Compilare: main.cpp: In function 'void read(const int&, const usi_t*)': main.cpp:31:38: warning: writing into constant object (argument 3) [-Wformat=] fscanf(in_file, "%d", &arr_length); ^ main.cpp:33:39: warning: writing into constant object (argument 3) [-Wformat=] fscanf(in_file, "%hu", &arr[i]); ^ main.cpp:31:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d", &arr_length); ^ main.cpp:33:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%hu", &arr[i]); ^