Compilare: user.cpp: In function ‘int main()’: user.cpp:12:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld\n",&n); ^ user.cpp:13:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (v+1,1,500000,fin); ^ user.cpp:54:13: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] j/=2; ^