ReverseLinkedList
ReverseLinkedList.java 源码
package datastructure.linkedlist.leetcode;
/**
* @author roseduan[roseduan520@gmail.com]
* @time 2019/12/6 0:16
* @description 单链表反转
*/
public class ReverseLinkedList {
/**
* 迭代
*/
public ListNode reverseList1(ListNode head) {
ListNode prev = null, cur = head;
while(cur != null) {
ListNode next = cur.next;
cur.next = prev;
prev = cur;
cur = next;
}
return prev;
}
/**
* 递归
*/
public ListNode reverseList2(ListNode head) {
return helper(null, head);
}
private ListNode helper(ListNode prev, ListNode cur) {
if (cur == null) {
return prev;
}
ListNode next = cur.next;
cur.next = prev;
return helper(cur, next);
}
private static class ListNode{
int val;
ListNode next;
ListNode(int val) {
this.val = val;
this.next = null;
}
}
}
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