Compilare: main.cpp: In member function 'void Heap::sift_down(int)': main.cpp:35:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while (2 * i + 1 < heap.size()) | ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:40:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if (r_i < heap.size() && heap[r_i] < heap[l_i]) | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void Heap::remove(int)': main.cpp:67:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(i=0;i<heap.size();i++) | ~^~~~~~~~~~~~