Compilare: user.cpp: In member function ‘void Graph::kruskal()’: user.cpp:97:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < mst_used_edges.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:108:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&numberOfNodes,&numberOfEdges); ^ user.cpp:114:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d",&start,&end,&cost); ^