Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:17:36: 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:16:10: warning: unused variable ‘mxm’ [-Wunused-variable] int mxm = 0; ^ user.cpp: In function ‘int main()’: user.cpp:47:9: warning: unused variable ‘grm’ [-Wunused-variable] int grm = 0; ^ user.cpp:46:24: 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:50:34: 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); ^