题解

#include <iostream>
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<<" ";
}
for(int j=1;j<=2i-1;j++){
cout<<"";
}
cout<<endl;
}
return 0;
}