practice_3_improved.cpp

#include <iostream>
using namespace std;


int main() {
    int n,ni,i,j;
    bool flip=true;
    cin>>n;
    for(i=0,ni=0;ni<n;ni++,i-=(1-(2*flip)),flip = ((i<n/2)&&flip)){ //loop for every line
        for(j=0;j<(n/2)-i;j++)cout<<' ';                            //spaces
        cout<<(char)(i+65);                                         //left alphabet
        for(j=0;j<(2*i)-1;j++)cout<<'-';                            //middle dashes
        cout<<((i)?((char)(i+65)):'\0')<<endl;                      //right alphabet
    }
    return 0;
}