https://www.acmicpc.net/problem/2443
#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
for(int i=n;i>=1;i--){
for(int j=0;j<n-i;j++) cout<<" ";
for(int j=0;j<(i-1)*2+1;j++) cout<<"*";
cout<<"\n";
}
}