#include<stdio.h>
void main()
{
cout<<"*"<<endl;
cout<<"**"<<endl;
cout<<"***"<<endl;
cout<<"****"<<endl;
cout<<"*****"<<endl;
cout<<"****"<<endl;
cout<<"***"<<endl;
cout<<"**"<<endl;
cout<<"*"<<endl;
}

這樣就好啦
(一切從簡啦)