View Compilation Error

0_0_39832439_27362.cpp: In function 'int read()':
0_0_39832439_27362.cpp:6:17: error: 'getchar_unlocked' was not declared in this scope; did you mean '_getchar_nolock'?
    6 |         char ch=getchar_unlocked();
      |                 ^~~~~~~~~~~~~~~~
      |                 _getchar_nolock