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Problem

Submissions

Check If Linked List Is Palindrome

Contributed by

Vishal Modani

Last Updated: 23 Feb, 2023

Easy

0/40

Avg time to solve 15 mins

Success Rate 85 %

6 upvotes

Problem Statement

You are given a Singly Linked List of integers. You have to find if the given linked list is palindrome or not.

A List is a palindrome if it reads the same from the left to the right and from the right to the left.

For example, the lists (1 -> 2 -> 1), (3 -> 4 -> 4-> 3), and (1) are palindromes, while the lists (1 -> 2 -> 3) and (3 -> 4) are not.

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line of input contains a single integer T, representing the number of test cases or queries to be run. 

Then the T test cases follow.

The first and only line of each test case contains the elements of the linked list separated by a single space and terminated by -1. Hence, -1 would never be a list element.

Output Format :

For each test case, print “True” if the given linked list is a palindrome, else print “False”.

Note:

You do not need to print anything, it has already been taken care of. Just implement the given function.

Constraints :

1 <= T <= 10
1 <= N <= 5 * 10^4
-10^9 <= data <= 10^9 and data != -1

Where N is the number of nodes in the linked list and ‘data’ represents the value of the nodes of the list.

Time Limit: 1sec

Sample Input 1:

Sample Output 1:

True
False
True

Explanation for Sample Input 1:

In the 1st test case, the given list is a palindrome.
In the 2nd test case, the given list is not a palindrome.
In the 3rd test case,  the given list is a palindrome.

Sample Input 2:

2
3 2 1 -1
1 1 1 -1

Sample Output 2:

False
True

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