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150 submissions in current year
SCHOOL (0)
BASIC (21)
EASY (205)
MEDIUM (272)
HARD (40)
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Quick Sort on Linked List
- Insert in Sorted Circular Linked List
- 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
- Sum Tree
- Construct Binary Tree from Parent Array
- Tree Boundary Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- Max sum path in two arrays
- The Celebrity Problem
- Topological sort
- Merge K sorted linked lists
- Find the number of islands
- 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
- Kth element in Matrix
- Is Binary Tree Heap
- Validate an IP Address
- Remove loop in Linked List
- Additive sequence
- Largest BST
- Sorted subsequence of size 3
- Multiply two strings
- Implement Atoi
- Maximum Difference
- Palindrome Linked List
- Print matrix in diagonal pattern
- Rat in a Maze Problem - I
- Merge two BST 's
- Count distinct elements in every window
- Root to leaf paths sum
- Bridge edge in a graph
- k-th Smallest in BST
- Euler Circuit in an Undirected Graph
- Ancestors in Binary Tree
- Pair Sum in BST
- Root to Leaf Paths
- Populate Inorder Successor for all nodes
- XOR Linked List
- Counting elements in two arrays
- Linked List that is Sorted Alternatingly
- K Sum Paths
- Construct Tree from Inorder & Preorder
- Arrange Consonants and Vowels
- Vertical sum
- Insert in Sorted way in a Sorted DLL
- Maximum path sum from any node
- Children Sum in a Binary Tree
- Diagonal sum in binary tree
- Deletion and Reverse in Circular Linked List
- Duplicate Subtrees
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Vertical Width of a Binary Tree
- Gray to Binary equivalent
- Smallest Positive Missing
- Maximum occured integer
- Rotate and delete
- Maximum Index
- Rotate Array
- 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
- Number of pairs
- Merge Without Extra Space
- Spirally traversing a matrix
- Search in a sorted Matrix
- Determinant of a Matrix
- Subarray range with given sum
- Sort Elements by Decreasing Frequency
- Longest Consecutive Subsequence
- Case-specific Sorting of Strings
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- K Sized Subarray Maximum
- Nearly sorted
- Activity Selection
- Job Sequencing Problem
- Minimum Platforms
- Minimum Jumps
- Stickler Thief
- Ways to Reach the n'th Stair
- Optimal Strategy For A Game
- Sum of all substrings of a number
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Allocate Minimum Pages
- Kth Smallest
- Rotten Oranges
- Maximize The Cut Segments
- Container With Most Water
- Print Anagrams Together
- Rotate by 90 degree
- Closest Three Sum
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- Sort 0s, 1s and 2s
- Paths to reach origin
- Pascal Triangle
- Longest Span in two Binary Arrays
- Sum of Middle elements of two sorted arrays
- Split the Array
- Pythagorean Triplet
- Search in Rotated Sorted Array
- Sum of bit differences
- Max Score from Subarray Mins
- Form the Largest Number
- Add Binary Strings
- Maximum Product Subarray
- Sort the given array after applying the given equation
- Row with max 1s
- Swapping pairs make sum equal
- Check if frequencies can be equal
- Column name from a given column number
- Palindrome SubStrings
- Form a palindrome
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Max Sum without Adjacents
- Find the N-th character
- k largest elements
- Longest Common Substring
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- K-th element of two Arrays
- K closest elements
- Missing element of AP
- LCS of three strings
- Longest Palindromic Subsequence
- Largest Sum Subarray of Size at least K
- Equalize the Towers
- Minimum sum
- Not a subset sum
- Minimize the Heights II
- First and Last Occurrences
- Minimum Deletions
- Print N-bit binary numbers having more 1s than 0s
- Permutations of a String
- Sum of Products
- Unique Number II
- Modular Exponentiation for large numbers
- Game of XOR
- Maximum Tip Calculator
- Modified Game of Nim
- Minimum number of deletions and insertions
- Maximize dot product
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Coin Change (Count Ways)
- String Subsequence
- Mobile numeric keypad
- Coin Change (Minimum Coins)
- Smallest number
- Trail of ones
- K-Palindrome
- Longest subsequence-1
- Power Set
- Count ways to N'th Stair(Order does not matter)
- Minimum Cost To Make Two Strings Identical
- nCr
- Geek and its Game of Coins
- Minimum steps to destination
- Partition Equal Subset Sum
- Count possible ways to construct buildings
- Prime Pair with Target Sum
- Nth Natural Number
- Game with String
- Next Permutation
- Maximum sum of hour glass
- How Many X's?
- Exit Point in a Matrix
- Longest alternating subsequence
- Rotate Each Row of Matrix K Times
- Decode the string
- Total Decoding Messages
- Check If two Line segments Intersect
- Number of Rectangles in a Circle
- Largest square formed in a matrix
- Integral Points Inside Triangle
- Rohan's Love for Matrix
- Largest subsquare surrounded by X
- Divisibility tree
- Police and Thieves
- Subset Sum Problem
- Search Pattern (Rabin-Karp Algorithm)
- Subarrays with sum K
- Substrings of length k with k-1 distinct elements
- Construct list using given q XOR queries
- Find duplicate rows in a binary matrix
- Remove all occurences of duplicates in a linked list
- Minimize the Heights I
- Anti Diagonal Traversal of Matrix
- Unique Number III
- All Unique Permutations of an array
- Min Cost Climbing Stairs
- Overlapping Intervals
- Maximum product subset of an array
- Buy Maximum Stocks
- Exactly one swap
- Find shortest safe route in a matrix
- Sort a k sorted doubly linked list
- City With the Smallest Number of Neighbors at a Threshold Distance
- Path With Minimum Effort
- Shortest Path in Undirected
- Majority Element II
- Koko Eating Bananas
- Longest subarray with Atmost two distinct integers
- Minimal Cost
- Aggressive Cows
- Smallest Divisor
- Combination Sum II
- Shortest Path in Weighted undirected graph
- Minimum Absolute Difference In BST
- Non-overlapping Intervals
- Stickler Thief II
- Insert Interval
- Longest String Chain
- Partitions with Given Difference
- Make array elements unique
- Minimum repeat to make substring
- Prime List
- Unique Paths in a Grid
- Number of Good Components
- Minimum Steps Required
- Maximum Length
- Remove the balls
- Smaller Sum
- Add Minimum Characters
- Count Total Setbits
- Last Fairy Standing
- Minimize the Difference
- Maximum Bridges
- Pairs violating the BST property
- Kth common ancestor in BST
- Find Max Inversions
- Exotic Subsequences
- Kth Missing Positive Number in a Sorted Array
- Count Subarrays with given XOR
- Set Matrix Zeroes
- Palindromic Substrings
- Find All Triplets with Zero Sum
- Split array in three equal sum subarrays
- Search in an almost Sorted Array
- Find H-Index
- Count all triplets with given sum in sorted array
- Implement Pow
- Subarrays With At Most K Distinct Integers
- K Closest Points to Origin
- Longest Bounded-Difference Subarray
- Lexicographically Largest String After Deleting K Characters
- Group Balls by Sequence
- Reverse a linked list
- Frequency in a Linked List
- Linked list of strings forms a palindrome
- Delete in a Doubly Linked List
- Inorder Traversal
- Reverse a Doubly Linked List
- Check for BST
- K distance from root
- Mirror Tree
- Delete without head pointer
- Height of Binary Tree
- Middle of a Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Decimal Equivalent of Binary Linked List
- Reverse Level Order Traversal
- DFS of Graph
- BFS of graph
- Root to leaf path sum
- Square Root
- Nodes without a Sibling
- Lowest Common Ancestor in a BST
- Binary Search
- Largest subarray of 0's and 1's
- Remove duplicates in array
- Toeplitz matrix
- Remove every k'th node
- Leaves at Same Level or Not
- Multiply two linked lists
- You and your books
- Max distance between same elements
- Array Duplicates
- Three way partitioning
- Level order traversal
- Index of an Extra Element
- Insert in a Sorted List
- Split Linked List Alternatingly
- Sum of leaf nodes in BST
- More than n/k Occurrences
- Symmetric Tree
- Delete Alternate Nodes
- Find the Sum of Last N nodes of the Linked List
- Count Pairs whose sum is equal to X
- Find length of Loop
- Linked List Matrix
- Remove Half Nodes
- Closest Neighbour in BST
- Swap the array elements
- Predict the Column
- Xoring and Clearing
- Reverse an Array
- First Set Bit
- Rightmost different bit
- K-th Bit is Set or Not
- Power of 2
- Wave Array
- Equilibrium Point
- Array Leaders
- Roof Top
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Transpose of Matrix
- Rotate by 90 degree
- Anagram
- Winner of an election
- Strings Rotations of Each Other
- Reverse Words
- Panagram Checking
- Non Repeating Character
- Parenthesis Checker
- Minimum Cost of ropes
- N meetings in one room
- Reach a given score
- Count ways to N'th Stair
- Count number of hops
- Union of Arrays with Duplicates
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Max Value Permutation
- Missing And Repeating
- Count the elements
- Find the closest number
- Sorted and Rotated Minimum
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- String Duplicates Removal
- Count pairs Sum in matrices
- Find Pair Given Difference
- Pairs with difference k
- Swap and Maximize
- Bitonic Point
- Single Number
- Alternate Positive Negative
- Remaining String
- Kth distance
- Remove Duplicates
- Nearest multiple of 10
- Reorganize The Array
- Facing the sun
- Second Largest
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Rotate Bits
- Number of occurrence
- K-Pangrams
- Does array represent Heap
- C++ Visible Numbers
- Modify the Array
- Sum Pair closest to target
- Find missing in second array
- Longest Common Prefix of Strings
- Substrings with same first and last characters
- Segregate 0s and 1s
- Play With OR
- At Least K Occurrences
- Palindrome String
- Total count
- Pair with given sum in a sorted array
- Print Bracket Number
- Odd Even Problem
- Binary representation of next number
- Padovan Sequence
- Extract the Number from the String
- 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
- Maximum Sum Problem
- Party of Couples
- Count numbers containing 4
- Perfect Numbers
- Recamans sequence
- The Palindrome Pattern
- Compare two fractions
- Sum of First N Natural Numbers
- Recursive sequence
- Juggler Sequence
- Summed Matrix
- Row with Minimum 1s
- Coverage of all Zeros in a Binary Matrix
- Inorder Traversal and BST
- Print Pattern
- Array to BST
- Find maximum volume of a cuboid
- Smallest window containing 0, 1 and 2
- Insert an Element at the Bottom of a Stack
- Fibonacci series up to Nth term
- Stock Buy and Sell – Max one Transaction Allowed
- Divisor Game
- Find the first node of loop in linked list
- Equal Left and Right Subarray Sum
- Remainder on dividing by 11
- Minimum Number
- Antique Collections
- Check Anagram Existence
- Beautiful Number
- Complete the Staircase
- Negative Prefix
- Is it a Leap Year
- Maximum Happiness
- Minimum Distance
- Array Game
- Find fun(x)
- Magic Array
- Not a palindromic string
- Chocolate Distribution
- Equality
- Minimum Number of Elements
- Check for Consecutive
- Frequency of every Element
- Geek & Geekina Purchasing Ice Cream
- Eye's Contact
- Geek Count
- And is Equal to OR
- Reach Alice
- Two Smallests in Every Subarray
- Split an array into two equal Sum subarrays
- Largest Pair Sum
- Perfect Meeting
- Validate distribution
- Find Smallest
- Winner Team
- Maximum Sum
- Geek String
- Distribute Balls
- Two Swaps
- Maximize partitions in a String
- Smallest Substring
- Count pairs with given sum
- Meeting Rooms
- Count Pairs whose sum is less than target
- Max Splits
- Union of Two Sorted Arrays with Distinct Elements
- Intersection of Two arrays with Duplicate Elements
- Search in a row-wise sorted matrix
- Count the Substrings
- Find Only Repetitive Element from 1 to n-1
- Can you sort the array
- Unique Number I
- Linked List Group Reverse
- Binary Tree to DLL
- Clone List with Next and Random
- LRU Cache
- Alien Dictionary
- Merge Sort on Doubly Linked List
- Fixing Two nodes of a BST
- Trapping Rain Water
- Max Circular Subarray Sum
- 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
- Burning Tree
- Count Pairs in an Array
- The Painter's Partition Problem-II
- Search Pattern (KMP-Algorithm)
- Count Smaller elements
- Longest Prefix Suffix
- Circle of strings
- Longest repeating and non-overlapping substring
- Sub-arrays with equal number of occurences
- Edit Distance
- Minimum Points To Reach Destination
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Strictly Increasing Array
- Generalised Fibonacci numbers
- Boolean Parenthesization
- Longest valid Parentheses
- Possible Paths in a Tree
- N-Queen Problem
- Kth Smallest Number in Multiplication Table
- Stock Buy and Sell – Max 2 Transactions Allowed
- Min Chars to Add for Palindrome
- Maximum Connected group
- Minimize Max Distance to Gas Station
- Account Merge
- Count Linked List Nodes
- Peak element
- Minimum element in BST
- Is Linked List Length Even?
- Identical Linked Lists
- Triplet Family
- Reverse a String
- First n Fibonacci
- At least two greater elements
- Alternative Sorting
- Find element at a given Index
- Jay's Apples
- Java 1-d and 2-d Array
- Friend of x
- Naughty Geek
- Valid Strings
- Time Travel
- Who has the majority?
- Geekland Elections
- Valid Triangle
- Disk Placement
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