Compilare: main.cpp: In static member function 'static bool Graf::potiConstruiGraf(std::vector<int>)': main.cpp:221:26: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 221 | if (grade[0] > grade.size() - 1) return false;