Compilare: main.cpp: In function 'std::ostream& operator<<(std::ostream&, const binary_heap&)': main.cpp:28:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 1; i < h.heap.size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In member function 'void binary_heap::sift(int)': main.cpp:58:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | if (pos < 1 || pos >= heap.size()) | ~~~~^~~~~~~~~~~~~~ main.cpp:60:9: warning: unused variable 'son' [-Wunused-variable] 60 | int son, size_ = heap.size() - 1; | ^~~ main.cpp: In member function 'void binary_heap::merge(binary_heap&)': main.cpp:135:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 135 | for (int i = 1; i < other.heap.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~