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All Problems

# Status Problem video Level Completes Likes
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
60

Determine if Two BSTs are Identical

Beginner % 0
58

Generate All String Permutations

Hard % 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
52

Find Common Numbers in Three Sorted Arrays

Beginner % 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
47

Find the Size of the Binary Tree

Beginner % 0
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
40

In a Binary Tree, Create Linked Lists of all the nodes at each depth

Hard % 0
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
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
33

Reverse the binary representation of a number.

Medium % 1
32

Binary Search Tree (BST) Complete Implementation.

Beginner % 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

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

Determine If Two Nodes are Cousins

Determine if Two BSTs are Identical

Generate All String Permutations

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 Common Numbers in Three Sorted Arrays

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)

Find the Size of the Binary Tree

Check if One Binary Tree is a Subtree of Another

Inorder Successor in Binary Tree

Sorted Array to Binary Search Tree of Minimal Height

In a Binary Tree, Create Linked Lists of all the nodes at each depth

Level Order Traversal, Print each level in separate line

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 the binary representation of a number.

Binary Search Tree (BST) Complete Implementation.

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