leetcode 判断两棵树是否一致Same Tree

bool isSameTree(struct TreeNode* p, struct TreeNode* q) {
if(p==NULL&&q==NULL)return 1;
if(p==NULL||q==NULL)return 0;
if(p->val!=q->val)return 0;
else {
return isSameTree(p->left,q->left)&&isSameTree(p->right,q->right);}

}