Compilare: user.cpp: In function ‘void DFS(int, int*, std::vector<std::pair<int, int> >*)’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:49:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Rev[node].size();j++) ^ user.cpp:36:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&M); ^ user.cpp:40:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d%d",&X,&Y,&C); ^