Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:43:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<neighbors[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:21:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&V,&E,&X,&Y); ^ user.cpp:25:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&left,&right,&dist); ^