114 lines
3.0 KiB
Java
114 lines
3.0 KiB
Java
import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.text.*;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.*;
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public class Solution {
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static class DoublyLinkedListNode {
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public int data;
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public DoublyLinkedListNode next;
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public DoublyLinkedListNode prev;
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public DoublyLinkedListNode(int nodeData) {
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this.data = nodeData;
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this.next = null;
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this.prev = null;
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}
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}
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static class DoublyLinkedList {
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public DoublyLinkedListNode head;
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public DoublyLinkedListNode tail;
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public DoublyLinkedList() {
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this.head = null;
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this.tail = null;
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}
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public void insertNode(int nodeData) {
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DoublyLinkedListNode node = new DoublyLinkedListNode(nodeData);
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if (this.head == null) {
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this.head = node;
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} else {
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this.tail.next = node;
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node.prev = this.tail;
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}
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this.tail = node;
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}
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}
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public static void printDoublyLinkedList(DoublyLinkedListNode node, String sep, BufferedWriter bufferedWriter)
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throws IOException {
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while (node != null) {
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bufferedWriter.write(String.valueOf(node.data));
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node = node.next;
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if (node != null) {
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bufferedWriter.write(sep);
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}
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}
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}
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// Complete the reverse function below.
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/*
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* For your reference:
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*
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* DoublyLinkedListNode { int data; DoublyLinkedListNode next;
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* DoublyLinkedListNode prev; }
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*
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*/
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static DoublyLinkedListNode reverse(DoublyLinkedListNode head) {
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while (head != null) {
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DoublyLinkedListNode temp = head.prev;
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head.prev = head.next;
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head.next = temp;
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head = head.prev;
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}
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if(temp != null){
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head = temp.prev;
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}
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return head;
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}
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) throws IOException {
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BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
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int t = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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for (int tItr = 0; tItr < t; tItr++) {
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DoublyLinkedList llist = new DoublyLinkedList();
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int llistCount = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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for (int i = 0; i < llistCount; i++) {
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int llistItem = scanner.nextInt();
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scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
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llist.insertNode(llistItem);
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}
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DoublyLinkedListNode llist1 = reverse(llist.head);
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printDoublyLinkedList(llist1, " ", bufferedWriter);
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bufferedWriter.newLine();
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}
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bufferedWriter.close();
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scanner.close();
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}
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}
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