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codeutin
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SCHOOL (1)
BASIC (69)
EASY (315)
MEDIUM (417)
HARD (59)
- Smaller on Right
- Reverse alternate nodes in Link List
- 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
- Detect Loop in linked list
- Count BST nodes that lie in a given range
- Merge Sort
- Quick 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
- Tree Boundary Traversal
- Delete a node from BST
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Maximum difference between node and its ancestor
- 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
- Linked List to Binary Tree
- Check if subtree
- Kth element in Matrix
- Validate an IP Address
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Largest BST
- Sorted subsequence of size 3
- Minimum Swaps to Sort
- Implement Atoi
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze Problem - I
- Bipartite Graph
- Closest in BST
- BST with Dead End
- Merge two BST 's
- Count distinct elements in every window
- Merge k Sorted Arrays
- 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
- Merge Sort for Linked List
- Union of Two Linked Lists
- Euler Circuit in an Undirected Graph
- Euler circuit and Path
- Binary Tree to CDLL
- Root to Leaf Paths
- Complete Binary Tree
- K Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Count the nodes at distance K from leaf
- Vertical sum
- Isomorphic Trees
- Maximum path sum from any node
- Predecessor and Successor
- Children Sum in a Binary Tree
- Normal BST to Balanced BST
- Kth Ancestor in a Tree
- Convert Level Order Traversal to BST
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Vertical Width of a Binary Tree
- Pairwise swap of nodes in LinkedList
- Swap Kth nodes from ends
- Add two numbers represented by Linked List
- Mother Vertex
- Rabin Karp - Pattern Searching
- Floor in BST
- Ceil in BST
- Pair Sum in BST
- Count total set bits
- Gray to Binary equivalent
- Maximum AND Value
- Tower Of Hanoi
- Smallest Positive Missing
- Power Of Numbers
- Maximum occured integer
- Possible Words From Phone Digits
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Maximum Index
- Stock buy and sell
- Rotate Array
- Check if array is sorted and rotated
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Two Repeated Elements
- Union of 2 Sorted with Duplicates
- Indexes of Subarray Sum
- Count the number of possible triangles
- Triplet Sum in Array
- Merge Without Extra Space
- Merge three sorted arrays
- Closer to sort
- Possible paths between 2 vertices
- Level of Nodes
- Make Matrix Beautiful
- Boolean Matrix
- Spirally traversing a matrix
- Search in a sorted Matrix
- Determinant of a Matrix
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Subarray range with given sum
- Subarrays with equal 1s and 0s
- Sort Elements by Decreasing Frequency
- Longest Consecutive Subsequence
- Case-specific Sorting of Strings
- Lexicographic Rank Of A String
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Kth largest element
- Kth smallest element
- Kth largest element in a stream
- K Most occurring elements
- Nearly sorted
- Rearrange characters
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Largest number in K swaps
- Black and White
- Combination Sum
- Unique Subsets
- M-Coloring Problem
- Minimum Jumps
- Detect Cycle using DSU
- Stickler Thief
- Longest Increasing Subsequence
- Longest Common Subsequence
- Lucky Numbers
- Sort according to an Array
- Allocate Minimum Pages
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Find whether path exist
- Kth Smallest
- Shortest Common Supersequence
- Nth Catalan Number
- Rotten Oranges
- Steps by Knight
- Most frequent word in an array of strings
- Count only Repeated
- Longest Subarray Of Evens And Odds
- Top K Frequent in Array
- Closest Three Sum
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- Word Boggle
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Maximum Water Between Two Buildings
- Sort 0s, 1s and 2s
- Pascal Triangle
- Maximum Index
- Number of subarrays with maximum values in given range
- Flip Bits
- Longest Span in two Binary Arrays
- Maximize Number of 1's
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Single Among Doubles
- Pythagorean Triplet
- Search in Rotated Sorted Array
- Maximum Intervals Overlap
- Form the Largest Number
- Subarray Sum Divisible By K
- Longest subarray with sum divisible by K
- Check if a string is repetition of its substring of k-length
- Row with max 1s
- Swapping pairs make sum equal
- Column name from a given column number
- Substrings with K Distinct
- Longest Subarray with Sum K
- count special palindromic
- Cutting Binary String
- Sum of two large numbers
- Max Sum without Adjacents
- Equal 0, 1 and 2
- Shuffle integers
- Length of the longest substring
- k largest elements
- Sum of XOR of all pairs
- Longest substring with distinct characters
- Count of substrings containing K ones
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Valid Expression
- K-th element of two Arrays
- Arranging the array
- String formation from substring
- Triplets with Smaller Sum
- Rod Cutting
- K closest elements
- Number of pairs
- Min Swaps to Group 1s
- Minimum swaps and K together
- Maximize the sum of selected numbers from a sorted array to make it empty
- Smallest Absolute Difference
- Longest Palindromic Subsequence
- Largest Sum Subarray of Size at least K
- First negative in every window of size k
- Minimum sum
- Minimize the Heights II
- Transform to prime
- First and Last Occurrences
- Next higher number in one swap
- Smaller on Left
- Minimum Deletions
- Find patterns
- Permutations of a String
- Number following a pattern
- CamelCase Pattern Matching
- Pallindrome Patterns
- Maximum Sum Subsequence of length k
- Lexicographically smallest string
- Subarrays Product Less than K
- Unique Number II
- Bleak Numbers
- Game of XOR
- Largest prime factor
- Modified Game of Nim
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Santa Banta
- Gold Mine Problem
- Perfect Sum Problem
- Find the largest number
- Count ways to N'th Stair(Order does not matter)
- Knapsack with Duplicate Items
- nCr
- Count of sum of consecutives
- Partition Equal Subset Sum
- Array Pair Sum Divisibility Problem
- Matchsticks game
- Subset Sums
- Number of paths
- Knight Walk
- Stepping Numbers
- Game of Chocolates
- Jumping Numbers
- Smith Number
- Fraction Trouble
- Missing number in matrix
- Smaller on Left
- How Many X's?
- Longest Repeating Subsequence
- Decode the string
- Stream First Non-repeating
- Maximum Sub-String after at most K changes
- Villain Con
- Possible paths
- Segregate even and odd nodes in a Linked List
- Kth Largest in a Stream
- Transitive closure of a Graph
- Replace O's with X's
- Express as sum of power of natural numbers
- Find the string in grid
- Floyd Warshall
- Flood fill Algorithm
- Shortest Source to Destination Path
- Geek and Number String
- Recursively Remove Adjacent Duplicates
- Triplets in Sorted Linked List
- Restrictive Candy Crush
- Help Classmates
- Lucy's Neighbours
- Triplets with sum with given range
- Longest Palindromic Substring
- 3 Sum Closest
- Bellman-Ford
- Subarrays with sum K
- Partition a Linked List around a given value
- Open the gates
- Substrings of length k with k-1 distinct elements
- Maximum XOR of two numbers in an array
- Number of Provinces
- Prefix match with other strings
- Check if a String is Subsequence of Other
- Paths from root with a specified sum
- Division without using multiplication, division and mod operator
- Remove all occurences of duplicates in a linked list
- Minimize the Heights I
- Subsets
- Rank The Permutations
- Anti Diagonal Traversal of Matrix
- IPL 2021 - Match Day 2
- Unique Number III
- Course Schedule
- Overlapping Intervals
- Remove and Reverse
- Find k-th smallest element in given n ranges
- Even Swap
- Reverse a Stack
- Maximum Meetings in One Room
- Enemy
- Max Equal sum of 3 Stacks
- Replace every element with the least greater element on its right
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Enclaves
- Eventual Safe States
- Rectangles and Squares
- City With the Smallest Number of Neighbors at a Threshold Distance
- Non-Negative Tree
- Number Of Islands
- Number of Ways to Arrive at Destination
- Path With Minimum Effort
- Subarray Counting
- Cheapest Flights Within K Stops
- Connecting the graph
- Shortest Path in Undirected Graph
- Maximum Stone Removal
- Shortest path in Directed Acyclic Graph
- Sum of Beauty of All Substrings
- Aggressive Cows
- Shortest Path in Weighted undirected graph
- Task Scheduler
- Hands of Straights
- Lemonade Change
- Maximum Sum Combination
- Non-overlapping Intervals
- Target Path Sum
- Make array Equal
- Floor in BST
- Make array elements unique
- Next Greater Element in Circular Array
- Carpet into Box
- Minimum X (xor) A
- Find minimum number of Laptops required
- Geeks And The String
- Maximum Points Covered
- Minimum Days
- Fill the Matrix
- Number of Good Components
- Optimal Array
- Maximum Intersecting Lines
- String rp or pr
- Knight in Geekland
- Shy Geek
- Count Special Numbers
- Minimum Steps Required
- Second smallest number
- Distinct Difference
- Maximum Length
- Remove the balls
- Unequal Arrays
- Job Sequencing Problem
- Bheem Wants Ladoos
- Prefix Suffix String
- Smaller Sum
- Fest and Posters
- Geek and the XOR Play
- Shortest XY distance in Grid
- BST Maximum Difference
- Nearest smaller tower
- Another Coin Change Problem
- Geek's Village and Wells
- Find Number
- Max Coins
- Good Subtrees
- Subtree In N-ary Tree
- Easy Task
- Add Minimum Characters
- Maximum subset sum
- Palindrome with minimum sum
- Internet Connection
- Count Total Setbits
- Tree Transformation
- Construct a Full Binary Tree
- Distinct Elements
- Modify Linked List-1
- Gathering Boulders
- Cyclic Tree
- Find Kth permutation
- Fraction pairs with sum 1
- Find the longest string
- Minimize Top Speed
- K Sum
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Pairwise swap elements of a linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Inorder Traversal
- Reverse a Doubly Linked List
- Bubble Sort
- Selection Sort
- Insertion Sort
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Maximum Width of Tree
- Delete without head pointer
- 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
- 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
- DFS of Graph
- Stack using Linked List
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Square Root
- Lowest Common Ancestor in a BST
- 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
- Binary Tree to BST
- Unique rows in boolean matrix
- Match specific pattern
- Multiply two linked lists
- Josephus problem
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Special Stack
- Three way partitioning
- Level order traversal
- Inorder Successor in BST
- Index of an Extra Element
- Insert in a Sorted List
- More than n/k Occurrences
- Reverse Using Stack
- Symmetric Tree
- Find length of Loop
- Median of BST
- Queue Reversal
- Reverse first K of a Queue
- Sum of Leaf Nodes
- Sum of Left Leaf Nodes
- Closest Neighbour in BST
- Brothers From Different Roots
- Delete Mid of a Stack
- Swap the array elements
- Predict the Column
- Need Some Change - Java
- Java ArrayList Operation
- Frequency in Queue
- Get min at pop
- Deque Implementations
- Frequency Game
- Max and Second Max
- Hashing for pair - 1
- Hashing for pair - 2
- Inorder traversal of a BST
- Levelorder traversal of a BST
- First Set Bit
- Rightmost different bit
- K-th Bit is Set or Not
- Factorial Of Number
- Digits In Factorial
- GP Term
- Primality Test
- Longest Consecutive 1's
- Exactly 3 Divisors
- Mean And Median of Array
- Modular Inverse
- Power of 2
- Swap all odd and even bits
- Minimum adjacent difference in a circular array
- Wave Array
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Count 1's in binary array
- Floor in a Sorted Array
- Minimum Number in a sorted rotated array
- Roof Top
- Intersection of two sorted arrays
- Closet 0s 1s and 2s
- Sort by Absolute Difference
- Print adjacency list
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Transpose of Matrix
- Rotate by 90 degree
- Interchanging the rows of a Matrix
- Reversing the columns of a Matrix
- Matrix Boundary Traversal
- Exchange matrix columns
- Separate chaining in Hashing
- Naive Pattern Search
- Linear Probing in Hashing
- Quadratic Probing in Hashing
- Count Non-Repeated Elements
- Print Non-Repeated Elements
- Anagram
- Winner of an election
- String Rotated by 2 Places
- Strings Rotations of Each Other
- Isomorphic Strings
- The Modified String
- Reverse Words
- Minimum indexed character
- Panagram Checking
- Non Repeating Character
- Removing consecutive duplicates
- Removing consecutive duplicates - 2
- Parenthesis Checker
- Generate Binary Numbers
- K largest elements
- Minimum Cost of ropes
- N meetings in one room
- Count Total Digits in a Number
- Digital Root
- Power Set Using Recursion
- Count number of hops
- Level them All!
- Strange Median!
- Pattern searching
- Rotate Deque By K
- First Repeating Element
- Union of Arrays with Duplicates
- Check Equal Arrays
- Nth number made of prime digits
- Numbers containing 1, 2 and 3
- Positive Negative Pair
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Intersection of Arrays with Distinct
- Count minimum right flips to set all values in an array
- Missing And Repeating
- Find Kth Rotation
- Sort by Set Bit Count
- Maximize sum after K negations
- Adding Ones
- Common in 3 Sorted Arrays
- Sorted and Rotated Minimum
- Maximum no of 1's row
- Move All Zeroes to End
- String Duplicates Removal
- Minimize the sum of product
- Move all negative elements to end
- Chocolate Distribution Problem
- Punish the Students
- Bitonic Point
- Left most and right most index
- Smallest subarray with sum greater than x
- Alternate Positive Negative
- Remaining String
- Remove Duplicates
- Reverse alternate words
- Reorganize The Array
- Count Substrings
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Rotate Bits
- Sort Unsorted Subarray
- Find all pairs with a given sum
- Number of occurrence
- Maximum repeating number
- Reversing the equation
- Rope Cutting
- Convert an array to reduced form
- Check if array is sorted
- Find missing in second array
- String's Count
- Longest Common Prefix of Strings
- Smallest number in one swap
- First Repeated Character
- Maximum number of characters between any two same character
- Two sum -Pairs with 0 Sum
- At Least K Occurrences
- Find the closest pair from two arrays
- Merge two binary Max heaps
- Palindrome String
- Search array with adjacent diff at most k
- Split the string
- Is Binary Number Multiple of 3
- Minimum Operations
- Number of 1 Bits
- Compute sum of digits in all numbers from 1 to n
- AND operation
- Max Sum Subarray of size K
- Nth Fibonacci Number
- Copy Set Bits in Range
- Toggle bits in the given range
- Set all the bits in given range of a number
- Shortest path from 1 to n
- Find maximum number
- Reach the Nth point
- Perfect Numbers
- Incomplete Array
- Discovering Atlantis
- Maximize Toys
- Largest number possible
- Least Prime Factor
- Sum of First N Natural Numbers
- Juggler Sequence
- Tom and Jerry
- Maximum Diamonds
- Surround the 1's
- Help Ishaan
- Trace Path
- Inorder Traversal and BST
- Sequence Fun
- Letters Collection
- Print Pattern
- Array to BST
- Sum of dependencies in a graph
- Count all possible paths from top left to bottom right
- Print Diagonally
- Plus One
- Minimum steps to make product equal to one
- Even and Odd
- Search insert position of K in a sorted array
- Queue using stack
- Minimum Difference in an Array
- Split the binary string into substrings with equal number of 0s and 1s
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Smallest window containing 0, 1 and 2
- Move Last Element to Front of a Linked List
- Three Numbers
- Even subarray sum
- Kth Mex
- Make sum even
- Maximum Depth Of Binary Tree
- Find the number of Matchsticks
- Geek left with No Food
- Minimum product
- Two Swaps
- Bots on social media
- Transform to Sum Tree
- Parent of Max GCD Siblings in a Binary Tree
- Find the first node of loop in linked list
- Geek & Geekina Purchasing Ice Cream
- Toggle
- Reverse both parts
- Frogs and Jumps
- Make Array Elements Equal
- Equal Left and Right Subarray Sum
- Make the array beautiful
- Remainder on dividing by 11
- Taxi Booking
- Number of Subarrays of 0's
- Maximum Identical Bowls
- Bus Conductor
- Wifi Range
- Minimum Number
- Select Maximum number
- Seating Arrangement
- String Mirror
- Powerfull Integer
- Make Palindrome
- Geekina loves order
- Maximize The Number
- Binary Modulo
- Total Cuts
- Bit Magic
- Array Operations
- Dominant Pairs
- Total Traversal Time
- Valuable String
- Special Array
- Count the Substrings
- Wave Array
- Accept The Challenge
- Antique Collections
- Binary Array
- Cousins in Tree
- Strong Students in School
- Minimum Thorns
- Ticket Counter
- Geek's Plants
- Weight Problem
- Magic and toy shop
- Unique Number of Occurrences
- Separate Stone
- Unique Positions
- Balloon Everywhere
- Maximum Number
- Two Swaps
- Beautiful Number
- Strong Students in School
- Complete the Staircase
- String Matching
- Array Game
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Subtraction in Linked List
- LRU Cache
- AVL Tree Insertion
- Alien Dictionary
- AVL Tree Deletion
- Merge Sort on Doubly Linked List
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Pattern Search KMP
- String Permutations
- Trapping Rain Water
- Max Circular Subarray Sum
- Pattern Search
- 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
- Word Ladder I
- Median of 2 Sorted Arrays of Different Sizes
- Burning Tree
- Next Smallest Palindrome
- Longest Prefix Suffix
- Number of distinct subsequences
- Wildcard string matching
- Circle of strings
- Sum-string
- Palindromic Partitioning
- Next Happy Number
- Median in a row-wise sorted Matrix
- N-Queen Problem
- Minimum X (xor) A
- Reverse a sublist of a linked list
- Word Ladder II
- Split Array Largest Sum
- Find number of closed islands
- Min Chars to Add for Palindrome
- Largest rectangular sub-matrix whose sum is 0
- Optimal Value
- Maximum Connected group
- Expression Add Operators
- Account Merge
- Better String
- Fixing Two swapped nodes of a BST
- Redundant Parenthesis
- Partition the Array
- Count Binary Strings With No Consecutive 1s
- Divide in Incremental Groups
- Minimum BST Sum Subtree
- Special Digits
- Cake Distribution Problem
- Min Time
- Game Of Subsets
- Maximum good length
- Making A Large Island
- Count Linked List Nodes
- 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
- Preorder Traversal
- First Occurence
- Search a node in BST
- Equal Sum and XOR
- Peak element
- Linked List Insertion At End
- Minimum element in BST
- Identical Linked Lists
- Insert in Middle of Linked List
- Who has the majority?
- Strongest Neighbour
- Array insert at index
- Array insert at end
- Operations on Stack
- Operations on Queue
- Absolute Value
- Convert Celsius To Fahrenheit
- Quadratic Equation Roots
- Bit Difference
- Number is sparse or not
- Binary To Gray Code equivalent
- Print 1 To N Without Loop
- Reverse array in groups
- Array Search
- Sorted Array Search
- Left Index
- Binary Array Sorting
- Adding two matrices
- Multiply the matrices
- Check if a string is Isogram or not
- Binary String
- Most Frequent Character
- Remove common characters and concatenate
- Sum of numbers in string
- Repeating Character - First Appearance Leftmost
- Sum of Digits of a Number
- Power Using Recursion
- Fibonacci Using Recursion
- Addition Under Modulo
- Multiplication Under Modulo
- Insertion in deque
- Deque Traversal
- Deque deletion
- Keypad typing
- First n Fibonacci
- Check for subsequence
- Uncommon characters
- Rotate Array by One
- Array Subset
- Min and Max in Array
- Betting game
- 1s Complement
- Check set bits
- Set kth bit
- LCM And GCD
- Sum Of Digits
- Binary number to decimal number
- G.F Series
- Print 1 to n without using loops
- Minimum difference pair
- Max Min
- Naughty Geek
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