Given two binary trees, write a program to check if they are identical or not.

Problem Note

• Two binary trees are considered the same if they are structurally identical and the nodes have the same value.
• If the binary trees are same, the output is 1, else 0.

Example 1

Input:     3         3
          / \       / \
         4   5     4   5

        [3,4,5]   [3,4,5]

Output: 1
Explanation: The above binary trees are structurally identical and have the same values.

Example 2

Input:     2         2
          /           \
         4             4

        [2,4]     [2,null,4]
Output: 0
Explanation: The above binary trees have the same values but are not structurally identical.