617. 合并二叉树
class Solution {
public:
TreeNode* mergeTrees(TreeNode* t1, TreeNode* t2) {
if(t1==NULL)return t2;
if(t2==NULL) return t1;
t1->val+=t2->val;
t1->left=mergeTrees(t1->left,t2->left);
t1->right=mergeTrees(t1->right,t2->right);
return t1;
}
};
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