https://ehazi.hu/q/117282

#include <iostream>
#include <iomanip>

#define N 5

using namespace std;

void babra(int a[][N], unsigned n) {
    for(int i = 1; i < n; i++) {
        for(int j = 0; j < i; j++) {
            a[i][j] = a[i-1][j] + 1;
            a[n-1-j][n-1-i] = a[i][j];
        }
    }
}

void kiir(int a[][N], unsigned n) {
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            cout << setw(2) << a[i][j];
        }
        cout << endl;
    }
}

int main() {
    int arr[N][N] = {};

    babra(arr, N);
    kiir(arr, N);

    return 0;
}