简简单单

#include<iostream>
using namespace std;
int main(){
    int a;
    cin>>a;
    for(int i=1;i<=a;i++){
        for(int j=1;j<=a-i;j++){
            cout<<" ";
        }
        for(int j=1;j<=(i+1)*2-1;j++){
            cout<<"*";
        }
        cout<<"\n";
    }
}