code: def buildTree(self, preorder, inorder):
      n = len(inorder)
      inOrderMap = {inorder[i]: i for i in range(n)}
      return self.buildTreeUtil(
          preorder, inorder, inOrderMap, 0, n - 1, 0, n - 1
      )
  
label_desc: Use image node_id 1 for calling the Solution obj's underlying member method code with example usage: obj.buildTree(preorder, inorder) and returns: self