Compilare: main.cpp: In function 'int main()': main.cpp:85:31: warning: format '%lf' expects argument of type 'double', but argument 3 has type '__gnu_cxx::__alloc_traits<std::allocator<long double> >::value_type {aka long double}' [-Wformat=] fprintf(out, "%.8lf", x[1]); ^ main.cpp:22:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ main.cpp:27:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d", &a, &b, &c); ^