本题题解

#include <bits/stdc++.h>
using namespace std;
int main()
{
    freopen("main.in","r",stdin);//十年OI一场空，无freopen见祖宗
    freopen("main.out","w",stdout);//同上
    cout << "#include <iostream>\n";
    cout << "using namespace std;\n";
    cout << "int main()\n";
    cout << "{\n";
    cout << "    cout << \"Hello World!\";\n";
    cout << "    return 0;\n";
    cout << "}\n";
    fclose(stdin);//十年OI一场空，忘记fclose见祖宗
    fclose(stdout);//同上
    return 0;
}