Compilare: user.cpp: In function ‘int main()’: user.cpp:72:17: warning: unused variable ‘rc’ [-Wunused-variable] int rc = Ancestor(i, v[i]); ^ user.cpp: In function ‘int Ancestor(int, int)’: user.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:45:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^ user.cpp:47:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= N; i++) fscanf(in, "%d", &v[i]); ^ user.cpp:51:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^