Answer 1

#include <iostream>
using namespace std;

int main()
{
char c = 65; //Start_with A.
int i=0;
for(;i<5;i++)
{
for(int j=0;j<i;j++)
{
cout<<c;
c++;
}
cout<<endl;
}
i-=2;
for(;i>0;i--)
{
for(int j=0;j<i;j++)
{
cout<<c;
c++;
}
cout<<endl;
}
return 0;
}

Ill upload a general case for some user input n as well soon.