# Status Problem video Level Completes Likes
81

Find Nodes X Levels Up from Leaf Nodes in a Tree

Medium % 0
80

Find Nodes at Distance X from Root in a Tree

Medium % 0
78

Root-to-Node Distance in Binary Tree: How to Find

Medium % 0
76

Calculate Vertical Sum in Binary Tree

Medium % 0
73

Lowest Common Ancestor in a Binary Search Tree.

Medium % 0
71

Given a binary tree, find out the maximum sum of value from root to each leaf

Medium % 0
70

Reversing Alternate Levels in a Binary Tree

Medium % 0
69

Convert Sorted Singly Linked List to Balanced Binary Search Tree

Medium % 1
66

Convert a Sorted Doubly Linked List to Balanced BST

Medium % 1
65

Given a binary tree, Find the Maximum Path Sum between Any Two Leaves

Medium % 0
62

In a Binary Tree, Check if Two nodes has the same parent or are siblings

Medium % 0
61

Determine If Two Nodes are Cousins

Medium % 0
57

Sort an Array According to the Order Defined by Another Array

Medium % 0
56

Sort an Array - odd numbers appear first in ascending order followed by the even numbers in descending order.

Medium % 0
54

Maximum Width of a Binary Tree

Medium % 0
53

Count occurrences of a number in a sorted array

Medium % 0
50

Find the first repeated element in an array by its index

Medium % 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
46

Check if One Binary Tree is a Subtree of Another

Medium % 0
44

Inorder Successor in Binary Tree

Medium % 0
41

Sorted Array to Binary Search Tree of Minimal Height

Medium % 1
39

Level Order Traversal, Print each level in separate line

Medium % 0
38

Determining Binary Tree Balance

Medium % 0
37

Get the Height of a Node in a Binary Tree

Medium % 0
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
33

Reverse the binary representation of a number.

Medium % 1
31

Reverse a Linked List Using Recursion

Medium % 0

Find Nodes X Levels Up from Leaf Nodes in a Tree

Find Nodes at Distance X from Root in a Tree

Root-to-Node Distance in Binary Tree: How to Find

Calculate Vertical Sum in Binary Tree

Lowest Common Ancestor in a Binary Search Tree.

Given a binary tree, find out the maximum sum of value from root to each leaf

Reversing Alternate Levels in a Binary Tree

Convert Sorted Singly Linked List to Balanced Binary Search Tree

Convert a Sorted Doubly Linked List to Balanced BST

Given a binary tree, Find the Maximum Path Sum between Any Two Leaves

In a Binary Tree, Check if Two nodes has the same parent or are siblings

Determine If Two Nodes are Cousins

Sort an Array According to the Order Defined by Another Array

Sort an Array - odd numbers appear first in ascending order followed by the even numbers in descending order.

Maximum Width of a Binary Tree

Count occurrences of a number in a sorted array

Find the first repeated element in an array by its index

Find the Unreachable Minimum in Array Subsets

Determining Whether a Given Binary Tree is a Binary Search Tree (BST)

Check if One Binary Tree is a Subtree of Another

Inorder Successor in Binary Tree

Sorted Array to Binary Search Tree of Minimal Height

Level Order Traversal, Print each level in separate line

Determining Binary Tree Balance

Get the Height of a Node in a Binary Tree

Adding Two Numbers with Linked Lists

Add two numbers represented by a linked list, Numbers are Stored in REVERSE order

Reverse the binary representation of a number.

Reverse a Linked List Using Recursion