Clone Binary Tree

ID: 375; medium; 克隆二叉树

LintCode 炼码

Solution 1 (Java)

/**
 * Definition of TreeNode:
 * public class TreeNode {
 *     public int val;
 *     public TreeNode left, right;
 *     public TreeNode(int val) {
 *         this.val = val;
 *         this.left = this.right = null;
 *     }
 * }
 */

public class Solution {
    /**
     * @param root: The root of binary tree
     * @return: root of new tree
     */
    public TreeNode cloneTree(TreeNode root) {
        if (root == null) return null;
        TreeNode newNode = new TreeNode(root.val);
        newNode.left = cloneTree(root.left);
        newNode.right = cloneTree(root.right);
        return newNode;
    }
}