# Status Problem video Level Completes Likes 51 Print Binary Tree Nodes in Zigzag Order: Spiral Traversal Pattern Hard % 0 49 Find the Unreachable Minimum in Array Subsets Medium % 0 48 Determining Whether a Given Binary Tree is a Binary Search Tree (BST) Medium % 1 44 Inorder Successor in Binary Tree Medium % 0 43 Inorder Successor in Binary Search Tree without Using Parent link Hard % 0 42 Inorder Successor in Binary Search Tree Using Parent link Hard % 0 41 Sorted Array to Binary Search Tree of Minimal Height Medium % 1 40 In a Binary Tree, Create Linked Lists of all the nodes at each depth Hard % 0 38 Determining Binary Tree Balance Medium % 0 37 Get the Height of a Node in a Binary Tree Medium % 0 36 Find the Maximum Depth OR Height of a Binary Tree Beginner % 1 35 Adding Two Numbers with Linked Lists Medium % 0 34 Add two numbers represented by a linked list, Numbers are Stored in REVERSE order Medium % 0 31 Reverse a Linked List Using Recursion Medium % 0 30 Swap Every Kth Node in a LinkedList Medium % 0 29 Delete a Node in the Middle of a Linked List Without Access to Head Node Beginner % 0 28 Determine the Nth Node from the Tail in a Linked List Beginner % 0 26 Check if one string is Rotation of another string Beginner % 1 24 Replace Spaces with '%20' Without Using Default Functions Medium % 0 23 Find Whether Two Strings are Permutation of each other Beginner % 1 Print Binary Tree Nodes in Zigzag Order: Spiral Traversal Pattern Find the Unreachable Minimum in Array Subsets Determining Whether a Given Binary Tree is a Binary Search Tree (BST) Inorder Successor in Binary Tree Inorder Successor in Binary Search Tree without Using Parent link Inorder Successor in Binary Search Tree Using Parent link Sorted Array to Binary Search Tree of Minimal Height In a Binary Tree, Create Linked Lists of all the nodes at each depth Determining Binary Tree Balance Get the Height of a Node in a Binary Tree Find the Maximum Depth OR Height of a Binary Tree Adding Two Numbers with Linked Lists Add two numbers represented by a linked list, Numbers are Stored in REVERSE order Reverse a Linked List Using Recursion Swap Every Kth Node in a LinkedList Delete a Node in the Middle of a Linked List Without Access to Head Node Determine the Nth Node from the Tail in a Linked List Check if one string is Rotation of another string Replace Spaces with '%20' Without Using Default Functions Find Whether Two Strings are Permutation of each other 1 2 3 4 5 6 7 8 9 10 11 12
