题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=1;i<=n;i++){
for(int j=1;j<=n-i;j++){
cout<<" ";
}
if(i1){
cout<<"";
}else{
cout<<"";
for(int j=1;j<=(i-1)2-1;j++){
cout<<" ";
}
cout<<"";
}
cout<<endl;
}
for(int i=n-1;i>=1;i--){
for(int j=1;j<=n-i;j++){
cout<<" ";
}
if(i1){
cout<<"";
}else{
cout<<"";
for(int j=1;j<=(i-1)2-1;j++){
cout<<" ";
}
cout<<"";
}
cout<<endl;
}
return 0;
}