leetcode-82-删除排序链表中的重复元素 II
//不加伪头结点可能可以更快,注意new了就要删,指针不指了就要删
class Solution {
public:
ListNode* deleteDuplicates(ListNode* head) {
ListNode* temp = new ListNode(0);
temp->next = head;
ListNode* curNode = temp;
while (curNode->next != NULL) {
ListNode* next = curNode->next;
if (next->next != NULL && next->val == next->next->val) {
while (next->next != NULL && next->val == next->next->val) {
ListNode* del = next;
next = next->next;
delete del;
}
curNode->next = next->next;
delete next;
}
else curNode = next;
}
ListNode* newhead = temp->next;
delete temp;
return newhead;
}
};