https://www.acmicpc.net/problem/10991
#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
for(int i=1;i<=n;i++){
for(int j=n-i;j>0;j--) cout<<" ";
cout<<"*";
if(i!=1) for(int j=0;j<i-1;j++) cout<<" *";
cout<<"\n";
}
}