Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:16:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[nod].size(); i++) ^ user.cpp:15:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 1; ^ user.cpp: In function ‘int main()’: user.cpp:39:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.cpp:42:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&x,&y); ^