-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathLastKNodes.java
More file actions
44 lines (39 loc) · 1.09 KB
/
Copy pathLastKNodes.java
File metadata and controls
44 lines (39 loc) · 1.09 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
package nowcoder;
import java.util.List;
class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}
public class LastKNodes {
public static ListNode FindKthToTail(ListNode head, int k) {
if (head == null) return null;
if (k <= 0) return null;
ListNode leader = head;
for (int i = 0; i < k - 1; i++) {
leader = leader.next;
}
if (leader == null) return null;
while (leader.next != null) {
head = head.next;
leader = leader.next;
}
return head;
}
public static void main(String[] args) {
ListNode node1 = new ListNode(1);
ListNode node2 = new ListNode(2);
ListNode node3 = new ListNode(3);
ListNode node4 = new ListNode(4);
ListNode node5 = new ListNode(5);
node1.next = node2;
node2.next = node3;
node3.next = node4;
node4.next = node5;
node5.next = null;
ListNode listNode = FindKthToTail(node1, 1);
System.out.println(listNode.val);
}
}