Compilare: user.cpp: In function ‘int main()’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( K <= (1LL << (N - 2)) ){ ^ user.cpp:15:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in, "%d", &nr); ^ user.cpp:18:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in, "%d", &N); ^ user.cpp:19:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in, "%Lu", &K); ^