Count Occurrences of a Value in a Binary Tree

Given a binary tree and a target value, count the occurrences of the target value in the tree. Input An integer representing the root of the binary tree. An integer representing the target value. Output An integer representing the number of times the target value appears in the binary tree. Example Input: Binary tree = [5,4,8,11,null,13,4,7,2,null,null,5,1], target value = 4 Output: 3 Constraints Number of nodes in the tree is [1, 1000]. Node values are within the range [-1000, 1000]. Example Input [5,4,8,11,null,13,4,7,2,null,null,5,1] 4