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BASIC (81)
EASY (281)
MEDIUM (418)
HARD (64)
- Rearrange characters
- Nearly Sorted Algorithm
- The FIFA Fever
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Rearrange a linked list
- Add 1 to a Linked List Number
- Merge 2 sorted linked list in reverse order
- Linked List in Zig-Zag fashion
- Detect Loop in linked list
- Rearrange linked list in-place
- Insert in Sorted Circular Linked List
- QuickSort on Doubly Linked List
- Count BST nodes that lie in a given range
- Merge Sort
- Binary Tree from Inorder and Postorder
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Heap Sort
- Merge two sorted linked lists
- Add all greater values to every node in a BST
- Sum Tree
- Construct Binary Tree from Parent Array
- Connect Nodes of Levels
- Flattening a Linked List
- Diagonal Tree Traversal
- Tree Boundary Traversal
- Reverse alternate levels of a perfect binary tree
- Delete a node from BST
- Directed Graph Cycle
- LCA in Binary Tree
- Maximum difference between node and its ancestor
- Absolute List Sorting
- Two Stacks in an Array
- Binary Heap Operations
- Max sum path in two arrays
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological sort
- Vertical Tree Traversal
- Merge K sorted linked lists
- Find the number of islands
- Find kth element of spiral matrix
- Max sum in the configuration
- Get Min from Stack
- Serialize and deserialize a binary tree
- Gas Station
- Wildcard Pattern Matching
- Linked List to Binary Tree
- Generate IP Addresses
- Check if subtree
- Extreme nodes in alternate order
- Kth element in Matrix
- Is Binary Tree Heap
- Clone a Binary Tree
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Additive sequence
- Largest BST
- Interleaved Strings
- Sorted subsequence of size 3
- Count Palindromic Subsequences
- Multiply two strings
- Minimum Swaps to Sort
- Maximum Difference
- Count of distinct substrings
- Palindrome Linked List
- Strongly Connected
- Print matrix in diagonal pattern
- Rat in a Maze Problem - I
- Bipartite Graph
- Max sum subarray by removing at most one element
- Number of root to leaf paths
- Closest in BST
- BST with Dead End
- Pots of Gold Game
- Delete keys in a Linked list
- Merge two BST 's
- Minimum four sum subsequence
- k-Anagram
- Merge k Sorted Arrays
- Root to leaf paths sum
- Longest Palindrome in Linked List
- Print Nodes having K leaves
- Find triplets with zero sum
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Find Common Nodes in two BSTs
- Polynomial Addition
- Delete nodes greater than k
- Merge Sort for Linked List
- Maximum Bipartite Matching
- Union of Two Linked Lists
- Euler Circuit in an Undirected Graph
- Euler circuit and Path
- Ancestors in Binary Tree
- Binary Tree to CDLL
- Pair Sum in BST
- Root to Leaf Paths
- Populate Inorder Successor for all nodes
- XOR Linked List
- Counting elements in two arrays
- Construct expression tree
- Linked List that is Sorted Alternatingly
- K Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Modify Linked List-1
- Construct Tree from Inorder & Preorder
- Arrange Consonants and Vowels
- Count the nodes at distance K from leaf
- Vertical sum
- Mirror of a given node
- Insert in Sorted way in a Sorted DLL
- Isomorphic Trees
- Maximum path sum from any node
- pth common ancestor in BST
- Predecessor and Successor
- Leaves to DLL
- Largest Independent Set Problem
- Children Sum in a Binary Tree
- Diagonal sum in binary tree
- Deletion and Reverse in Circular Linked List
- Normal BST to Balanced BST
- Right Sibling in Binary Tree
- Duplicate Subtrees
- Construct Tree from Preorder Traversal
- Sum of nodes on the longest path
- Construct a Full Binary Tree
- Convert Level Order Traversal to BST
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Vertical Width of a Binary Tree
- Path Count in Directed Graph
- Swap Kth nodes from ends
- Add two numbers represented by Linked List
- Maximum sum of Non-adjacent nodes
- Mother Vertex
- Tower Of Hanoi
- Smallest Positive Missing
- Power Of Numbers
- Possible Words From Phone Digits
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Unique BST's
- Indexes of Subarray Sum
- Count the number of possible triangles
- Possible paths between 2 vertices
- Spirally traversing a matrix
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Subarray range with given sum
- Longest Consecutive Subsequence
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Minimum Platforms
- Largest number in K swaps
- Black and White
- Combination Sum
- Unique Subsets
- M-Coloring Problem
- Ways to write n as sum
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Optimal Strategy For A Game
- Minimum number of jumps
- Sum of all substrings of a number
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Number of Unique Paths
- Equal Sum Partition
- Sort according to an Array
- Preorder to BST
- X Total Shapes
- Find whether path exist
- Shortest Common Supersequence
- Nth Catalan Number
- Rotten Oranges
- Steps by Knight
- Count subsequences of type a^i, b^j, c^k
- Maximize The Cut Segments
- Print Anagrams Together
- Rotate by 90 degree
- Overlapping Intervals
- Word Break
- Word Boggle
- Excel Sheet | Part - 1
- Paths to reach origin
- How many pizzas ?
- Taking 1 out of 3 consecutives
- Maximum Index
- Flip Bits
- Top k numbers in a stream
- Count Increasing Subsequences
- Maximize Number of 1's
- Pair array product sum
- Equivalent Sub-Arrays
- Consecutive 1's not allowed
- Count Occurences of Anagrams
- Count of Subarrays
- Pythagorean Triplet
- Mr Modulo and Pairs
- Painting the Fence
- Pair Sum Closest to 0
- Search in Rotated Sorted Array
- Sum of bit differences
- Print Binary Tree levels in sorted order
- Count Full Binary Trees
- Max absolute difference
- Max Score from Subarray Mins
- Form the Largest Number
- Add Binary Strings
- Maximum Product Subarray
- Row with max 1s
- Substrings with K Distinct
- Count of Palindromic substrings in an Index range
- Palindrome SubStrings
- Form a palindrome
- Nuts and Bolts Problem
- Maximum distinct elements after removing K elements
- Count the Reversals
- Cutting Binary String
- Max Sum without Adjacents
- Equal 0, 1 and 2
- Find length of longest subsequence
- Shuffle integers
- Reverse each word in a given string
- Length of the longest substring
- k largest elements
- Sum of XOR of all pairs
- Longest Common Substring
- Smallest distinct window
- Look and Say Pattern
- Save Winterfell
- Pass the semester
- Cut rope to maximise product
- Tic Tac Toe
- Integer to Words
- String Conversion
- Arranging the array
- String formation from substring
- Possible groups
- Longest Arithmetic Subsequence
- Triplets with Smaller Sum
- Rod Cutting
- Greater tower sum
- Fill array with 1's
- Smallest Subarray GCD
- Pick Values
- LCS of three strings
- Longest Palindromic Subsequence
- Largest Sum Subarray of Size at least K
- Longest Common Increasing Subsequence
- First negative in every window of size k
- Maximum difference of zeros and ones in binary string
- Number of palindromic strings
- Check if any valid sequence is divisible by M
- Construct binary palindrome by repeated appending and trimming
- Minimum Deletions
- Print N-bit binary numbers having more 1s than 0s
- Valid Substring
- Minimum number of deletions
- Permutations of a String
- Number following a pattern
- Substring - Subsequence problem
- Friends Pairing Problem
- Special Numbers
- CamelCase Pattern Matching
- Maximum Sum Subsequence of length k
- Combination Sum - Part 2
- Unique Number II
- Bleak Numbers
- Ways to sum to N
- Collecting Trees
- Skip the work
- Max possible amount
- Maximum calorie
- Game of XOR
- Maximum Tip Calculator
- Minimum number of deletions and insertions
- Maximize dot product
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Distinct Transformations
- Coin Change (Count Ways)
- Count numbers with given sum
- Minimum steps to delete a string
- String Subsequence
- Minimum Time
- Mobile numeric keypad
- Modify array to maximize sum of adjacent differences
- Gold Mine Problem
- Non-decreasing subsequence
- Coin Change (Minimum Coins)
- Number of permutation with K inversions
- Number of subsequences in a string divisible by n
- Palindromic Strings
- Perfect Sum Problem
- Smallest number
- Shreyansh and his bits
- Longest subsequence-1
- Power Set
- Minimum Cost To Make Two Strings Identical
- Subset with sum divisible by k
- Knapsack with Duplicate Items
- Number of substrings divisible by 8 but not by 3
- Printing Maximum Sum Increasing Subsequence
- Temple Offerings
- nCr
- Number of ways
- Subsets with XOR value
- Geek and its Game of Coins
- Maximum path sum in matrix
- Minimum steps to destination
- Special Keyboard
- Longest Bitonic subsequence
- Min Coin
- Get Minimum Squares
- Handshakes
- Count possible ways to construct buildings
- Count digit groupings of a number
- Jumbled Strings
- Probability of Knight
- Array Pair Sum Divisibility Problem
- Count the number of ways to tile the floor of size n x m using 1 x m size tiles
- Magic Triplets
- Subset Sums
- Unique partitions
- N Digit numbers with digits in increasing order
- Last non-zero digit in factorial
- Number of paths
- Sisters and coins
- Stepping Numbers
- Permutation with Spaces
- Path of greater than equal to k length
- Coins and Game
- Number of paths in a matrix with k coins
- Card Rotation
- Bell Numbers
- Fact Digit Sum
- Arrange Balls
- Jumping Numbers
- Count in array
- Game with String
- Two water Jug problem
- Count even length
- Find the Safe Position
- Count of AP Subsequences
- Count ways to increase LCS length of two strings by one
- Next Permutation
- Element left after performing alternate OR & XOR operation
- Smaller on Left
- Geek and knots
- Nitika and her queries
- Exit Point in a Matrix
- Longest Repeating Subsequence
- Longest alternating subsequence
- Composite and Prime
- Finding Profession
- Decode the string
- Preorder Traversal and BST
- Total Decoding Messages
- Distributing Balls
- Stream First Non-repeating
- Buying Vegetables
- Villain Con
- Possible paths
- Segregate even and odd nodes in a Linked List
- Print leaf nodes from preorder traversal of BST
- Largest square formed in a matrix
- Pizza Mania
- Pyramid form
- Water Overflow
- Rat Maze With Multiple Jumps
- Easy Query
- Snake and Ladder Problem
- Geek and Strings
- Eulerian Path in an Undirected Graph
- Transitive closure of a Graph
- Replace O's with X's
- Mail System Design
- Find all distinct subset (or subsequence) sums
- Check Mirror in N-ary tree
- Your Social Network
- Queries on Strings
- Special Matrix
- Queries on a Matrix
- Broken blocks
- Express as sum of power of natural numbers
- Traverse All Edges And Vertices
- Find the string in grid
- Shortest Uncommon Subsequence
- Nodes at even distance
- Biconnected Graph
- Reverse Delete Algorithm for Minimum Spanning Tree
- Floyd Warshall
- Negative weight cycle
- Flood fill Algorithm
- Shortest Source to Destination Path
- Divisibility tree
- Maximum sum Rectangle
- Image Multiplication
- Hamiltonian Path
- Recursively Remove Adjacent Duplicates
- BST to greater sum tree
- Graph is Tree or Not
- Replace by X
- String Ignorance
- Geeky Parity
- Reverse a linked list
- Frequency in a Linked List
- Delete N nodes after M nodes of a linked list
- Pairwise swap elements of a linked list
- Node at a given index in linked list
- Linked list of strings forms a palindrome
- Compare two linked lists
- Delete nodes having greater value on right
- Split a Linked List into two halves
- Inorder Traversal
- Reverse a Doubly Linked List
- Check for BST
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Two Mirror Trees
- Delete without head pointer
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Decimal Equivalent of Binary Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Stack using two queues
- Level Order in spiral form
- Reverse Level Order Traversal
- DFS of Graph
- Stack using Linked List
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Root to leaf path sum
- Nodes without a Sibling
- Postorder from Inorder and Preorder
- Lowest Common Ancestor in a BST
- Binary Search
- Largest subarray of 0's and 1's
- Level Order Line by Line
- BST Keys in a Range
- Print all possible strings
- Minimum Depth of a Binary Tree
- Odd even level difference
- Binary Tree to BST
- K-Palindrome
- Unique rows in boolean matrix
- Remove every k'th node
- Leaves at Same Level or Not
- Third largest element
- Convert to Roman No
- Match specific pattern
- Multiply two linked lists
- Josephus problem
- You and your books
- Expression Tree
- Max distance between same elements
- Repetition of k length substring
- Count Occurrence of digit k
- Generate Grey Code Sequences
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Max Level Sum in Binary Tree
- Special Stack
- String Modification
- Level order traversal
- Inorder Successor in BST
- Index of an Extra Element
- Operating an array
- Convert Ternary Expression to Binary Tree
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Level of a Node in Binary Tree
- Sum of leaf nodes in BST
- Max and min element in Binary Tree
- Perfect Binary Tree
- Reverse Using Stack
- XOR of a given range
- Full Binary Tree
- Triplet with 0 sum in BST
- Symmetric Tree
- Delete Alternate Nodes
- Construct BST from Postorder
- Merge Lists Alternatingly
- Huffman Decoding-1
- Next Right Node
- Count Pairs whose sum is equal to X
- Depth of node
- Maximum Node Level
- Find length of Loop
- Change of Key in BST
- Linked List Matrix
- Queue Reversal
- Reverse first K of a Queue
- Remove Half Nodes
- Height of Spiral Tree
- Sum of Leaf Nodes
- Sum of Right Leaf Nodes
- Sum of Left Leaf Nodes
- Closest Neighbour in BST
- Brothers From Different Roots
- Tilt of Binary Tree
- Move all zeros to the front of the linked list
- Delete Mid of a Stack
- Rotate doubly Linked List
- Product of an Array
- Swap the array elements
- Matrix Interchange
- Even Subsets
- Matrix Interchange - Java
- Stack Operations
- Frequency in Queue
- Operations on PriorityQueue
- Get min at pop
- Deque Implementations
- Min Heap implementation
- First Set Bit
- Wave Array
- Floor in a Sorted Array
- Minimum Number in a sorted rotated array
- Print adjacency list
- Print Matrix in snake Pattern
- Rotate by 90 degree
- Anagram
- The Modified String
- Reverse Words
- Panagram Checking
- Parenthesis Checker
- Minimum indexed character
- Generate Binary Numbers
- Minimum Cost of ropes
- N meetings in one room
- Count ways to N'th Stair
- Count number of hops
- Reach a given score
- Check Equal Arrays
- Nth number made of prime digits
- Missing in Array
- Product array puzzle
- Excel Sheet | Part - 2
- Longest Increasing subarray
- Maximum value
- Subarrays with given sum
- Buildings receiving sunlight
- Pairs of equals Sum
- Find Kth Rotation
- Find the closest number
- Finding-Pairs
- Adding Ones
- Pairs with certain difference
- Pairs with Difference less than K
- Sorted and Rotated Minimum
- Search in a Row-Column sorted matrix
- String Duplicates Removal
- Min sum formed by digits
- String Manipulation
- Maximum Sum Bitonic Subsequence
- Permutations in array
- Swap and Maximize
- Sum of length
- Minimize Difference in Task Priorities
- Bitonic Point
- Find Duplicate Element
- Partition Point in the Array
- Single Number
- Alternate Positive Negative
- Closing bracket index
- Remove b and ac from a given string
- Addition of submatrix
- Stuffs Division
- Sort in specific order
- Form largest number from digits
- Ordering of strings
- Rearrange string as alternate x and y occurences
- Sherlock a Detective
- Arya's Long String
- Sorting Employees
- Greater on right side
- Distinct Substrings
- Convert array into Zig-Zag fashion
- Rearrange to Make arr[i] = i
- Equal point in a string of brackets
- Maximum repeating number
- Does array represent Heap
- Rope Cutting
- Find minimum adjustment cost of an array
- String's Count
- Largest Fibonacci Subsequence
- Min Number of Flips
- Maximum number of characters between any two same character
- Sum of distinct elements for a limited range
- Counts Zeros Xor Pairs
- Two sum -Pairs with 0 Sum
- Sum of f(a[i], a[j]) over all pairs in an array of n integers
- Large number division
- Print an array in Pendulum Arrangement
- Inverse Permutation
- Play With OR
- At Least K Occurrences
- Element with left side smaller and right side greater
- Total distance travelled in an array
- Merge two binary Max heaps
- Sum of Lengths of Non-Overlapping SubArrays
- Charul and vessels
- Total count
- Left out candies
- Delete Array Elements
- Chocolate Station
- Pattern Searching
- Equalization of an array
- Print Bracket Number
- Easy string
- Does robot moves circular
- Minimal moves to form a string
- Mr. Binary
- Lucas Number
- Colorful Strings
- Is Binary Number Multiple of 3
- Maximum prefix sum for a given range
- Padovan Sequence
- Karatsuba Algorithm
- Minimum Operations
- Check if divisible by 10
- Check if a Integer is power of 8 or not
- Compute sum of digits in all numbers from 1 to n
- Set Bits
- Reverse Bits
- Rearrange the array
- Powers game
- Maximum Number of 1s
- Maximum Sum Problem
- Maximum Product Cutting
- High Effort vs Low Effort
- Minimum insertions to sort an array
- Minimum number of deletions to make a sorted sequence
- Shortest path from 1 to n
- Count binary strings
- Minimum steps to minimize n as per given condition
- Sieve of Eratosthenes
- Count numbers containing 4
- Faithful Numbers
- Reach the Nth point
- Minimum number of Coins
- Number of Groups
- Numbers with same first and last digit
- Maximum weight transformation of a given string
- Optimal walk
- Adjacents are not allowed
- Letter Writer
- Recamans sequence
- Count ways to express N as the sum of 1,3 and 4
- Recursive sequence
- Increasing Sub Sequence
- Sum of average of all subsets
- Summed Matrix
- Maximum Diamonds
- LCS of '0' K Repeated String
- Maximum Collatz sequence length
- Primitive Typing
- Geeky Year
- Next sparse binary number
- Trace Path
- Inorder Traversal and BST
- Largest zigzag sequence
- Help the Old Man!!!
- Print Pattern
- Chicks in a Zoo
- Count the paths
- Array to BST
- Sum of dependencies in a graph
- Shortest distance in infinite tree
- Sum of k smallest elements in BST
- Riddle the Middle
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Max rectangle
- Subtraction in Linked List
- Distinct occurrences
- Box Stacking
- AVL Tree Insertion
- Partition array to k subsets
- Maximum subset XOR
- Alien Dictionary
- Smallest range in K lists
- AVL Tree Deletion
- Merge Sort on Doubly Linked List
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Max Path Sum 2 Special Nodes
- Huffman Decoding
- Number of Turns in Binary Tree
- Trapping Rain Water
- Smallest window containing all characters of another string
- Histogram Max Rectangular Area
- Max of min for every window size
- Find median in a stream
- Solve the Sudoku
- Minimum Cost Path
- The Painter's Partition Problem-II
- Distinct palindromic substrings
- Count Smaller elements
- Number of distinct subsequences
- Circle of strings
- Longest repeating and non-overlapping substring
- Sum-string
- Maximum XOR subset
- Edit Distance
- Min cut Square
- Minimum number of elements
- Minimum Points To Reach Destination
- Doctor Strange
- Minimum sum partition
- Number Formation
- Palindromic Partitioning
- Next Happy Number
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Strictly Increasing Array
- Bit Difference
- Boolean Parenthesization
- Longest valid Parentheses
- Longest Zig-Zag Sub Sequence
- Word Break - 2
- N-Queen Problem
- Brackets in Matrix Chain Multiplication
- Phone directory
- Adventure in a Maze
- Optimal binary search tree
- Longest Path in a matrix
- Let's Play!!!
- Huffman Encoding
- Find the Maximum Flow
- Find minimum s-t cut in a flow network
- Rotate Array
- Count Linked List Nodes
- Size of Binary Tree
- Count Leaves in Binary Tree
- Postorder Traversal
- Queue Using Array
- Count zeros in a sorted matrix
- Largest product
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Equal Sum and XOR
- Peak element
- Play with an array
- Minimum element in BST
- Is Linked List Length Even?
- Identical Linked Lists
- Triplet Family
- Sum of Binary Tree
- Pairwise Consecutive Elements
- Stack designer
- Queue Push & Pop
- Sum Array Puzzle
- Reverse array in groups
- Binary Array Sorting
- Binary String
- Keypad typing
- Merge and Sort
- Rearranging array
- Count number of elements between two given elements in array
- Minimum move to front operations
- Count pair sum
- Elements before which no element is bigger
- Friendly Array
- Balanced Array
- Farthest Index
- Check Arithmetic Progression
- Type of array
- Anagram Palindrome
- Fibonacci in the array
- Make Co-prime Array
- Segregate Even and Odd numbers
- Count Pairs Odd Xor
- The problem of identical arrays
- Sum of alternate product
- Immediate Smaller Element
- Quick Left Rotation
- Stable Sort and Position
- A guy with a mental problem
- First 1 in a Sorted Binary Array
- Elements in the Range
- Last index of One
- Distinct Adjacent Element
- String with numbers at its end
- Sum Triangle for given array
- Exceptionally odd
- Ishaan Loves Chocolates
- Rotating an Array
- First and Second Smallests
- Multiply left and right array sum
- Maximum Perimeter of Triangle from array
- Average Count Array
- Positive and negative elements
- Smallest number repeating K times
- Factor OR Multiple
- Smallest power of 2 greater than or equal to n
- Check if a number can be expressed as x^y
- Longest Increasing Subarray
- Shortest un-ordered subarray
- Sort first half in ascending and second half in descending
- Tough Competitors
- Absolute Difference of 1
- Angle between hour and minute hand
- G.F Series
- Anshuman's Favourite Number
- Height of Heap
- Number of Integer solutions
- Largest subarray with GCD one
- Finding Position
- Sorted matrix
- Starting Point
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