Fixing Errors after moving

Author: omprashantjain

17 DFS and BFS/InvertBinaryTree.java

@@ -1,5 +1,3 @@
-
-
 /**
  * Given the root of a binary tree, invert the
  * tree, and return its root.

22 Sliding Window/ContainsDuplicate2.java

@@ -1,4 +1,3 @@
-
 import java.util.HashSet;
 import java.util.Set;
 

8 Linked List/PalindromeLinkedList.java

@@ -1,6 +1,3 @@
-
-import in.knowledgegate.dsa.ListNode;
-
 /**
  * Given the head of a singly linked list,
  * return true if it is a palindrome.

ListNode.java

@@ -1,4 +1,3 @@
-
 class ListNode {
 
   public int val;

TreeNode.java

@@ -0,0 +1,13 @@
+public class TreeNode {
+
+  public int val;
+  public TreeNode left;
+  public TreeNode right;
+
+  public TreeNode() {
+  }
+
+  public TreeNode(int val) {
+    this.val = val;
+  }
+}