Add Palindrome Linked List (Fixes TheAlgorithms#2360) (TheAlgorithms#2746)

Author: aitorfi

Misc/PalindromeSinglyLinkedList.java

@@ -0,0 +1,47 @@
+package Misc;
+
+import java.util.Stack;
+import DataStructures.Lists.SinglyLinkedList;
+
+/**
+ * A simple way of knowing if a singly linked list is palindrome is to
+ * push all the values into a Stack and then compare the list to popped
+ * vales from the Stack.
+ * 
+ * See more: https://www.geeksforgeeks.org/function-to-check-if-a-singly-linked-list-is-palindrome/
+ */
+public class PalindromeSinglyLinkedList {
+    public static void main(String[] args) {
+        SinglyLinkedList linkedList = new SinglyLinkedList();
+
+        linkedList.insertHead(3);
+        linkedList.insertNth(2, 1);
+        linkedList.insertNth(1, 2);
+        linkedList.insertNth(2, 3);
+        linkedList.insertNth(3, 4);
+
+        if (isPalindrome(linkedList)) {
+            System.out.println("It's a palindrome list");
+        } else {
+            System.out.println("It's NOT a palindrome list");
+        }
+    }
+
+    public static boolean isPalindrome(SinglyLinkedList linkedList) {
+        boolean ret = true;
+        Stack<Integer> linkedListValues = new Stack<>();
+
+        for (int i = 0; i < linkedList.size(); i++) {
+            linkedListValues.push(linkedList.getNth(i));
+        }
+
+        for (int i = 0; i < linkedList.size(); i++) {
+            if (linkedList.getNth(i) != linkedListValues.pop()) {
+                ret = false;
+                break;
+            }
+        }
+
+        return ret;
+    }
+}