package com.code.leet.contest.contest3; import com.code.leet.entiy.TreeNode; public class Solution1 { public static void main(String[] args) { Solution1 solution = new Solution1(); } public int countNodes(TreeNode root, int val) { int count = 0; if (root != null) { if (root.val == val) { count++; } count += countNodes(root.left, val); count += countNodes(root.right, val); } return count; } }