Compilare: user.cpp: In function ‘int main()’: user.cpp:61:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<neighbors[v].size();i++) ^ user.cpp:42:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&V,&E); ^ user.cpp:45:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&edges[i].src,&edges[i].dst,&edges[i].cost); ^