ListNode* PatrionListnode(ListNode* head, int target)
{
ListNode* dummynode1 = new ListNode(1000);
ListNode* dummynode2 = new ListNode(1000);
ListNode* pre1 = dummynode1;
ListNode* pre2 = dummynode2;
ListNode* cur = head;
while (cur)
{
if (cur->val < target)
{
pre1->next = cur;
cur = cur->next;
pre1 = pre1->next;
pre1->next = nullptr;
}
else
{
pre2->next = cur;
cur = cur->next;
pre2 = pre2->next;
pre2->next = nullptr;
}

}
ListNode* res = dummynode1->next;
pre1->next = dummynode1->next;
return res;

}

请问老师：将您给的题解中，for(ListNode* cur=head;cur!=nullptr;)写成ListNode* cur = head; while (cur)为什么会导致一直循环，出现错误呢？明明下面cur指针是一直在向后移动的呀