Compilare: user.cpp: In function ‘int main()’: user.cpp:44:46: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__gnu_cxx::__alloc_traits<std::allocator<long unsigned int> >::value_type {aka long unsigned int}’ [-Wformat=] fprintf(output, "%llu ", positions[i]); ^ user.cpp:18:9: warning: unused variable ‘numberOfPositionShow’ [-Wunused-variable] int numberOfPositionShow; ^~~~~~~~~~~~~~~~~~~~ user.cpp:28:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%s", first); ^ user.cpp:29:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%s", second); ^