diags

#include <iostream>
#define m 4
using namespace std;

void stampa(string A[m][m],int n)
{
    string s[n];
    for(int i=0;i<n;i++)
    {
        for(int k=0;k<i+1;k++)
        {
            cout<<" " << A[k][i-k];
            s[k]=A[n-1-k][n-i-1+k];
            //cout<<" "<<A[n-1-k][n-i-1+k];
        }
        cout << endl;
        if(i!=(n-1))
        {
            for(int t=0;t<i+1;t++)
            {
                cout<<" "<<s[t];
            }
            cout << endl;
        }

    }
}

int main()
{
    string A[m][m] =
                {{"ab","bc","cd","ef"},
                {"fg","gh","hi","jk"},
                {"ki","lm","mn","no"},
                {"op","pq","qr","rs"}};
    stampa(A,4);
    return 0;
}