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  • 203. Remove Linked List Elements【Easy】【未排序链表删除其中的给定值】

    Remove all elements from a linked list of integers that have value val.

    Example:

    Input:  1->2->6->3->4->5->6, val = 6
    Output: 1->2->3->4->5

    /**
     * Definition for singly-linked list.
     * public class ListNode {
     *     int val;
     *     ListNode next;
     *     ListNode(int x) { val = x; }
     * }
     */
    class Solution {
        public ListNode removeElements(ListNode head, int val) {
            if (head == null) return null;
            ListNode cur = head;
            while (cur.next != null) {
                if (cur.next.val == val) cur.next = cur.next.next;
                else cur = cur.next;
            }
            return head.val == val ? head.next : head;
        }
    
    }

    【递归】

    /**
     * Definition for singly-linked list.
     * public class ListNode {
     *     int val;
     *     ListNode next;
     *     ListNode(int x) { val = x; }
     * }
     */
    class Solution {
        public ListNode removeElements(ListNode head, int val) {
            if (head == null) return null;
            head.next = removeElements(head.next, val);
            return head.val == val ? head.next : head;
        }
    
    }

     

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  • 原文地址:https://www.cnblogs.com/Roni-i/p/10443056.html
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