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/** * Definition for a binary tree node. * public class TreeNode { *     int val; *     TreeNode left; *     TreeNode right; *     TreeNode(int x) { val = x; } * } */class Solution {
       public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
       //合并的老套路了        if(t1 == null) {
               return t2;        }        if(t2 == null) {
               return t1;        }        TreeNode temp = new TreeNode(t1.val + t2.val);        temp.left = mergeTrees(t1.left, t2.left);        temp.right = mergeTrees(t1.right, t2.right);        return temp;    }}

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