Given a binary tree, write a program to determine if the tree is height-balanced.

Problem Note

• A height-balanced binary tree is a binary tree in which the left and right subtrees of every node differ in height by 1 or less than that .
• If the binary tree is height balanced, return 1, else 0.

Example 1

Input: Given binary tree, [1, 2, 3, 4, 5, -1, 6, -1, -1, -1, -1, -1, -1]
    1
   / \
  2   3
 / \   \
4   5   6
Output: 1
Explanation: The difference between the height of left and right subtree is 1 or less than that.

Example 2

Input: Given binary tree, [1, 2, 3, -1, 4, 5, -1, 6, -1, -1, 7, -1, -1, -1, -1] 
        1
      /   \
     2     3
     \     /
      4   5
     /     \
    6       7
Output: 0
Explanation: The difference between the height of left and right subtree is more than 1.