Niuke-top101-bm32

import java.util.*;

/* * public class TreeNode { * int val = 0; * TreeNode left = null; * TreeNode right = null; * } */

public class Solution {
    
    /** * * @param t1 TreeNode class  * @param t2 TreeNode class  * @return TreeNode class  */
    public TreeNode mergeTrees (TreeNode t1, TreeNode t2) {
    
        // write code here
        if(t1 == null){
    
            return t2;
        }
        if(t2 ==  null){
    
            return t1;
        }
        TreeNode head = new TreeNode(t1.val + t2.val);
        head.left = mergeTrees(t1.left, t2.left);
        head.right = mergeTrees(t1.right, t2.right);
        return head;
    }
}