)>0 ? (a) : (-a))
int foo(int x, int y)
{
    int t = max(abs(x),abs(y));
    int v;
    int u = 2 * t -1;
    u = u * u;
    if(t == -x)
        v = u + 5 * t -y;
    else if(t == -y)
        v = u + 7 * t +x;
    else if(t == y)
        v = u + 3 * t -x;
    else
        v = u + t + y;
    return v;
}

int main()
{
    int i,j;
    for(i=-4; i <= 4; i++){
        for(j=-4; j <= 4; j++)
            cout<<" "<< setw(5)<<foo(j,i)<<" ";
        cout << endl;
    }
}