/in/foo.cc: In function 'int query(int, int)':
/in/foo.cc:73:14: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   if (dep[v] - dep[u] & (1 << i))
       ~~~~~~~^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:95:29: error: 'memset' was not declared in this scope
  memset(lst, -1, sizeof(lst)); 
                             ^
/in/foo.cc:100:19: error: 'sort' was not declared in this scope
  sort(arr, arr + m); 
                   ^