1. 题目

2. 方法一
2.1. 代码
class Solution {
public:
TreeNode* mergeTrees(TreeNode* t1, TreeNode* t2) {
if(t1==NULL) return t2;
if(t2==NULL) return t1;
t1->val=t1->val+t2->val;
t1->left=mergeTrees(t1->left,t2->left);
t1->right=mergeTrees(t1->right,t2->right);
return t1;
}
};
2.2. 结果
