很简单

#include <iostream>
using namespace std;
int main() {
long long a,b,c,d;
cin >>a>>b>>c>>d;
if ((a<=c&&b>=d)||(c<=a&&d>=b)) {
cout << "Nested";
}
else if (a<=c&&b>=c||b>=d&&a<=d||c<=a&&d>=a||d>=b&&c<=b) {
cout << "Overlap";
}else {
cout << "Disjoint";
}
return 0;
}