PATTERN

#include <iostream>
using namespace std;
#define n 9
int a[n][n];

int main() {
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            a[i][j] = -1;

    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            if (i == j || n - i - 1 == j) a[i][j] = 0;
            else if (j < n - i - 1) a[i][j] = i + j;
            else a[i][j] = a[i][j - 1] + 1;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cout << a[i][j] << ' ';
        }
        cout << endl;
    }

    return 0;
}