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SCHOOL (3)
BASIC (110)
EASY (277)
MEDIUM (224)
HARD (17)
- Longest Even Length Substring
- Sorting Elements of an Array by Frequency
- Rearrange characters
- Nearly Sorted Algorithm
- Find the Maximum sum
- Reverse alternate nodes in Link List
- Sort a linked list of 0s, 1s and 2s
- Rearrange a linked list
- Merge 2 sorted linked list in reverse order
- Linked List in Zig-Zag fashion
- Detect Loop in linked list
- Count BST nodes that lie in a given range
- Merge Sort
- Quick Sort
- 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
- Connect Nodes of Levels
- Flattening a Linked List
- Delete a node from BST
- Absolute List Sorting
- The Celebrity Problem
- Largest subarray with 0 sum
- Max sum in the configuration
- Gas Station
- Linked List to Binary Tree
- Extreme nodes in alternate order
- Is Binary Tree Heap
- Clone a Binary Tree
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Sorted subsequence of size 3
- Minimum Swaps to Sort
- Implement Atoi
- Maximum Difference
- Palindrome Linked List
- Closest in BST
- Delete keys in a Linked list
- Merge two BST 's
- Count distinct elements in every window
- Merge k Sorted Arrays
- Root to leaf paths sum
- Longest Palindrome in Linked List
- Find triplets with zero sum
- Sort a stack
- Top View of Binary Tree
- k-th Smallest in BST
- Find Common Nodes in two BSTs
- Polynomial Addition
- Union of Two Linked Lists
- Pair Sum in BST
- Occurences of 2 as a digit
- Counting elements in two arrays
- Linked List that is Sorted Alternatingly
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Arrange Consonants and Vowels
- Vertical sum
- Pairs violating BST property
- 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
- Convert Level Order Traversal to BST
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Maximum sum of Non-adjacent nodes
- Smallest Positive Missing
- Rotate and delete
- Rearrange Array Alternately
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Unique BST's
- Indexes of Subarray Sum
- Triplet Sum in Array
- Possible paths between 2 vertices
- Spirally traversing a matrix
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Case-specific Sorting of Strings
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Kth smallest element
- Activity Selection
- Minimum Platforms
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Minimum number of jumps
- Longest Increasing Subsequence
- Longest Common Subsequence
- Lucky Numbers
- Number of Unique Paths
- Sort according to an Array
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Shortest Common Supersequence
- Rotten Oranges
- Most frequent word in an array of strings
- Count subsequences of type a^i, b^j, c^k
- Print Anagrams Together
- Overlapping Intervals
- 4 Sum - All Quadruples
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Pascal Triangle
- Top k numbers in a stream
- Maximize Number of 1's
- Sum of Middle elements of two sorted arrays
- Pair array product sum
- Mr. Modulo and Arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Single Among Doubles
- Pythagorean Triplet
- Pair Sum Closest to 0
- Search in Rotated Sorted Array
- Sum of bit differences
- Maximum Intervals Overlap
- Max absolute difference
- Max Score from Subarray Mins
- Form the Largest Number
- Efficiently sorting numbers in range from 0 to n^2 - 1
- Water Collection
- Add Binary Strings
- Subarray Sum Divisible By K
- Remove minimum elements
- Check if a string is repetition of its substring of k-length
- Row with max 1s
- Swapping pairs make sum equal
- Concatenation of Zig-Zag String in n Rows
- Design a tiny URL or URL shortener
- Palindrome SubStrings
- Form a palindrome
- Nuts and Bolts Problem
- Rotate a Matrix
- Longest Subarray with Sum K
- Transform String
- Count the Reversals
- Max Sum without Adjacents
- Factorials of large numbers
- Shuffle integers
- Reverse each word in a given string
- Length of the longest substring
- k largest elements
- Magnet Array Problem
- Longest Common Substring
- Smallest distinct window
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Look and Say Pattern
- Integer to Words
- K-th element of two Arrays
- Arranging the array
- String formation from substring
- Possible groups
- Triplets with Smaller Sum
- Longest Palindromic Subsequence
- First negative in every window of size k
- Smallest Non-Zero Number
- Find k-th character in string
- Roll the characters of a String
- Minimize the Heights II
- Surpasser Count
- First and Last Occurrences
- Palindrome in Alphanumeric String
- Valid Substring
- Permutations of a String
- Number following a pattern
- Subsequence matching
- Sum of Products
- Unique Number II
- Bleak Numbers
- Game of XOR
- Largest prime factor
- Max Sum Increasing Subsequence
- Sieve of Eratosthenes
- Smallest number
- Trail of ones
- Count ways to N'th Stair(Order does not matter)
- Number of ways
- Maximum path sum in matrix
- Minimum steps to destination
- Special Keyboard
- Maximum GCD Pair
- Handshakes
- Array Pair Sum Divisibility Problem
- Digit multiplier
- N Digit numbers with digits in increasing order
- Last non-zero digit in factorial
- Number of paths
- Stepping Numbers
- Return two prime numbers
- Sum of Query II
- Find Prime numbers in a range
- Prime Factors and their Powers
- Game with String
- Numbers with alternative 1's
- Smith Number
- Next Permutation
- Prime factorization and geek number
- Smaller on Left
- Finding Profession
- Rotate Each Row of Matrix K Times
- Preorder Traversal and BST
- Total Decoding Messages
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Print leaf nodes from preorder traversal of BST
- Largest square formed in a matrix
- Water Overflow
- Kth Largest in a Stream
- Snake and Ladder Problem
- String Ignorance
- SP - Beautiful Pairs
- Reverse a linked list
- Frequency in a Linked List
- Delete N nodes after M nodes of a linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Delete in a Doubly Linked List
- Inorder Traversal
- Reverse a Doubly Linked List
- Selection Sort
- Insertion Sort
- Check for BST
- Right View of Binary Tree
- K distance from root
- Mirror Tree
- Two Mirror Trees
- Maximum Width of Tree
- Delete without head pointer
- Height of Binary Tree
- 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
- 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
- Square Root
- Nodes without a Sibling
- Lowest Common Ancestor in a BST
- Binary Search
- Largest subarray of 0's and 1's
- Remove Duplicates Sorted Array
- Level Order Line by Line
- BST Keys in a Range
- Print all possible strings
- Remove duplicates in array
- Odd even level difference
- Equilibrium index of an array
- Remove every k'th node
- Third largest element
- Convert to Roman No
- Multiply two linked lists
- Josephus problem
- You and your books
- Max distance between same elements
- Longest Consecutive Subsequence
- Generate Grey Code Sequences
- 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
- Level order traversal
- Inorder Successor in BST
- Index of an Extra Element
- Convert Ternary Expression to Binary Tree
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Split Linked List Alternatingly
- Sum of leaf nodes in BST
- More than n/k Occurrences
- Delete Alternate Nodes
- Construct BST from Postorder
- Merge Lists Alternatingly
- Find the Sum of Last N nodes of the Linked List
- Count Pairs whose sum is equal to X
- Maximum Node Level
- Find length of Loop
- Median of BST
- Find n/k th node in Linked list
- Linked List Matrix
- Maximum Pairwise Computed Value
- Queue Reversal
- Reverse first K of a Queue
- Remove Half Nodes
- Height of Spiral Tree
- Sum of Leaf Nodes
- Closest Neighbour in BST
- Brothers From Different Roots
- Sum of Leaf Nodes at Min Level
- Delete Mid of a Stack
- Java Collections | Set 7 (LinkedList)
- BigInteger Multiply
- Pair Sum in Vector
- Frequency in Queue
- Operations on PriorityQueue
- Frequency Game
- First Set Bit
- Power of 2
- Wave Array
- Frequencies in a Limited Array
- Array Leaders
- Floor in a Sorted Array
- Print Matrix in snake Pattern
- Winner of an election
- String Rotated by 2 Places
- Strings Rotations of Each Other
- Reverse Words
- Minimum indexed character
- Non Repeating Character
- Parenthesis Checker
- Generate Binary Numbers
- K largest elements
- Minimum Cost of ropes
- Largest number with given sum
- Count ways to N'th Stair
- Count number of hops
- First Repeating Element
- Unique Substrings
- Common Elements
- Check Equal Arrays
- Numbers containing 1, 2 and 3
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Intersection of Arrays with Distinct
- Excel Sheet | Part - 2
- Max Value Permutation
- Missing And Repeating
- Buildings receiving sunlight
- Non-Repeating Element
- Pairs of equals Sum
- Max value
- Count the elements
- Maximum Gap
- Minimum Energy
- Pairs which are Divisible by 4
- Find Maximum Sum Strictly Increasing Subarray
- Greedy Fox
- Sorted and Rotated Minimum
- Maximum no of 1's row
- Sum of elements between k1'th and k2'th smallest elements
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- String Duplicates Removal
- Equal Sum and Product
- Min sum formed by digits
- Min Subsets with Consecutive Numbers
- Minimize the sum of product
- Move all negative elements to end
- String Manipulation
- Chocolate Distribution Problem
- Minimum Distinct Ids
- Count the triplets
- Punish the Students
- Find Pair Given Difference
- Pairs with difference k
- Pair with greatest product in array
- Drive the car
- Bitonic Point
- Bird and maximum fruit gathering
- Find Duplicate Element
- Left most and right most index
- Smallest subarray with sum greater than x
- Amend The Sentence
- Closest Strings
- Single Number
- Largest Even Number
- Remove Consecutive Characters
- Common Subsequence
- Remove b and ac from a given string
- Palindrome Sentence
- Addition of submatrix
- Sort in specific order
- Rearrange a string
- Form largest number from digits
- Remove Duplicates
- Sorting Employees
- Sum of two numbers represented as arrays
- Facing the sun
- Greater on right side
- Jumping Caterpillars
- Count Substrings
- Twice Counter
- Second Largest
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Second most repeated string in a sequence
- Check if array contains contiguous integers
- Equal point in a string of brackets
- Number of occurrence
- Maximum repeating number
- Divisible by 8
- Does array represent Heap
- Find missing in second array
- String's Count
- Largest Fibonacci Subsequence
- Meta Strings
- Maximum difference Indexes
- Substrings with same first and last characters
- Two sum -Pairs with 0 Sum
- Sum of f(a[i], a[j]) over all pairs in an array of n integers
- Maximum number of zeroes
- Large number division
- Decreasing Sequence
- Three Great Candidates
- Digits in a set
- Element with left side smaller and right side greater
- Merging two unsorted arrays in sorted order
- Count the Zeros
- Transform the array
- Sum of Lengths of Non-Overlapping SubArrays
- Sort the pile of cards
- Four Elements
- Palindrome String
- Missing ranges of numbers
- Total count
- Left out candies
- Chocolate Station
- Smallest greater elements in whole array
- Print Bracket Number
- Does robot moves circular
- Odd Even Problem
- Convertible string
- Colorful Strings
- Is Binary Number Multiple of 3
- Swap bits in byte
- Number of 1 Bits
- Find the Highest number
- Lucky Number
- Pairs with Positive Negative values
- Reverse Bits
- Star elements
- Palindrome
- Element that appears once where every element occurs twice
- Party of Couples
- Find sum of divisors
- Element in a Sequence
- Magic Number
- Count numbers containing 4
- Largest power of prime
- Reach the Nth point
- Number of Groups
- Numbers with same first and last digit
- Perfect Numbers
- Pair cube count
- Nth item through sum
- Forming Rectangle
- Day of the week
- Kth Prime Factor
- Class Average
- Increment
- Maximize Toys
- Recamans sequence
- Deficient Number
- Number of ways to find two numbers
- Total number of Strings
- Least Prime Factor
- Number of 1's in smallest repunits
- Sum of First N Natural Numbers
- Find nth root of m
- Largest Product Pallindrome
- Prime Factors
- Juggler Sequence
- Sphenic Number
- Maximum Diamonds
- Find the highest occurring digit in prime numbers in a range
- Prime number of set bits
- Inorder Traversal and BST
- Sum of Divisors in an array
- Print Pattern
- Primes sum
- Array to BST
- Sum of dependencies in a graph
- Count all possible paths from top left to bottom right
- Rotate Array
- Sort String
- Print Linked List
- Count Linked List Nodes
- Size of Binary Tree
- Count Leaves in Binary Tree
- Postorder Traversal
- Implement stack using array
- Queue using Linked List
- Queue Using Array
- Doubly linked list Insertion at given position
- Replace all 0's with 5
- Preorder Traversal
- First Occurence
- Search a node in BST
- HashMap Operations
- Palindromic Array
- Peak element
- Linked List Insertion At End
- Play with an array
- Minimum element in BST
- Anagram of String
- Circular Linked List Traversal
- Is Linked List Length Even?
- Identical Linked Lists
- Modular Node
- Sum of Binary Tree
- Insert in Middle of Linked List
- longest substring containing '1'
- Count Non-Leaf Nodes in Tree
- Bit Difference
- Binary Array Sorting
- Binary String
- Remove common characters and concatenate
- Sum of numbers in string
- Reverse a String
- Binary Array Sorting
- Rearranging array
- Count number of elements between two given elements in array
- Mega Sale
- Doubling the value
- Elements before which no element is bigger
- Balanced Array
- Maximum product of two numbers
- Value equal to index value
- Check for subsequence
- Segregate Even and Odd numbers
- Remove vowels from string
- Fighting the darkness
- Reverse sub array
- Sum of distinct elements
- Count the characters
- Uncommon characters
- Swap kth elements
- Reversing the vowels
- Remove Spaces
- Repeated Character
- Replace the Bit
- First 1 in a Sorted Binary Array
- Merge two strings
- String with numbers at its end
- Last duplicate element in a sorted array
- Exceptionally odd
- Array Subset
- Positive and negative elements
- Extract Maximum
- Print first letter of every word in the string
- Remove character
- Maximum Integer Value
- Betting game
- GCD of Array
- Check set bits
- The AND Gate
- Binary representation
- Check for Power
- Find position of set bit
- Odd Divisors
- XOR Count Zero and One
- Find the fine
- Strong Numbers
- Check if divisible by 5
- Check if a number can be expressed as x^y
- LCM And GCD
- House Robber
- Longest Increasing Subarray
- Fibonacci to N
- Binary number to decimal number
- Tough Competitors
- Absolute Difference of 1
- Closest Number
- Common Divisors
- Sum of divisors
- Multiples Power
- Angle between hour and minute hand
- Check if the door is open or closed
- Tidy Number
- Ways To Tile A Floor
- Disarium Number
- Count Squares
- Sum of Digits Divisibility
- Print the Kth Digit
- Numbers containing 0's from 1 to N
- Unique Numbers
- Repetitive Addition Of Digits
- Half N by M
- Pairs of prime number
- Minimum difference pair
- Thief trying to escape
- Finding Position
- Sum of primes
- Linked List Group Reverse
- Max rectangle
- Fixing Two nodes of a BST
- Huffman Decoding
- Trapping Rain Water
- Histogram Max Rectangular Area
- Find median in a stream
- Count Pairs in an Array
- The Painter's Partition Problem-II
- Distinct palindromic substrings
- Edit Distance
- Minimum sum partition
- Palindromic Partitioning
- Matrix Chain Multiplication
- Longest valid Parentheses
- Longest Zig-Zag Sub Sequence
- Let's Play!!!
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