题解 | #反转链表#
反转链表
https://www.nowcoder.com/practice/75e878df47f24fdc9dc3e400ec6058ca
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}*/
public class Solution {
public ListNode ReverseList(ListNode head) {
//特殊情况判断
if(head == null){
return null;
}
//依次反转当前节点,直到当前节点为空时,返回前一个节点。
ListNode pre = null, cur = head;
while(cur != null){
ListNode tmp = cur.next;
cur.next = pre;
pre = cur;
cur = tmp;
}
return pre;
}
}
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