题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    cout << "      *" << endl;
    cout << "    *   *" << endl;
    cout << "  *       *" << endl;
    cout << "*           *" << endl;
    cout << "  *       *" << endl;
    cout << "    *   *" << endl;
    cout << "      *" << endl;
}