删除链表中重复的结点

Desicription

在一个排序的链表中,存在重复的结点,请删除该链表中重复的结点,重复的结点不保留,返回链表头指针。 例如,链表1->2->3->3->4->4->5 处理后为 1->2->5

Solution

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/*
struct ListNode {
int val;
struct ListNode *next;
ListNode(int x) :
val(x), next(NULL) {
}
};
*/
class Solution {
public:
ListNode* deleteDuplication(ListNode* pHead) {
auto newHead = new ListNode(0);
newHead->next = pHead;
pHead = newHead;
auto current = pHead;
while(current && current->next) {
auto nextNode = current->next;
bool reFlag = false;
while(nextNode->next && nextNode->val == nextNode->next->val) {
nextNode = nextNode->next;
reFlag = true;
}
if(reFlag) {
current->next = nextNode->next;
} else {
current = current->next;
}
}
return pHead->next;
}
};