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BASIC (33)
EASY (94)
MEDIUM (108)
HARD (12)
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Insert in Sorted Circular Linked List
- Check for BST
- Merge Sort
- Quick Sort
- Bottom View of Binary Tree
- Delete without head pointer
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Heap Sort
- Merge two sorted linked lists
- Sum Tree
- Connect Nodes of Levels
- Flattening a Linked List
- Stack using Queue
- Tree Boundary Traversal
- Delete a node from BST
- Directed Graph Cycle
- LCA in Binary Tree
- Maximum difference between node and its ancestor
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Binary Heap Operations
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological Sort
- Vertical Tree Traversal
- Find the number of islands
- Find kth element of spiral matrix
- Get Min from Stack
- Gas Station
- Linked List to Binary Tree
- Check if subtree
- Is Binary Tree Heap
- Clone a Binary Tree
- Validate an IP Address
- Remove loop in Linked List
- Dijkstra Algorithm
- Largest BST
- Multiply two strings
- Minimum Swaps to Sort
- Implement Atoi
- Palindrome Linked List
- Rat in a Maze
- Delete keys in a Linked list
- Count distinct elements in every window
- Find triplets with zero sum
- Sort a stack
- Top View of Binary Tree
- k-th Smallest in BST
- Level order traversal
- Peak element
- Union of Two Linked Lists
- Ancestors in Binary Tree
- Binary Tree to CDLL
- Root to Leaf Paths
- Occurences of 2 as a digit
- Vertical sum
- Predecessor and Successor
- Leaves to DLL
- Children Sum in a Binary Tree
- Diagonal sum in binary tree
- Normal BST to Balanced BST
- Construct Tree from Preorder Traversal
- C++ Friend function
- Min Heap implementation
- Reverse array in groups
- Wave Array
- Rearrange an array with O(1) extra space
- Rotate Array
- Kadane's Algorithm
- Smallest Positive missing number
- Union of 2 Sorted Arrays
- Indexes of Subarray Sum
- Merge Without Extra Space
- Spirally traversing a matrix
- Search in a sorted Matrix
- Rotate by 90 degree
- Determinant of a Matrix
- Strings Rotations of Each Other
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- M-Coloring Problem
- Optimal Strategy For A Game
- Longest Increasing Subsequence
- Longest Common Subsequence
- Lucky Numbers
- Longest Substring Without Repeating Characters
- Longest Palindrome Substring
- Container With Most Water
- Overlapping Intervals
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Valid Pair Sum
- Search in Rotated Sorted Array
- Maximum Product Subarray
- k largest elements
- Smallest distinct window
- K-th element of two Arrays
- Rod Cutting
- Valid Substring
- Maximum path sum in matrix
- Partition Equal Subset Sum
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Pairwise swap elements of a linked list
- Remove duplicates from an unsorted linked list
- Delete in a Doubly Linked List
- Inorder Traversal
- Reverse a Doubly Linked List
- Bubble Sort
- Insertion Sort
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Maximum Width of Tree
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Postorder Traversal
- Level Order in spiral form
- Reverse Level Order Traversal
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Root to leaf path sum
- Square Root
- Nodes without a Sibling
- Binary Search
- Run Length Encoding
- Largest subarray of 0's and 1's
- Remove Duplicates Sorted Array
- Level Order Line by Line
- BST Keys in a Range
- Minimum Depth of a Binary Tree
- Convert to Roman No
- Search a node in BST
- Expression Tree
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Max Level Sum in Binary Tree
- Special Stack
- Inorder Successor in BST
- Intersection of Two Linked Lists
- Minimum element in BST
- Sum of leaf nodes in BST
- Counting Sort
- Full Binary Tree
- Symmetric Tree
- Delete Alternate Nodes
- Huffman Decoding-1
- Count Pairs whose sum is equal to X
- Maximum Node Level
- Maximum Pairwise Computed Value
- Remove Half Nodes
- C++ Template
- Swap the objects
- Learning Structs
- Delete Array
- Rightmost different bit
- Digits In Factorial
- GP Term
- Primality Test
- Exactly 3 Divisors
- Modular Inverse
- Equilibrium Point
- Array Leaders
- Intersection of two sorted arrays
- Transpose of Matrix
- Anagram
- Isomorphic Strings
- Most Frequent Character
- Reverse Words
- Generate Binary Numbers
- Power Set Using Recursion
- Count number of hops
- First Repeating Element
- Find Immediate Smaller Than X
- Missing in Array
- Search an element in sorted and rotated array
- First Come First Serve
- Min sum formed by digits
- Add two numbers represented by two arrays
- Longest Common Prefix of Strings
- Merge two binary Max heaps
- Game of Nim
- Find Length of Linked List
- Check for Binary String
- Count Leaves in Binary Tree
- Queue using Linked List
- Queue Using Array
- Replace all 0's with 5
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Smallest divisible number
- Linked List Insertion At End
- Circular Linked List Traversal
- Is Linked List Length Even?
- Identical Linked Lists
- Sort and Reverse Vector
- Who has the majority?
- Absolute Value
- Convert Celsius To Fahrenheit
- Quadratic Equation Roots
- Print 1 To N Without Loop
- Adding two matrices
- Multiply the matrices
- Binary String
- Sum of Digits of a Number
- Fibonacci Using Recursion
- Addition Under Modulo
- Missing Characters in Panagram
- Array Subset
- Check for Power
- House Robber
- Anshuman's Favourite Number
- Height of Heap
- Series X1