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RemoveNNodeFromLast.java
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RemoveNNodeFromLast.java
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import java.util.ArrayList;
import java.util.List;
public class RemoveNNodeFromLast {
public static void main(String[] args) {
// TODO Auto-generated method stub
new RemoveNNodeFromLast();
}
public RemoveNNodeFromLast() {
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;
ListNode removeNthFromEnd = removeNthFromEnd(node1, 2);
while(removeNthFromEnd.next != null){
System.out.print(removeNthFromEnd.val+"->");
removeNthFromEnd = removeNthFromEnd.next;
}
System.out.print(removeNthFromEnd.val);
}
public ListNode removeNthFromEnd(ListNode head, int n) {
ListNode main = head;
ListNode ref = head;
int i =0;
while(i < n){
System.out.println("kya "+ref.val);
ref = ref.next;
i++;
}
if(ref == null)
return main.next;
while(ref.next != null){
main = main.next;
ref = ref.next;
}
main.next = main.next.next;
return head;
}
/**
* Definition for singly-linked list.*/
public class ListNode {
int val;
ListNode next;
ListNode(int x) { val = x; }
}
}