ac+速度快！👍

#include<iostream>
using namespace std;
int main(){
    cout<<"      *\n";//用'\n'速度快
    cout<<"    *   *\n";
    cout<<"  *       *\n";
    cout<<"*           *\n";
    cout<<"  *       *\n";
    cout<<"    *   *\n";
    cout<<"      *\n";
    return 0;
}