94. Binary Tree Inorder TraversalEasyGiven the root of a binary tree, return the inorder traversal of its nodes' values. Example 1:Input: root = [1,null,2,3]Output: [1,3,2]Example 2:Input: root = []Output: []Example 3:Input: root = [1]Output: [1] Constraints:The number of nodes in the tree is in the range [0, 100].-100 Follow up: Recursive solution is trivial, could you do it iteratively? : 35..