/in/foo.cc: In function 'int main()':
/in/foo.cc:42:9: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(fa[x] != x) fa[x] = findfa(fa[x]);
     ~~~~^
/in/foo.cc:64:6: note: 'f' was declared here
  int f;
      ^

VJ4Error('ProblemDataNotFoundError', '题目 59a1590ed3d8a11d467bcc95 的数据未找到。', 'xyfJASON', '59a1590ed3d8a11d467bcc95')