Compilare: main.cpp: In function 'int main()': main.cpp:26:39: warning: format '%Lf' expects argument of type 'long double*', but argument 3 has type '__gnu_cxx::__alloc_traits<std::allocator<double> >::value_type* {aka double*}' [-Wformat=] fscanf(in, "%Lf", &v[i][j]); ^ main.cpp:77:36: 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[i]); ^ main.cpp:22:31: 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:26:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%Lf", &v[i][j]); ^