JAVA Easy to understand


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    public class Solution {
        public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
            if (t1 == null && t2 == null) return null;
            if (t1 == null) return t2;
            if (t2 == null) return t1;
            TreeNode res = new TreeNode(t1.val + t2.val);
            res.left = mergeTrees(t1.left, t2.left);
            res.right = mergeTrees(t1.right, t2.right);
            return res;
        }
    }
    

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