[剑指Offer] 56.删除链表中重复的结点
题目描述
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
【思路】递归
1 /* 2 struct ListNode { 3 int val; 4 struct ListNode *next; 5 ListNode(int x) : 6 val(x), next(NULL) { 7 } 8 }; 9 */ 10 class Solution { 11 public: 12 ListNode* deleteDuplication(ListNode* pHead) 13 { 14 if((pHead == NULL)||(pHead != NULL && pHead->next == NULL)) 15 return pHead; 16 ListNode* current; 17 if(pHead->val == pHead->next->val){ 18 current = pHead->next->next; 19 while(current != NULL && current->val == pHead->val) 20 current = current->next; 21 return deleteDuplication(current); 22 }else{ 23 current = pHead->next; 24 pHead->next = deleteDuplication(current); 25 return pHead; 26 } 27 } 28 };