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RemoveDuplicatesFromSortedList.java
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RemoveDuplicatesFromSortedList.java
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package com.leetcode;
public class RemoveDuplicatesFromSortedList {
//https://leetcode.com/problems/remove-duplicates-from-sorted-list/
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode deleteDuplicates(ListNode head) {
ListNode start = new ListNode(-999);
start.next = head;
ListNode prev = start;
while(head != null){
if(prev.val == head.val){
prev.next = head.next;
}else{//important
prev = head;
}
head = head.next;
}
return start.next;
}
}
// * Definition for singly-linked list.
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
}