Write the code in Java or C and provide time complexity analysis to show what time complexity the algorithm is in big O form (e.g. O(log n)).

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Trees 4. Given a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level), Write the description and code of the algorithm. Example: Definition of TreeNode: Input: {1,#,2,3} public class TreeNode { Output: [[1],[2],[3]] public int val; Explanation: public TreeNode left, right; public TreeNode(int val) { this.val = val; this.left = this.right = null; W-N-+