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bhardwajji
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BASIC (30)
EASY (166)
MEDIUM (315)
HARD (52)
- Reverse a linked list
- Pairwise swap elements of a linked list
- Remove duplicates from an unsorted linked list
- Inorder Traversal
- Bubble 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
- Balanced Tree Check
- Kth from End of Linked List
- Middle of a Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- 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
- 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 Sorted Array
- Level Order Line by Line
- BST Keys in a Range
- Minimum Depth of a Binary Tree
- Remove duplicates in array
- Binary Tree to BST
- Unique rows in boolean matrix
- Leaves at Same Level or Not
- Match specific pattern
- Josephus problem
- Kth largest element in BST
- Array Duplicates
- Level order traversal
- Intersection of Two Linked Lists
- Reverse Using Stack
- Symmetric Tree
- Next Right Node
- Reverse first K of a Queue
- Delete Mid of a Stack
- Find the Frequency
- Longest Consecutive 1's
- Wave Array
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Print adjacency list
- Sum of upper and lower triangles
- Transpose of Matrix
- Anagram
- Winner of an election
- String Rotated by 2 Places
- Isomorphic Strings
- Reverse Words
- Minimum indexed character
- Non Repeating Character
- Parenthesis Checker
- K largest elements
- Minimum Cost of ropes
- N meetings in one room
- Largest number with given sum
- Union-Find
- Count ways to N'th Stair
- Count number of hops
- First Repeating Element
- Check Equal Arrays
- Positive Negative Pair
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Intersection of Arrays with Distinct
- Missing And Repeating
- Non-Repeating Element
- Pairs of equals Sum
- Count the elements
- Maximum no of 1's row
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- String Duplicates Removal
- Minimize the sum of product
- Move all negative elements to end
- Chocolate Distribution Problem
- Find Pair Given Difference
- Minimum number of swaps needed
- Drive the car
- Bitonic Point
- Left most and right most index
- Smallest subarray with sum greater than x
- Alternate Positive Negative
- Maximum Possible Sum of Products
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Addition of submatrix
- Remove Duplicates
- Count Substrings
- Twice Counter
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Second most repeated string in a sequence
- Find all pairs with a given sum
- Check if array is sorted
- Find missing in second array
- String's Count
- Longest Common Prefix of Strings
- First Repeated Character
- Substrings with same first and last characters
- Two sum -Pairs with 0 Sum
- Hungry Pizza Lovers
- At Least K Occurrences
- Merging two unsorted arrays in sorted order
- Count the Zeros
- Palindrome String
- Maximum average subarray
- Fitting The Array
- Adding Array Elements
- Find the Highest number
- Pairs with Positive Negative values
- Nth Fibonacci Number
- Shortest path from 1 to n
- Reach the Nth point
- Nearest Perfect Square
- Smallest number with sum of digits as N and divisible by 10^N
- Maximize Toys
- Maximum Height Tree
- Row with Minimum 1s
- Help Ishaan
- Check if it is possible to convert one string into another with given constraints
- Minimum Exchange
- Array to BST
- 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
- Sum of two numbers without using arithmetic operators
- Even and Odd
- Largest value in each level
- Maximum number of 2X2 squares
- License Key Formatting
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Move Last Element to Front of a Linked List
- Can Make Triangle
- Find pairs with given sum in doubly linked list
- Triangle and Square
- Refueling
- Geek left with No Food
- Geek & Geekina Purchasing Ice Cream
- Toggle
- Sorting Elements of an Array by Frequency
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Detect Loop in linked list
- QuickSort on Doubly 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
- Diagonal Tree Traversal
- 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
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological sort
- Vertical Tree Traversal
- Merge K sorted linked lists
- Find the number of islands
- Get Min from Stack
- Serialize and deserialize a binary tree
- Gas Station
- Wildcard Pattern Matching
- Generate IP Addresses
- Check if subtree
- Kth element in Matrix
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Largest BST
- Count Palindromic Subsequences
- Minimum Swaps to Sort
- Implement Atoi
- Palindrome Linked List
- Strongly Connected
- Print matrix in diagonal pattern
- Rat in a Maze Problem - I
- Bipartite Graph
- Number of root to leaf paths
- Closest in BST
- Pots of Gold Game
- Merge two BST 's
- Count distinct elements in every window
- k-Anagram
- Merge k Sorted Arrays
- Bridge edge in a graph
- Find triplets with zero sum
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Delete nodes greater than k
- Union of Two Linked Lists
- Ancestors in Binary Tree
- Pair Sum in BST
- Root to Leaf Paths
- Complete Binary Tree
- Counting elements in two arrays
- Foldable Binary Tree
- Leftmost and rightmost nodes of binary tree
- Construct Tree from Inorder & Preorder
- Count the nodes at distance K from leaf
- Isomorphic Trees
- Maximum path sum from any node
- Children Sum in a Binary Tree
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Maximum sum of Non-adjacent nodes
- Mother Vertex
- Tower Of Hanoi
- Smallest Positive Missing
- Possible Words From Phone Digits
- Rearrange Array Alternately
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Indexes of Subarray Sum
- Triplet Sum in Array
- Merge Without Extra Space
- Possible paths between 2 vertices
- Boolean Matrix
- Spirally traversing a matrix
- Search in a sorted Matrix
- Distance of nearest cell having 1
- 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
- K Sized Subarray Maximum
- Activity Selection
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Combination Sum
- 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
- Maximize The Cut Segments
- Print Anagrams Together
- Rotate by 90 degree
- Top K Frequent in Array
- Closest Three Sum
- Stock Buy and Sell – Multiple Transaction Allowed
- Generate Parentheses
- Word Search
- Word Boggle
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Sort 0s, 1s and 2s
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Count Occurences of Anagrams
- Painting the Fence
- Search in Rotated Sorted Array
- Maximize The Array
- Form the Largest Number
- Maximum Product Subarray
- Longest subarray with sum divisible by K
- Row with max 1s
- Swapping pairs make sum equal
- Palindrome SubStrings
- Form a palindrome
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Cutting Binary String
- Sum of two large numbers
- Max Sum without Adjacents
- Reverse each word in a given string
- k largest elements
- Longest Common Substring
- Smallest distinct window
- Longest substring with distinct characters
- Longest Substring with K Uniques
- Longest Palindrome in a String
- K-th element of two Arrays
- Longest Arithmetic Subsequence
- Rod Cutting
- K closest elements
- Maximize the sum of selected numbers from a sorted array to make it empty
- LCS of three strings
- Longest Palindromic Subsequence
- First negative in every window of size k
- Minimize the Heights II
- Smaller on Left
- Minimum Deletions
- Print N-bit binary numbers having more 1s than 0s
- Minimum number of deletions
- Permutations of a String
- Friends Pairing Problem
- Lexicographically smallest string
- Ways to sum to N
- Max possible amount
- Maximum Tip Calculator
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Coin Change (Count Ways)
- Count numbers with given sum
- Mobile numeric keypad
- Gold Mine Problem
- Coin Change (Minimum Coins)
- Dice throw
- Perfect Sum Problem
- Kth Smallest Factor
- Firing employees
- Longest subsequence-1
- Power Set
- Count ways to N'th Stair(Order does not matter)
- Knapsack with Duplicate Items
- Printing Maximum Sum Increasing Subsequence
- Number of ways
- Subsets with XOR value
- Maximum path sum in matrix
- Minimum steps to destination
- Special Keyboard
- Partition Equal Subset Sum
- Longest Bitonic subsequence
- Min Coin
- Get Minimum Squares
- Count distinct pairs with difference k
- Jumbled Strings
- Probability of Knight
- Array Pair Sum Divisibility Problem
- Count the number of ways to tile the floor of size n x m using 1 x m size tiles
- Subset Sums
- Unique partitions
- Knight Walk
- Permutation with Spaces
- Number of paths in a matrix with k coins
- Fact Digit Sum
- Party in Town
- Fraction to Repeating Decimal
- Find the Safe Position
- Smaller on Left
- Filling Bucket
- Longest Repeating Subsequence
- Composite and Prime
- Stream First Non-repeating
- Villain Con
- Largest square formed in a matrix
- Kth Largest in a Stream
- Snake and Ladder Problem
- 7 Segment Display
- Replace O's with X's
- Find all distinct subset (or subsequence) sums
- Queries on Strings
- Special Matrix
- Queries on a Matrix
- Nodes at even distance
- Help a Thief!!!
- Count the paths
- Floyd Warshall
- Negative weight cycle
- Flood fill Algorithm
- Shortest Source to Destination Path
- Police and Thieves
- Geek and Number String
- Save Your Life
- Hamiltonian Path
- Theft at World Bank
- Restrictive Candy Crush
- Help Classmates
- Closest Similar Elements
- Jump Game
- Iterative Inorder
- Preorder traversal (Iterative)
- Iterative Postorder
- Subset Sum Problem
- Longest Palindromic Substring
- Form a palindrome
- Search Pattern (Rabin-Karp Algorithm)
- All Palindromic Partitions
- Covid Spread
- Bellman-Ford
- Player with max score
- Subarrays with sum K
- Partition a Linked List around a given value
- Open the gates
- Capacity To Ship Packages Within D Days
- Coin Piles
- Rearrange characters
- Distribute N candies among K people
- Substrings of length k with k-1 distinct elements
- Binary Searchable elements
- Clone a stack without using extra space
- Number of Provinces
- Remove all occurences of duplicates in a linked list
- Minimize the Heights I
- Subsets
- Flatten binary tree to linked list
- IPL 2021 - Match Day 2
- Course Schedule
- Min Cost Climbing Stairs
- Target Sum
- Overlapping Intervals
- Find Kth permutation
- Maximum number of events that can be attended
- Farthest number
- Buy Maximum Stocks
- Smallest sum contiguous subarray
- Stack Permutations
- Wine Buying and Selling
- Replace every element with the least greater element on its right
- Minimum increment/decrement to make array non-Increasing
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Islands
- Number of Ways to Arrive at Destination
- Cheapest Flights Within K Stops
- Connecting the graph
- Maximum Stone Removal
- Make array Equal
- Maximum Points Covered
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Max rectangle
- Distinct occurrences
- LRU Cache
- Maximum subset XOR
- Alien Dictionary
- Nodes at given distance in binary tree
- Max Path Sum 2 Special Nodes
- String Permutations
- Trapping Rain Water
- 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
- Word Ladder I
- Median of 2 Sorted Arrays of Different Sizes
- Burning Tree
- Merge Without Extra Space
- The Painter's Partition Problem-II
- Distinct palindromic substrings
- Longest Prefix Suffix
- Circle of strings
- Print all LCS sequences
- Edit Distance
- Minimum Points To Reach Destination
- Minimum sum partition
- Palindromic Partitioning
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Boolean Parenthesization
- Longest valid Parentheses
- N-Queen Problem
- Closest Palindrome
- Water Connection Problem
- 132 Geeky Buildings
- 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
- Word Ladder II
- IPL 2021 - Final
- Find number of closed islands
- Stock Buy and Sell – Max 2 Transactions Allowed
- Number of pairs
- Geek in a Maze
- Maximum Connected group
- Account Merge
- Sort String
- Count Leaves in Binary Tree
- Postorder Traversal
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Peak element
- Minimum element in BST
- Reverse array in groups
- Reverse a String
- Anagram Palindrome
- Immediate Smaller Element
- Count the characters
- Uncommon characters
- Repeated Character
- Elements in the Range
- Game with nos
- Exceptionally odd
- Array Subset
- Good or Bad string
- Check perfect square
- House Robber
- Check perfect square
- Ways To Tile A Floor
- Count Squares
- Unique Numbers
- Perfect Squares in a Range
- Multiply 2 matrices
- Sorted matrix
- Max Min
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