Compilare: main.cpp: In member function 'void Heap::heapify_down(int)': main.cpp:55:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (left_child >= 0 && left_child < h.size() && h[left_child] < h[small]) | ~~~~~~~~~~~^~~~~~~~~~ main.cpp:60:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | if (right_child >= 0 && right_child < h.size() && h[right_child] < h[small]) | ~~~~~~~~~~~~^~~~~~~~~~