Compilare: user.cpp: In function ‘void Sort_Top(int)’: user.cpp:14:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:49:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<R[i].size();j++) ^ user.cpp:31:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&n,&m); ^ user.cpp:33:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&x,&y); ^