Compilare: user.cpp: In function ‘int main()’: user.cpp:7:22: warning: variable ‘cn’ set but not used [-Wunused-but-set-variable] long long int n, cn; ^ user.cpp:11:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &n); ^ user.cpp:8:19: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long int x; ^