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BASIC (72)
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HARD (46)
- Sahil love good scorer
- Geek-onacci Number
- Good Numbers
- Ticket Counter
- Frequency in a Linked List
- Node at a given index in linked list
- Linked list of strings forms a palindrome
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Delete in a Doubly Linked List
- K distance from root
- Mirror Tree
- Maximum Width of Tree
- Delete without head pointer
- Height of Binary Tree
- Balanced Tree Check
- Middle of a Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Find Transition Point
- Queue using two Stacks
- Stack using two queues
- Level Order in spiral form
- Reverse Level Order Traversal
- Square Root
- Nodes without a Sibling
- Lowest Common Ancestor in a BST
- Remove Duplicates Sorted Array
- Level Order Line by Line
- Almost Prime Numbers
- Josephus problem
- Delete in a Singly Linked List
- Three way partitioning
- Level order traversal
- Insert in a Sorted List
- Max and min element in Binary Tree
- Reverse Using Stack
- Delete Alternate Nodes
- Next Right Node
- Count Pairs whose sum is equal to X
- Find length of Loop
- Find n/k th node in Linked list
- Linked List Matrix
- Queue Reversal
- Reverse first K of a Queue
- Magical Number
- Closest Neighbour in BST
- Move all zeros to the front of the linked list
- Delete Mid of a Stack
- Xoring and Clearing
- Stack Operations
- Frequency in Queue
- Get min at pop
- Rightmost different bit
- Digits In Factorial
- GP Term
- Primality Test
- Longest Consecutive 1's
- Exactly 3 Divisors
- Modular Inverse
- Power of 2
- Swap odd and even bits
- Wave Array
- Equilibrium Point
- Array Leaders
- Minimum Number in a sorted rotated array
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Anagram
- Reverse Words
- Parenthesis Checker
- Minimum indexed character
- Generate Binary Numbers
- K largest elements
- Minimum Cost of ropes
- Largest number with given sum
- Union-Find
- Count ways to N'th Stair
- First Repeating Element
- Positive Negative Pair
- Find Immediate Smaller Than X
- Excel Sheet | Part - 2
- Max Value Permutation
- Missing And Repeating
- Count the elements
- Sort by Set Bit Count
- Maximize sum after K negations
- Pairs with certain difference
- Number and the Digit Sum
- Sum of elements between k1'th and k2'th smallest elements
- Move All Zeroes to End
- Min sum formed by digits
- Count the triplets
- Find Pair Given Difference
- Swap and Maximize
- Alternate Positive Negative
- Kth distance
- Palindrome Sentence
- Rearrange a string
- Second Largest
- Longest common prefix
- Count even substrings
- Find missing in second array
- Longest Common Prefix of Strings
- Special array reversal
- Counts Zeros Xor Pairs
- Play With OR
- Hungry Pizza Lovers
- Maximum sum of increasing order elements from n arrays
- The Counting Game !!
- Merge two binary Max heaps
- Four Elements
- Maximum average subarray
- Smallest greater elements in whole array
- Shop in Candy Store
- Minimum changes to make all substrings distinct
- Partition a number into two divisible parts
- Encrypt the string - 2
- Minimum Operations
- Adding Array Elements
- Empty The Tank
- Number of 1 Bits
- Find the Highest number
- Midori and chocolates
- Reverse Bits
- Max Sum Subarray of size K
- Change Bits
- Swap two nibbles in a byte
- Toggle bits in the given range
- Party of Couples
- Twisted Prime Number
- Swap bits
- Nth item through sum
- Smallest number with sum of digits as N and divisible by 10^N
- Find nth root of m
- Circular Prime Number
- Collection of pens
- Find the highest occurring digit in prime numbers in a range
- Rearrange Geek and his Classmates
- Help the Old Man!!!
- K-Ary Tree
- Minimum Exchange
- Array to BST
- Ball coloring
- Rearrange Geek and his Classmates
- Fraction Trouble
- Sum of k smallest elements in BST
- Gadgets of Doraland
- Sum of two numbers without using arithmetic operators
- Even and Odd
- Search insert position of K in a sorted array
- Largest value in each level
- Construction of a string
- Count the Subarrays
- Find all possible paths from top to bottom
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Smallest window containing 0, 1 and 2
- Can Make Triangle
- Matrix Operations
- Find pairs with given sum in doubly linked list
- Triangle and Square
- Seating Arrangement
- Divisor Game
- Max Level Sum in Binary Tree
- Powerfull Integer
- Nearly Sorted Algorithm
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Quick Sort on Linked List
- 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
- Merge two sorted linked lists
- Add all greater values to every node in a BST
- Connect Nodes of Levels
- Diagonal Tree Traversal
- Delete a node from BST
- Maximum difference between node and its ancestor
- Binary Heap Operations
- The Celebrity Problem
- Vertical Tree Traversal
- Merge K sorted linked lists
- Find the number of islands
- Serialize and deserialize a binary tree
- Gas Station
- Generate IP Addresses
- Check if subtree
- Kth element in Matrix
- Dijkstra Algorithm
- Largest BST
- Interleaved Strings
- Count Palindromic Subsequences
- Multiply two strings
- Palindrome Linked List
- Rat in a Maze Problem - I
- Bipartite Graph
- Pots of Gold Game
- Count distinct elements in every window
- Merge k Sorted Arrays
- Longest Palindrome in Linked List
- Find triplets with zero sum
- Sort a stack
- Top View of Binary Tree
- Polynomial Addition
- Delete nodes greater than k
- Euler Circuit in an Undirected Graph
- Root to Leaf Paths
- Complete Binary Tree
- Counting elements in two arrays
- Construct expression tree
- Foldable Binary Tree
- Arrange Consonants and Vowels
- Vertical sum
- Insert in Sorted way in a Sorted DLL
- Leaves to DLL
- Deletion and Reverse in Circular Linked List
- Count Number of SubTrees having given Sum
- Swap Kth nodes from ends
- Maximum sum of Non-adjacent nodes
- Ceil in BST
- Gray to Binary Conversion
- Tower Of Hanoi
- Possible Words From Phone Digits
- Rearrange an array with O(1) extra space
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Two Repeated Elements
- Smallest Positive missing number
- Union of 2 Sorted Arrays
- Indexes of Subarray Sum
- Triplet Sum in Array
- Possible paths between 2 vertices
- Make Matrix Beautiful
- Spirally traversing a matrix
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Subarrays with equal 1s and 0s
- Case-specific Sorting of Strings
- Postfix Evaluation
- Stock span problem
- K Sized Subarray Maximum
- Nearly sorted
- Activity Selection
- Minimum Platforms
- Unique Subsets
- M-Coloring Problem
- Minimum Jumps
- Egg Dropping Puzzle
- Sum of all substrings of a number
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Number of Unique Paths
- Preorder to BST
- X Total Shapes
- Find whether path exist
- Implement Trie
- Shortest Common Supersequence
- Nth Catalan Number
- Rotten Oranges
- Count subsequences of type a^i, b^j, c^k
- Rotate by 90 degree
- Generate Parentheses
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Paths to reach origin
- Equivalent Sub-Arrays
- Count Occurences of Anagrams
- Pair Sum Closest to 0
- Smallest factorial number
- Maximize The Array
- Form the Largest Number
- Super Primes
- Maximum Product Subarray
- Longest subarray with sum divisible by K
- Row with max 1s
- Form a palindrome
- Longest Subarray with Sum K
- Count the Reversals
- Number of positive integral solutions
- Sum of two large numbers
- Reverse each word in a given string
- Remove leading zeros from an IP address
- Magnet Array Problem
- Longest Common Substring
- Smallest distinct window
- Longest Substring with K Uniques
- Integer to Words
- K-th element of two Arrays
- String formation from substring
- Triplets with Smaller Sum
- Minimum swaps and K together
- Smallest Absolute Difference
- LCS of three strings
- Longest Palindromic Subsequence
- First negative in every window of size k
- Minimum sum
- First and Last Occurrences
- Reaching the heights
- Smaller on Left
- Maximum Product of Increasing Subsequence of Size 3
- Print N-bit binary numbers having more 1s than 0s
- Nine Divisors
- Valid Substring
- Minimum number of deletions
- Previous number in one swap
- Friends Pairing Problem
- Sum of Products
- Unique Number II
- Largest prime factor
- Minimum number of deletions and insertions
- Maximize dot product
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Coin Change (Minimum Coins)
- Power Of 2 and Subsequences
- Kth Smallest Factor
- Firing employees
- Knapsack with Duplicate Items
- nCr
- Number of ways
- Subsets with XOR value
- Partition Equal Subset Sum
- XOR Game
- Longest Bitonic subsequence
- Min Coin
- Handshakes
- Count possible ways to construct buildings
- Count digit groupings of a number
- Probability of Knight
- Brain Game
- Money Distributions
- Find Last Digit Of a^b for Large Numbers
- Killing Spree
- Subset Sums
- N Digit numbers with digits in increasing order
- Nth Natural Number
- Knight Walk
- Permutation with Spaces
- Choose and Swap
- Return two prime numbers
- Find Prime numbers in a range
- Party in Town
- Next Permutation
- Geek and knots
- Longest Repeating Subsequence
- Villain Con
- Possible paths
- Tricky Subset Problem
- Rat Maze With Multiple Jumps
- Pairs of Non Coinciding Points
- 7 Segment Display
- Product of Primes
- Eulerian Path in an Undirected Graph
- nCr mod M | Part 2
- Rohan's Love for Matrix
- Check Mirror in N-ary tree
- Queries on Strings
- Special Matrix
- Broken blocks
- Shortest Uncommon Subsequence
- Nodes at even distance
- Biconnected Graph
- Help a Thief!!!
- Count the paths
- Negative weight cycle
- Form coils in a matrix
- Maximum sum Rectangle
- Shortest Path between Cities
- Moving on grid
- Height Using Parent Array
- Recursively Remove Adjacent Duplicates
- Theft at World Bank
- Number of minimum picks to get 'k' pairs of socks from a drawer
- Coins of Geekland
- Transfiguration
- Ruling Pair
- Triplets in Sorted Linked List
- Help Classmates
- Lucy's Neighbours
- Spidey Sense
- Escape the Forbidden Forest
- Jump Game
- Triplets with sum with given range
- Iterative Postorder
- Subset Sum Problem
- Form a palindrome
- Search Pattern (Z-algorithm)
- Bellman-Ford
- Partition a Linked List around a given value
- Capacity To Ship Packages Within D Days
- Coin Piles
- Substrings of length k with k-1 distinct elements
- Clone a stack without using extra space
- Count pairs in array divisible by K
- Number of Provinces
- Binary Matrix with at most K 1s
- Maximum sum leaf to root path
- Find duplicate rows in a binary matrix
- Maximum GCD of siblings of a binary tree
- BST to max heap
- BST to greater sum tree
- Find rectangle with corners as 1
- Cousins of a given node
- Division without using multiplication, division and mod operator
- Insertion Sort for Singly Linked List
- Subsets
- Rank The Permutations
- Course Schedule
- Find and Replace in String
- Minimum times A has to be repeated such that B is a substring of it
- Bitwise AND of the Array
- Distinct Elements
- Maximum number of events that can be attended
- Longest Possible Route in a Matrix with Hurdles
- Farthest number
- Robots
- Hit most Balloons
- Concatenate Equal to Target
- Exactly one swap
- Maximum Winning score
- Compute Before Matrix
- Levels Of Game
- Smallest sum contiguous subarray
- Minimum Cost to cut a board into squares
- Special Keyboard 2
- Maximum selections
- LCP
- Next element with greater frequency
- Sum of nodes within k distance from target
- Minimum increment/decrement to make array non-Increasing
- Maximum Profit By Choosing A Subset Of Intervals
- Merging Details
- Combination Sum II
- Minimum Absolute Difference In BST
- Connect Nodes at Same Level
- Fill the Matrix
- Geek hates too many 1s
- Pairs violating the BST property
- Kth common ancestor in BST
- Rotate Array
- Print Linked List
- Count Linked List Nodes
- Size of Binary Tree
- Implement stack using array
- Queue using Linked List
- Queue Using Array
- Count zeros in a sorted matrix
- Sum Except First and Last
- C++ STL | Set 5 (queue)
- Equal Sum and XOR
- Smallest divisible number
- Peak element
- Linked List Insertion At End
- Minimum element in BST
- Anagram of String
- Circular Linked List Traversal
- Is Linked List Length Even?
- Identical Linked Lists
- Modular Node
- Insert in Middle of Linked List
- Stack designer
- Queue Push & Pop
- Who has the majority?
- Absolute Value
- Convert Celsius To Fahrenheit
- Quadratic Equation Roots
- Bit Difference
- Print 1 To N Without Loop
- Reverse array in groups
- Sorted Array Search
- Binary Array Sorting
- Check if a string is Isogram or not
- Addition Under Modulo
- Doubling the value
- Balanced Array
- Sort the Half Sorted
- Sort a String
- Anagram Palindrome
- Immediate Smaller Element
- Lower case to upper case
- A guy with a mental problem
- Repeated Character
- Find the Number which contain the digit d
- Elements in the Range
- Rotate Array by One
- Game with nos
- Exceptionally odd
- Ishaan Loves Chocolates
- Array Subset
- Product is even or odd?
- Multiply left and right array sum
- Print first letter of every word in the string
- Red OR Green
- 1s Complement
- Find position of set bit
- Set kth bit
- Change all even bits in a number to 0
- Strong Numbers
- Binary Shift to Divide
- Binary number to decimal number
- Sum of elements in a matrix
- The dice problem
- Ways To Tile A Floor
- Ladoo problem
- Remainder Evaluation
- Print 1 to n without using loops
- Anshuman's Favourite Number
- Unique Numbers
- Sum of product of x and y with floor(n/x) = y
- Sorted matrix
- Starting Point
- Binary Tree to DLL
- Box Stacking
- Partition array to k subsets
- Max Path Sum 2 Special Nodes
- Number of Turns in Binary Tree
- Trapping Rain Water
- Max of min for every window size
- Count Smaller elements
- Largest rectangle of 1s with swapping of columns allowed
- Maximum XOR subset
- Minimum Points To Reach Destination
- Minimum sum partition
- Palindromic Partitioning
- Matrix Chain Multiplication
- Strictly Increasing Array
- Median in a row-wise sorted Matrix
- Kill Captain America
- Boolean Parenthesization
- Bike Racing
- Word Break - 2
- Brackets in Matrix Chain Multiplication
- nCr mod M | Part 1
- Adventure in a Maze
- Closest Palindrome
- Optimal binary search tree
- Assignment Problem
- Longest Path in a matrix
- Word Wrap
- Huffman Encoding
- Find the Maximum Flow
- Smallest Positive Integer that can not be represented as Sum
- Corona Vaccine
- Shortest Range In BST
- Longest substring to form a Palindrome
- Minimum X (xor) A
- Sorted Linked List to BST
- Palindrome Pairs
- Array Partition
- Count occurrences of a given word in a 2-d array
- Number of distinct words with K maximum contiguous vowels
- Reverse a sublist of a linked list
- Shortest Unique prefix for every word
- Count the number of subarrays
- Kth Smallest Number in Multiplication Table
- Minimum time to fulfil all orders
- Geek in a Maze
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