Compilare: user.cpp: In function ‘void downheap(int, std::vector<int>&, std::vector<int>&, std::vector<int>&)’: user.cpp:25:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (left < myV.size() && dist[myV[left]] < dist[myV[curr]]) { ^ user.cpp:29:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (right < myV.size() && dist[myV[right]] < dist[myV[curr]]) { ^