Compilare: main.cpp: In member function 'void Heap::sift_down(int)': main.cpp:34:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | while (2 * i + 1 < heap.size()) | ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if (r_i < heap.size() && heap[r_i] < heap[l_i]) | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void Heap::remove(int)': main.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int i = 0; i < heap.size(); i++) | ~~^~~~~~~~~~~~~