Compilare: user.cpp: In function ‘int main()’: user.cpp:26:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&edges); ^ user.cpp:29:60: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%hd",&x,&vertex.target,&vertex.cost); ^ user.cpp:36:21: warning: ‘neg_cycle’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(!q.empty()&&!neg_cycle) ^