View Compilation Error

0_0_39797160_10800.cpp: In function 'int read()':
0_0_39797160_10800.cpp:27:11: error: 'getchar_unlocked' was not declared in this scope; did you mean '_getchar_nolock'?
   27 |         c=getchar_unlocked();
      |           ^~~~~~~~~~~~~~~~
      |           _getchar_nolock
0_0_39797160_10800.cpp:33:11: error: 'getchar_unlocked' was not declared in this scope; did you mean '_getchar_nolock'?
   33 |         c=getchar_unlocked();
      |           ^~~~~~~~~~~~~~~~
      |           _getchar_nolock