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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
代码1:
import java.util.*; public class Solution { public ListNode deleteDuplication(ListNode pHead) { if(pHead == null) return null; //定义一个链表,存放所有节点的值 ArrayList<Integer> list = new ArrayList<Integer>(); //定义一个头指针 ListNode p = pHead; list.add(p.val); while(p.next != null) { //滑动指针 p = p.next; list.add(p.val); } //取出存在不重复的值 ArrayList<Integer> list2 = new ArrayList<Integer>(); for(int i : list) { int count = 0; for(int j : list) { if(i == j) count ++; } if(count == 1) list2.add(i); } //重建链表 if(list2.size() == 0) return null; ListNode pHead2,p2; pHead2 = new ListNode(list2.get(0)); p2 = pHead2; for(int i = 1;i < list2.size();i ++) { p2.next = new ListNode(list2.get(i)); p2 = p2.next; } return pHead2; } }代码2:
public class Solution { public ListNode deleteDuplication(ListNode pHead) { if (pHead == null) { return null; } ListNode headNode = new ListNode(0); headNode.next = pHead; ListNode pre = headNode; ListNode p = pHead; while(p != null && p.next != null){ if(p.val == p.next.val){ int temp = p.next.val; while(p != null && p.val == temp){ p = p.next; } pre.next = p; }else{ pre = p; p = p.next; } } return headNode.next; } }
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原文地址:http://blog.csdn.net/baidu_21578557/article/details/51611570