AC

#include<iostream>
int main (){
int n;char c;
stdcin>>n>>c;
for(int i = 0;i < n;i++){
for(int j = 1;j <= n+i;j++){
if(jn-i||jn+i)stdcout<<c;else stdcout<<" ";
}
stdcout<<"\n";
}
for(int i = 1;i < n;i++){
for(int j = 1;j <= 2*n-i;j++){
if(ji+1||jn+n-i-1)stdcout<<c;else stdcout<<" ";
}
std::cout<<"\n";
}
}