-D_JUDGE_ -DNDEBUG -O2 -std=c++17
-D_JUDGE_ -DNDEBUG -O2 -std=c++17
.cc
#include <iostream>
using namespace std;
int main()
{
cout << "Hello world!" << endl;
}
#include <iostream>
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
cout << a + b << endl;
}