Compilare: user.cpp: In function ‘void sift(std::vector<nod>&, int)’: user.cpp:44:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (heap.size() > getRightSon(k) && (heap[k].val > heap[getRightSon(k)].val || heap[k].val > heap[getLeftSon(k)].val)) ^ user.cpp:55:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (heap.size() == getRightSon(k)) ^ user.cpp: In function ‘int getPos(std::vector<nod>&, int)’: user.cpp:101:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < heap.size(); i++) ^ user.cpp:106:1: warning: control reaches end of non-void function [-Wreturn-type] } ^