View Compilation Error

0_0_39622530_18687.cpp: In function 'long long int in()':
0_0_39622530_18687.cpp:11:25: error: 'getchar_unlocked' was not declared in this scope; did you mean '_getchar_nolock'?
   11 |         #define getchar getchar_unlocked
      |                         ^~~~~~~~~~~~~~~~
0_0_39622530_18687.cpp:12:29: note: in expansion of macro 'getchar'
   12 |         int x=0,f=1;char ch=getchar();
      |                             ^~~~~~~