View Compilation Error

0_0_39542216_17421.cpp: In function 'long long int read()':
0_0_39542216_17421.cpp:4:17: error: 'getchar_unlocked' was not declared in this scope; did you mean '_getchar_nolock'?
    4 | #define getchar getchar_unlocked
      |                 ^~~~~~~~~~~~~~~~
0_0_39542216_17421.cpp:23:19: note: in expansion of macro 'getchar'
   23 |         char ch = getchar();
      |                   ^~~~~~~