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BASIC (3)
EASY (144)
MEDIUM (222)
HARD (47)
Pairwise swap elements of a linked list
Delete nodes having greater value on right
Remove duplicates from an unsorted linked list
Reverse a Doubly Linked List
Right View of Binary Tree
K distance from root
Mirror Tree
Height of Binary Tree
Balanced Tree Check
Kth from End of Linked List
Middle of a Linked List
Delete Middle of Linked List
Decimal Equivalent of Binary Linked List
Find Transition Point
Remove Duplicates from a Sorted Linked List
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
Nodes without a Sibling
Lowest Common Ancestor in a BST
Binary Tree to BST
Unique rows in boolean matrix
Remove every k'th node
Leaves at Same Level or Not
Delete in a Singly Linked List
Kth largest element in BST
Array Duplicates
Three way partitioning
Inorder Successor in BST
Index of an Extra Element
Insert in a Sorted List
Sum of leaf nodes in BST
More than n/k Occurrences
Symmetric Tree
Count Pairs whose sum is equal to X
Median of BST
Leaf under budget
Queue Reversal
Reverse first K of a Queue
Closest Neighbour in BST
Brothers From Different Roots
Delete Mid of a Stack
Swap the array elements
Predict the Column
Xoring and Clearing
Frequency in Queue
Frequency Game
First Set Bit
Rightmost different bit
Check K-th Bit
Power of 2
Frequencies in a Limited Array
Equilibrium Point
Array Leaders
Roof Top
Print adjacency list
Print Matrix in snake Pattern
Transpose of Matrix
Winner of an election
String Rotated by 2 Places
Isomorphic Strings
Reverse Words
Panagram Checking
Non Repeating Character
Parenthesis Checker
Minimum Cost of ropes
Reach a given score
Count ways to N'th Stair
Count number of hops
Missing in Array
Roman Number to Integer
Missing And Repeating
Count the elements
Find the closest number
Adding Ones
Move All Zeroes to End
String Duplicates Removal
Find Pair Given Difference
Alternate Positive Negative
Remaining String
Facing the sun
Convert array into Zig-Zag fashion
Rotate Bits
Number of occurrence
Reversing the equation
Does array represent Heap
Find missing in second array
String's Count
Play With OR
At Least K Occurrences
Find the closest pair from two arrays
Palindrome String
Odd Even Problem
Is Binary Number Multiple of 3
Minimum Operations
Divisibility by 8
Number of 1 Bits
Find the Highest number
Armstrong Numbers
Reverse Bits
Max Sum Subarray of size K
Nth Fibonacci Number
Swap two nibbles in a byte
Copy Set Bits in Range
Maximum Sum Problem
Party of Couples
Shortest path from 1 to n
Sum 1 to n Divisors
Count numbers containing 4
Reach the Nth point
Perfect Numbers
Largest number possible
Recamans sequence
Form a number divisible by 3 using array digits
Least Prime Factor
Sum of First N Natural Numbers
Recursive sequence
Juggler Sequence
Maximum Diamonds
Row with Minimum 1s
Surround the 1's
Trace Path
Inorder Traversal and BST
Letters Collection
Print Pattern
Sum of dependencies in a graph
Smallest window containing 0, 1 and 2
Insert an Element at the Bottom of a Stack
Fibonacci series up to Nth term
Maximum Depth Of Binary Tree
Divisor Game
Maximum Identical Bowls
Bus Conductor
Binary Modulo
Total Cuts
Bit Magic
Array Operations
Ticket Counter
Unique Number of Occurrences
Two Swaps
Reverse alternate nodes in Link List
Sort a linked list of 0s, 1s and 2s
Merge 2 sorted linked list in reverse order
Insert in Sorted Circular Linked List
Quick Sort
Binary Tree from Inorder and Postorder
Delete without head pointer
Heap Sort
Two Stacks in an Array
Topological sort
Find kth element of spiral matrix
Max sum in the configuration
Serialize and deserialize a binary tree
Additive sequence
Multiply two strings
Implement Atoi
Palindrome Linked List
Print matrix in diagonal pattern
Closest in BST
BST with Dead End
Find triplets with zero sum
Duplicate Subtree
Find Common Nodes in two BSTs
Level order traversal
Peak element
Union of Two Linked Lists
Euler Circuit in an Undirected Graph
Euler circuit and Path
Binary Tree to CDLL
Root to Leaf Paths
Linked List that is Sorted Alternatingly
K Sum Paths
Leftmost and rightmost nodes of binary tree
Arrange Consonants and Vowels
Count the nodes at distance K from leaf
Vertical sum
Isomorphic Trees
Predecessor and Successor
Children Sum in a Binary Tree
Diagonal sum in binary tree
Deletion and Reverse in Circular Linked List
Normal BST to Balanced BST
Sum of nodes on the longest path
Kth Ancestor in a Tree
ZigZag Tree Traversal
Mother Vertex
Gray to Binary Conversion
Smallest Positive Missing
Power Of Numbers
Maximum occured integer
Rearrange an array with O(1) extra space
Maximum Index
Two Repeated Elements
Union of 2 Sorted Arrays
Indexes of Subarray Sum
Merge Without Extra Space
Level of Nodes
Make Matrix Beautiful
Boolean Matrix
Determinant of a Matrix
Subarray with 0 sum
Strings Rotations of Each Other
K Sized Subarray Maximum
Fractional Knapsack
Minimum Jumps
Detect Cycle using DSU
Stickler Thief
Optimal Strategy For A Game
Sum of all substrings of a number
Longest Increasing Subsequence
Longest Common Subsequence
Lucky Numbers
Implement Trie
Shortest Common Supersequence
Nth Catalan Number
Top K Frequent in Array
Word Break
Stock Buy and Sell – Multiple Transaction Allowed
Word Search
4 Sum - All Quadruples
Paths to reach origin
Pascal Triangle
Maximum Index
Number of subarrays with maximum values in given range
Flip Bits
Top k numbers in a stream
Consecutive 1's not allowed
Pythagorean Triplet
Painting the Fence
Count pairs Sum in matrices
Sum of bit differences
Form the Largest Number
Longest subarray with sum divisible by K
Check if a string is repetition of its substring of k-length
Swapping pairs make sum equal
Check if frequencies can be equal
Substrings with K Distinct
Nuts and Bolts Problem
Cutting Binary String
Shuffle integers
Find the N-th character
k largest elements
Sum of XOR of all pairs
Longest Substring with K Uniques
Longest Palindrome in a String
Arranging the array
Rod Cutting
K closest elements
LCS of three strings
Longest Palindromic Subsequence
Largest Sum Subarray of Size at least K
Minimize the Heights II
Transform to prime
First and Last Occurrences
Minimum Deletions
Print N-bit binary numbers having more 1s than 0s
Permutations of a String
Number following a pattern
CamelCase Pattern Matching
Sum of Products
Subarrays Product Less than K
Unique Number II
Bleak Numbers
Modular Exponentiation
Game of XOR
Largest prime factor
Maximum Tip Calculator
Modified Game of Nim
Maximize dot product
Max Sum Increasing Subsequence
Minimum cost to fill given weight in a bag
Coin Change (Count Ways)
Sequence of Sequence
Santa Banta
String Subsequence
Gold Mine Problem
Perfect Sum Problem
Trail of ones
K-Palindrome
Longest subsequence-1
Power Set
Minimum Cost To Make Two Strings Identical
Knapsack with Duplicate Items
nCr
Geek and its Game of Coins
Minimum steps to destination
Partition Equal Subset Sum
Count possible ways to construct buildings
Count digit groupings of a number
Array Pair Sum Divisibility Problem
Matchsticks game
Number of paths
Nth Natural Number
Number of paths in a matrix with k coins
Game with String
Smith Number
Maximum sum of hour glass
How Many X's?
Exit Point in a Matrix
Longest Repeating Subsequence
Stream First Non-repeating
Check If two Line segments Intersect
Transitive closure of a Graph
Replace O's with X's
Rohan's Love for Matrix
Express as sum of power of natural numbers
Traverse All Edges And Vertices
Find the string in grid
Techfest and the Queue
Largest subsquare surrounded by X
Shortest Source to Destination Path
Divisibility tree
Remove K Digits
Construct list using given q XOR queries
Prefix match with other strings
Find duplicate rows in a binary matrix
Paths from root with a specified sum
Shortest Prime Path
Sort for Singly Linked List
Anti Diagonal Traversal of Matrix
Unique Number III
All Unique Permutations of an array
Course Schedule
Clone an Undirected Graph
Find k-th smallest element in given n ranges
Reverse a Stack
Maximum Meetings in One Room
Max Equal sum of 3 Stacks
Buy Maximum Stocks
Find shortest safe route in a matrix
Graph is Tree or Not
Minimum Multiplications to reach End
Number Of Enclaves
Eventual Safe States
City With the Smallest Number of Neighbors at a Threshold Distance
Path With Minimum Effort
Shortest path in Directed Acyclic Graph
Minimal Cost
Combination Sum II
Task Scheduler
Hands of Straights
Minimum Absolute Difference In BST
Lemonade Change
Maximum Sum Combination
Partitions with Given Difference
Floor in BST
Water the plants
Number of Good Components
Maximum subset sum
Palindrome with minimum sum
Count Total Setbits
Tree Transformation
Construct a Full Binary Tree
Modify Linked List-1
Find Kth permutation
Fraction pairs with sum 1
New Year Resolution
Grinding Geek
Flatten BST to sorted list
Minimize the Difference
Pairs violating the BST property
Kth common ancestor in BST
Linked List Group Reverse
Binary Tree to DLL
Clone List with Next and Random
Min distance between two given nodes of a Binary Tree
Subtraction in Linked List
Distinct occurrences
AVL Tree Insertion
AVL Tree Deletion
Merge Sort on Doubly Linked List
Nodes at given distance in binary tree
Smallest window containing all characters
Solve the Sudoku
Next Smallest Palindrome
Count Pairs in an Array
Search Pattern
Longest Prefix Suffix
Wildcard string matching
Longest repeating and non-overlapping substring
Sum-string
Minimum Points To Reach Destination
Palindromic Partitioning
Next Happy Number
Strictly Increasing Array
Generalised Fibonacci numbers
Boolean Parenthesization
Longest valid Parentheses
Possible Paths in a Tree
N-Queen Problem
Brackets in Matrix Chain Multiplication
Search Pattern (Rabin-Karp Algorithm)
Find all Critical Connections in the Graph
Distribute candies in a binary tree
Split Array Largest Sum
Find number of closed islands
Find the String
Stock Buy and Sell – Max 2 Transactions Allowed
Largest rectangular sub-matrix whose sum is 0
Vertex Cover
Expression Add Operators
Minimize Max Distance to Gas Station
Candy
Account Merge
Better String
Count Binary Strings With No Consecutive 1s
Min Time
Geekina Hate 1s
Making A Large Island
Minimum element in BST
Reverse a String
First n Fibonacci
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