p10.cc

#include<iostream>
using namespace std;
int main()
{
    int n = 0,k = 0;
    cout<<"enter the n number :" ;
    cin>>n;
    for(int i=1;i<=n*2-1;i++) {
         (i<=n) ? k = n-i+1 : k++;
        for(int j=1;j<=n;j++) {
            if(j<=k)
                {
                    if((i+j) % 2 == 0)
                        cout<<(char)(64+j)<<" ";
                    else
                        cout<<(j)<<" ";
                }
            else
                cout<<" ";
        }
        cout<<endl;
    }
    return 0;
}


//
//A 2 C 4 E 6 G
//1 B 3 D 5 F
//A 2 C 4 E
//1 B 3 D
//A 2 C
//1 B
//A
//1 B
//A 2 C
//1 B 3 D
//A 2 C 4 E
//1 B 3 D 5 F
//A 2 C 4 E 6 G