code: def traverse_tree(node, arr):
      if node == None:
          return
  
      if arr[0].val < node.val:
          arr[1] = arr[0]
          arr[0] = node
      elif arr[1].val < node.val:
          arr[1] = node
  
      # search left
      traverse_tree(node.left, arr)
      # search right
      traverse_tree(node.right, arr)
  
label_desc: Use image node_id 2 for calling a global function with example usage: traverse_tree(node, arr) without return types