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8 submissions in current year
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BASIC (47)
EASY (233)
MEDIUM (399)
HARD (61)
- The Conversion To One
- Get the Shadow
- Without Adjacent
- Reverse alternate nodes in Link List
- 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
- QuickSort on Doubly Linked List
- Count BST nodes that lie in a given range
- Check for BST
- Merge Sort
- Quick Sort
- Bottom View of Binary Tree
- Delete without head pointer
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Heap Sort
- Merge two sorted linked lists
- Sum Tree
- Flattening a Linked List
- Diagonal Tree Traversal
- Stack using Queue
- Tree Boundary Traversal
- Implement stack using array
- Directed Graph Cycle
- Undirected Graph Cycle
- Lowest Common Ancestor in a BST
- 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
- Find the number of islands
- Find kth element of spiral matrix
- Max sum in the configuration
- Get Min from Stack
- Wildcard Pattern Matching
- Generate IP Addresses
- Validate an IP Address
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Count Palindromic Subsequences
- Multiply two strings
- Minimum Swaps to Sort
- Implement Atoi
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze
- Bipartite Graph
- Closest in BST
- BST with Dead End
- Pots of Gold Game
- Merge k Sorted Arrays
- Longest Palindrome in Linked List
- Find triplets with zero sum
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Find Common Nodes in two BSTs
- Peak element
- Polynomial Addition
- Delete nodes greater than k
- Union of Two Linked Lists
- Euler circuit and Path
- Binary Tree to CDLL
- Pair Sum in BST
- Root to Leaf Paths
- Complete Binary Tree
- Counting elements in two arrays
- K Sum Paths
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct Tree from Inorder & Preorder
- Vertical sum
- Isomorphic Trees
- Maximum path sum
- Predecessor and Successor
- Find length of Loop
- Median of BST
- Normal BST to Balanced BST
- Kth Ancestor in a Tree
- ZigZag Tree Traversal
- Pairwise swap of nodes in Linked List
- Swap Kth nodes from ends
- Mother Vertex
- Ceil in BST
- Count set bits
- Tower Of Hanoi
- Reverse array in groups
- Smallest Positive Missing
- Power Of Numbers
- Maximum occured integer
- Wave Array
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Maximum Index
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Two Repeated Elements
- Union of 2 Sorted Arrays
- Indexes of Subarray Sum
- Triplet Sum in Array
- Merge Without Extra Space
- Level of Nodes
- Make Matrix Beautiful
- Boolean Matrix
- Spirally traversing a matrix
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Sort Elements by Decreasing Frequency
- Longest Consecutive Subsequence
- Strings Rotations of Each Other
- Case-specific Sorting of Strings
- Stock span problem
- Next Greater Element
- K Sized Subarray Maximum
- Minimum Cost of ropes
- Nearly sorted
- Find median in a stream
- Activity Selection
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Black and White
- Target Sum Combinations
- M-Coloring Problem
- Minimum Jumps
- Detect Cycle using DSU
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- 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
- Count subsequences of type a^i, b^j, c^k
- Rotate by 90 degree
- Top K Frequent in Array
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Sort 0s, 1s and 2s
- Complement
- Maximum Sub Array
- Pascal Triangle
- Maximum Index
- Number of subarrays with maximum values in given range
- Flip Bits
- Sum of Middle elements of two sorted arrays
- Equivalent Sub-Arrays
- Single Among Doubles in a Sorted
- Count of Subarrays
- Single Among Doubles
- Pythagorean Triplet
- Search in Rotated Sorted Array
- Smallest number with at least n trailing zeroes in factorial
- Count Full Binary Trees
- Form the Largest Number
- Alternate Vowel and Consonant String
- Add Binary Strings
- Maximum Product Subarray
- Row with max 1s
- Swapping pairs make sum equal
- Column name from a given column number
- Substrings with K Distinct
- Form a palindrome
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Next Smaller Element
- Number of positive integral solutions
- Cutting Binary String
- Sum of two large numbers
- Max Sum without Adjacents
- Factorials of large numbers
- Shuffle integers
- Length of the longest substring
- k largest elements
- Sum of XOR of all pairs
- Magnet Array Problem
- Longest Common Substring
- Smallest distinct window
- Longest Substring with K Uniques
- Longest Palindrome in a String
- K-th element of two Arrays
- Arranging the array
- String formation from substring
- Triplets with Smaller Sum
- Rod Cutting
- Minimum swaps and K together
- Maximize the sum of selected numbers from a sorted array to make it empty
- Longest Palindromic Subsequence
- First negative in every window of size k
- Minimum sum
- Build the smallest
- Minimize the Heights II
- First and Last Occurrences
- Reaching the heights
- Smaller on Left
- Minimum Deletions
- Find patterns
- Permutations of a String
- Number following a pattern
- Friends Pairing Problem
- String Subsequence Game
- CamelCase Pattern Matching
- Lexicographically smallest string
- Subarrays Product Less than K
- Unique Number II
- Bleak Numbers
- Largest prime factor
- 3 Divisors
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Santa Banta
- Coin Change (Minimum Coins)
- Perfect Sum Problem
- Power Of 2 and Subsequences
- Firing employees
- Shreyansh and his bits
- Power Set
- Minimum Cost To Make Two Strings Identical
- Knapsack with Duplicate Items
- nCr
- Number of ways
- Maximum path sum in matrix
- Partition Equal Subset Sum
- Longest Bitonic subsequence
- Min Coin
- Count possible ways to construct buildings
- Count digit groupings of a number
- Magic Triplets
- Brain Game
- Fill up buckets
- Matchsticks game
- Subset Sums
- Unique partitions
- Fill the Tank
- Number of paths
- Knight Walk
- Stepping Numbers
- LCM Triplet
- Find nth root of m
- Fact Digit Sum
- Jumping Numbers
- Grouping Of Numbers
- Find the Safe Position
- Next Permutation
- Smaller on Left
- Geek and knots
- Filling Bucket
- How Many X's?
- Matrix Exponentiation
- Longest Repeating Subsequence
- Composite and Prime
- Finding Profession
- Decode the string
- Stream First Non-repeating
- Maximum Sub-String after at most K changes
- 2D Hopscotch
- Print leaf nodes from preorder traversal of BST
- Longest Perfect Piece
- Geek and Strings
- The Smurfs
- Satisfy the equation
- Transitive closure of a Graph
- Replace O's with X's
- Two odd Occuring
- Find all distinct subset (or subsequence) sums
- Special Matrix
- Queries on a Matrix
- Express as sum of power of natural numbers
- Find the string in grid
- Shortest Uncommon Subsequence
- Help a Thief!!!
- Count the paths
- Floyd Warshall
- Flood fill Algorithm
- Shortest Source to Destination Path
- Base Equivalence
- Reverse Spiral Form of Matrix
- Geek and Number String
- Save Your Life
- Hamiltonian Path
- Jump Game
- Subset Sum Problem
- 3 Sum Closest
- Bellman-Ford
- Capacity To Ship Packages Within D Days
- Substrings of length k with k-1 distinct elements
- Count pairs in array divisible by K
- Number of Provinces
- Prefix match with other strings
- Binary Matrix with at most K 1s
- Maximum sum leaf to root path
- Maximum GCD of siblings of a binary tree
- BST to max heap
- BST to greater sum tree
- Minimize the Heights I
- Subsets
- Flatten binary tree to linked list
- IPL 2021 - Match Day 2
- Course Schedule
- Find and Replace in String
- Target Sum
- Overlapping Intervals
- Longest Possible Route in a Matrix with Hurdles
- Find k-th smallest element in given n ranges
- Even Swap
- Reverse a Stack
- K-th Largest Sum Contiguous Subarray
- Maximum Meetings in One Room
- Enemy
- Max Equal sum of 3 Stacks
- Levels Of Game
- Smallest sum contiguous subarray
- Array Removals
- Minimum Cost to cut a board into squares
- Validate Stack Operations
- Replace every element with the least greater element on its right
- Minimum Swaps
- Construct Binary Tree from String with bracket representation
- Check if all levels of two trees are anagrams or not
- Remove and Reverse
- Jumping Towers
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Enclaves
- Eventual Safe States
- City With the Smallest Number of Neighbors at a Threshold Distance
- Number Of Islands
- Merging Details
- Number of Ways to Arrive at Destination
- Path With Minimum Effort
- 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
- Koko Eating Bananas
- Search in Rotated Array 2
- Maximum Consecutive Ones
- Frog Jump
- Stock Buy and Sell – with Cooldown
- Aggressive Cows
- Smallest Divisor
- Combination Sum II
- Check if there exists a subsequence with sum K
- Shortest Path in Weighted undirected graph
- Minimum days to make M bouquets
- Task Scheduler
- Hands of Straights
- Buy Stock with Transaction Fee
- Number of Longest Increasing Subsequence
- Maximum Sum Combination
- Longest String Chain
- Partitions with Given Difference
- Floor in BST
- Triangle Path Sum
- Largest Divisible Subset
- Find the first node of loop in linked list
- Connect Nodes at Same Level
- Unique Paths in a Grid
- Fill the Matrix
- Maximum Intersecting Lines
- Count Total Setbits
- Tree Transformation
- Construct a Full Binary Tree
- Modify Linked List-1
- Find Kth permutation
- Remove the balls
- Fraction pairs with sum 1
- Total pairs
- Subarray of length 2
- Minimum Distance Graph
- Search in an almost Sorted Array
- Nearest Perfect Square
- A Boolean Matrix Problem
- Toggle The Middle
- Reverse 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
- Insertion Sort
- Right View of Binary Tree
- 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
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Postorder Traversal
- Level Order in spiral form
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Square Root
- Insertion at doubly linked list
- Binary Search
- Remove Duplicates Sorted Array
- Binary Tree to BST
- Unique rows in boolean matrix
- Josephus problem
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Three way partitioning
- Inorder Successor in BST
- Index of an Extra Element
- Insert in a Sorted List
- More than n/k Occurrences
- Symmetric Tree
- Next Right Node
- Leaf under budget
- Queue Reversal
- Find Sum Pairs Across Two BSTs
- Delete Mid of a Stack
- Predict the Column
- Find the Frequency
- Frequency in Queue
- Get min at pop
- Deque Implementations
- Frequency Game
- Duplicate Elements
- Max and Second Max
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- 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
- Minimum adjacent difference in a circular 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
- Print adjacency list
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Transpose of Matrix
- Matrix Boundary Traversal
- Anagram
- String Rotated by 2 Places
- Isomorphic Strings
- Reverse Words
- Non Repeating Character
- Parenthesis Checker
- K largest elements
- N meetings in one room
- Union-Find
- Count number of hops
- Deque deletion
- Rotate Deque By K
- First Repeating Element
- Union of Arrays with Duplicates
- Check Equal Arrays
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Intersection of Arrays with Distinct
- Max Value Permutation
- Missing And Repeating
- Non-Repeating Element
- Find Kth Rotation
- Sort by Set Bit Count
- k sorted array
- Maximize sum after K negations
- Adding Ones
- Pairs with certain difference
- Common in 3 Sorted Arrays
- Sorted and Rotated Minimum
- 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
- Min sum formed by digits
- Minimize the sum of product
- Move all negative elements to end
- Chocolate Distribution Problem
- Swap and Maximize
- Bitonic Point
- Smallest subarray with sum greater than x
- Sort Array II
- Alternate Positive Negative
- Count Substrings
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Rotate Bits
- Find all pairs with a given sum
- Number of occurrence
- Reversing the equation
- Check if array is sorted
- Sum Pair closest to target
- Longest Common Prefix of Strings
- Two sum -Pairs with 0 Sum
- At Least K Occurrences
- Element with left side smaller and right side greater
- Find the closest pair from two arrays
- Count the Zeros
- Merge two binary Max heaps
- Palindrome String
- Search array with adjacent diff at most k
- Fitting The Array
- K-th missing element
- Balanced string
- Is Binary Number Multiple of 3
- Minimum Operations
- Adding Array Elements
- Number of 1 Bits
- Nth Fibonacci Number
- Change Bits
- Copy Set Bits in Range
- Shortest path from 1 to n
- Sum 1 to n Divisors
- The Bit Game
- Minimum number of Coins
- Number Of Open Doors
- Perfect Numbers
- Smallest number with sum of digits as N and divisible by 10^N
- Largest number possible
- Form a number divisible by 3 using array digits
- Least Prime Factor
- Sum of First N Natural Numbers
- Tom and Jerry
- Maximum Diamonds
- Make Zeroes
- Surround the 1's
- Help Ishaan
- Trace Path
- Inorder Traversal and BST
- Sequence Fun
- Letters Collection
- Print Pattern
- Primes sum
- Print the pattern
- Chicks in a Zoo
- Maximum Sum LCM
- Check if it is possible to convert one string into another with given constraints
- Minimum Exchange
- Earthquake and the Paint Shop
- Sum of dependencies in a graph
- Count all possible paths from top left to bottom right
- Ball coloring
- Modified Numbers and Queries
- Sum of k smallest elements in BST
- Print Diagonally
- Plus One
- Maximum number of 2X2 squares
- License Key Formatting
- Find all possible paths from top to bottom
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Move Last Element to Front of a Linked List
- Find pairs with given sum in doubly linked list
- Equal Left and Right Subarray Sum
- Seating Arrangement
- Maximum occurring digit
- Assign Tasks
- Maximum Depth Of Binary Tree
- Bus Ticket Change
- Parent of Max GCD Siblings in a Binary Tree
- Frogs and Jumps
- Make Array Elements Equal
- Remainder on dividing by 11
- Maximum Identical Bowls
- Bus Conductor
- Minimum Integer
- Make Palindrome
- Dominant Pairs
- Minimum Thorns
- Ticket Counter
- Geek's Plants
- Happy Friends
- Weight Problem
- Level of Node in Tree
- Unique Number of Occurrences
- Separate Stone
- Balloon Everywhere
- Maximum Number
- Two Swaps
- Strong Students in School
- Complete the Staircase
- String Matching
- Silver and Gold
- Mean BST
- High Frequency
- Weird Island
- Find Bots on Geeklandster
- Ceil in a Sorted Array
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Distinct occurrences
- AVL Tree Insertion
- Partition array to k subsets
- Alien Dictionary
- Smallest range in K lists
- AVL Tree Deletion
- Nodes at given distance in binary tree
- Number of Turns in Binary Tree
- String Permutations
- Trapping Rain Water
- Histogram Max Rectangular Area
- Solve the Sudoku
- Minimum Cost Path
- Word Ladder I
- Median of 2 Sorted Arrays of Different Sizes
- Burning Tree
- Next Smallest Palindrome
- The Painter's Partition Problem-II
- Count Smaller elements
- Number of distinct subsequences
- Sum-string
- Edit Distance
- Minimum sum partition
- Number Formation
- Palindromic Partitioning
- Next Happy Number
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Median in a row-wise sorted Matrix
- Bike Racing
- Word Break - 2
- N-Queen Problem
- Brackets in Matrix Chain Multiplication
- Phone directory
- Assignment Problem
- Search Pattern (Rabin-Karp Algorithm)
- Minimum X (xor) A
- Sorted Linked List to BST
- Array Partition
- Count occurrences of a given word in a 2-d array
- Reverse a sublist of a linked list
- Word Ladder II
- Split Array Largest Sum
- Find number of closed islands
- Shortest Path by Removing K walls
- Find the String
- Articulation Point - I
- Min Chars to Add for Palindrome
- Minimum time to fulfil all orders
- Maximum Connected group
- Expression Add Operators
- Count Reverse Pairs
- Account Merge
- Chocolates Pickup
- Better String
- Min Time
- Making A Large Island
- Rotate Array
- Print Linked List
- Find Length of Linked List
- Queue Using Array
- Replace all 0's with 5
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Palindromic Array
- Linked List Insertion At End
- Identical Linked Lists
- Insert in Middle of Linked List
- Alternates in an Array
- Who has the majority?
- Strongest Neighbour
- Array insert at index
- Array insert at end
- Absolute Value
- Convert Celsius To Fahrenheit
- Quadratic Equation Roots
- Bit Difference
- Number is sparse or not
- Binary To Gray Code Conversion
- Array Search
- Sorted Array Search
- Left Index
- Addition Under Modulo
- Multiplication Under Modulo
- Reverse a String
- Insertion in deque
- Deque Traversal
- First n Fibonacci
- Binary Array Sorting
- Value equal to index value
- Repeated Character
- First 1 in a Sorted Binary Array
- Max and Min Product from 2 Arrays
- Elements in the Range
- Largest Element in Array
- Rotate Array by One
- Game with nos
- One odd Occuring
- Array Subset
- Min and Max in Array
- Set kth bit
- House Robber
- Max Min