answer.code:41:11: warning: multi-character character constant [-Wmultichar]
   41 | char buf[2'000'010];
      |           ^~~~~
answer.code:41:11: error: expected ‘]’ before '\x303030'
   41 | char buf[2'000'010];
      |           ^~~~~
      |           ]
answer.code: In function ‘int main()’:
answer.code:50:19: error: ‘buf’ was not declared in this scope
   50 |       scanf("%s", buf);
      |                   ^~~