Compilare: user.cpp: In function ‘int main()’: user.cpp:36:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] fprintf(fout,"%s",feedback[uf_united(x,y)]); ^ user.cpp:24:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n_numbers,&n_op); ^ user.cpp:31:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&op,&x,&y); ^