View Compilation Error

0_0_20031062_24033.cpp: In function 'long long int read()':
0_0_20031062_24033.cpp:33:19: error: 'getchar_unlocked' was not declared in this scope
  while((c=getchar())<'0'||c>'9');
                   ^
0_0_20031062_24033.cpp:35:19: error: 'getchar_unlocked' was not declared in this scope
  while((c=getchar())>='0'&&c<='9')x=x*10+c-48;
                   ^