practice_3.cpp

#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,ni,i,j;
    bool flip=true;
    string str;
    cin>>n;
    for(i=0,ni=0;ni<n;i-=(1-(2*flip)),flip = ((i<n/2)&&flip)){

        for(j=0;j<(n/2)-i;j++)cout<<' ';
        cout<<(char)(i+65);
        if(i){
            str.clear();
            str.resize((2*i)-1);
            std::generate(
                str.begin(),str.end(),
                []()->char{return '-';}
                );
            cout<<str<<(char)(i+65);
        }
        cout<<endl;
    }
    return 0;
}