export default function bfs(head: BinaryNode<number>, needle: number): boolean {
  const q: (BinaryNode<number>|null)[] = [head];
  while(q.length){
    const curr = q.shift() as BinaryNode<number> | undefined | null;
    
    if(!curr){
      continue;
    }
    if (curr.value === needle){
      return true;
    }
    q.push(curr.left);
    q.push(curr.right);
  }
  return false;
}