Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:14:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:27:26: 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:30:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&val[i]); ^ user.cpp:36:34: 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); ^