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import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.regex.*;
public class Solution {
static class SinglyLinkedListNode { public int data; public SinglyLinkedListNode next; public SinglyLinkedListNode(int nodeData) { this.data = nodeData; this.next = null; } } static class SinglyLinkedList { public SinglyLinkedListNode head; public SinglyLinkedListNode tail; public SinglyLinkedList() { this.head = null; this.tail = null; } } public static void printSinglyLinkedList(SinglyLinkedListNode node, String sep, BufferedWriter bufferedWriter) throws IOException { while (node != null) { bufferedWriter.write(String.valueOf(node.data)); node = node.next; if (node != null) { bufferedWriter.write(sep); } } } // Complete the insertNodeAtHead function below. /* * For your reference: * * SinglyLinkedListNode { * int data; * SinglyLinkedListNode next; * } * */ static SinglyLinkedListNode insertNodeAtHead(SinglyLinkedListNode llist, int data) { SinglyLinkedListNode newNode = new SinglyLinkedListNode(data) ; if(llist == null) { llist = newNode; return llist; }else{ newNode.next = llist; return newNode; } } private static final Scanner scanner = new Scanner(System.in);
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Insert a node at the head of a linked list
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import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.regex.*;
public class Solution {