无

#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
char a='';
for(int i=1;i<=n;i++){
for(int k=1;k<=n-i;k++){
cout<<" ";
}
for(int j=1;j<=2i-1;j++){
if(j1 or j2i-1){
cout<<a;
}else{
cout<<" ";
}
}
cout<<endl;
}
for(int i=n-1;i>=1;i--){
for(int k=1;k<=n-i;k++){
cout<<" ";
}
for(int j=1;j<=2i-1;j++){
if(j1 or j2*i-1){
cout<<a;
}else{
cout<<" ";
}
}
cout<<endl;
}
return 0;
}