Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:17:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Reverse[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:46:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Comp[i].size();j++) ^ user.cpp:33:25: 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:36:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&Y),Graph[X].push_back(Y),Reverse[Y].push_back(X); ^