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SCHOOL (2)
BASIC (49)
EASY (229)
MEDIUM (272)
HARD (27)
- Rearrange characters
- 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
- 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
- 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
- Add all greater values to every node in a BST
- Sum Tree
- Connect Nodes of Levels
- Flattening a Linked List
- Diagonal Tree Traversal
- Tree Boundary Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Absolute List Sorting
- 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
- Get Min from Stack
- Serialize and deserialize a binary tree
- Gas Station
- Wildcard Pattern Matching
- Linked List to Binary Tree
- Check if subtree
- Kth element in Matrix
- Clone a Binary Tree
- Validate an IP Address
- Remove loop in Linked List
- Minimum Spanning Tree
- Largest BST
- Interleaved Strings
- Sorted subsequence of size 3
- Multiply two strings
- Minimum Swaps to Sort
- Implement Atoi
- Palindrome Linked List
- Strongly Connected
- Print matrix in diagonal pattern
- Rat in a Maze Problem - I
- BST with Dead End
- Merge two BST 's
- Count distinct elements in every window
- k-Anagram
- Merge k Sorted Arrays
- Root to leaf paths sum
- Longest Palindrome in Linked List
- Bridge edge in a graph
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Polynomial Addition
- Merge Sort for Linked List
- Union of Two Linked Lists
- Euler Circuit in an Undirected Graph
- Binary Tree to CDLL
- Populate Inorder Successor for all nodes
- Counting elements in two arrays
- Construct expression tree
- Linked List that is Sorted Alternatingly
- K Sum Paths
- Leftmost and rightmost nodes of binary tree
- Construct Tree from Inorder & Preorder
- Arrange Consonants and Vowels
- Count the nodes at distance K from leaf
- Vertical sum
- Isomorphic Trees
- Predecessor and Successor
- Largest Independent Set Problem
- Diagonal sum in binary tree
- Normal BST to Balanced BST
- Duplicate Subtrees
- Construct Tree from Preorder Traversal
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Diagonal Sum
- Coin Change - Minimum number of coins
- Swap Kth nodes from ends
- Maximum sum of Non-adjacent nodes
- Ceil in BST
- Smallest Positive Missing
- Possible Words From Phone Digits
- Rearrange an array with O(1) extra space
- Maximum Index
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Unique BST's
- Union of 2 Sorted with Duplicates
- Indexes of Subarray Sum
- Count the number of possible triangles
- Triplet Sum in Array
- Merge Without Extra Space
- 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
- Subarrays with equal 1s and 0s
- Longest Consecutive Subsequence
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Rearrange characters
- Activity Selection
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Largest number in K swaps
- Combination Sum
- Unique Subsets
- M-Coloring Problem
- Minimum Jumps
- Stickler Thief
- Ways to Reach the n'th Stair
- Egg Dropping Puzzle
- Optimal Strategy For A Game
- Minimum number of jumps
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Lucky Numbers
- Number of Unique Paths
- Equal Sum Partition
- Sort according to an Array
- 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
- Container With Most Water
- Print Anagrams Together
- Rotate by 90 degree
- Overlapping Intervals
- Top K Frequent in Array
- Maximum Subarray Sum
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- Parcel Store
- Word Boggle
- Maximum Path Sum from Root to Leaf when flipped
- Hard Arrangement
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Paths to reach origin
- Top k numbers in a stream
- Maximize Number of 1's
- Painting the Fence
- Form the Largest Number
- Water Collection
- Maximum Product Subarray
- Longest subarray with sum divisible by K
- Row with max 1s
- Swapping pairs make sum equal
- Design a tiny URL or URL shortener
- Palindrome SubStrings
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Count the Reversals
- Max Sum without Adjacents
- Reverse each word in a given string
- Length of the longest substring
- k largest elements
- Longest Common Substring
- Longest Palindrome in a String
- Valid Expression
- String formation from substring
- Rod Cutting
- Pick Values
- LCS of three strings
- First negative in every window of size k
- Maximum difference of zeros and ones in binary string
- Minimum sum
- Roll the characters of a String
- Minimize the Heights II
- First and Last Occurrences
- Minimum Deletions
- Valid Substring
- Permutations of a String
- Number following a pattern
- Friends Pairing Problem
- Unique Number II
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Coin Change (Count Ways)
- String Subsequence
- Coin Change (Minimum Coins)
- Number of subsequences in a string divisible by n
- Palindromic Strings
- Smallest number
- Longest subsequence-1
- Power Set
- Count ways to N'th Stair(Order does not matter)
- Minimum Cost To Make Two Strings Identical
- Knapsack with Duplicate Items
- nCr
- Maximum path sum in matrix
- Partition Equal Subset Sum
- Longest Bitonic subsequence
- Min Coin
- 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
- Number of paths
- Permutation with Spaces
- Coins and Game
- Number of paths in a matrix with k coins
- Choose and Swap
- Game with String
- Fraction to Repeating Decimal
- Find the Safe Position
- Next Permutation
- Longest Repeating Subsequence
- Longest alternating subsequence
- Is Sudoku Valid
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Largest square formed in a matrix
- Check Mirror in N-ary tree
- Special Matrix
- Floyd Warshall
- Flood fill Algorithm
- Shortest Source to Destination Path
- Maximum sum Rectangle
- Hamiltonian Path
- Recursively Remove Adjacent Duplicates
- Jump Game
- Iterative Inorder
- Preorder traversal (Iterative)
- Iterative Postorder
- Form a palindrome
- Covid Spread
- Bellman-Ford
- Subarrays with sum K
- Partition a Linked List around a given value
- Rearrange characters
- Anti Diagonal Traversal of Matrix
- Odd Triplets
- Overlapping Intervals
- Reverse a Stack
- All Primes
- Linked List Group Reverse
- Binary Tree to DLL
- Min distance between two given nodes of a Binary Tree
- Distinct occurrences
- Partition array to k subsets
- Fixing Two nodes of a BST
- Max Path Sum 2 Special Nodes
- String Permutations
- Trapping Rain Water
- Smallest window containing all characters of another string
- Histogram Max Rectangular Area
- Find median in a stream
- Solve the Sudoku
- Merge Without Extra Space
- Longest Prefix Suffix
- Print all LCS sequences
- Edit Distance
- Palindromic Partitioning
- Stock Buy and Sell – Max K Transactions Allowed
- Matrix Chain Multiplication
- Word Break - 2
- N-Queen Problem
- Phone directory
- Travelling Salesman Problem
- Let's Play!!!
- Huffman Encoding
- Sort Matrix Rows
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Pairwise swap elements of a linked list
- Node at a given index in linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Inorder Traversal
- Reverse a Doubly Linked List
- 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
- Check If Circular Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Transform to Sum Tree
- 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
- 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
- Postorder from Inorder and Preorder
- Lowest Common Ancestor in a BST
- Binary Search
- Run Length Encoding
- Largest subarray of 0's and 1's
- Minimum Depth of a Binary Tree
- Remove duplicates in array
- Odd even level difference
- Binary Tree to BST
- Equilibrium index of an array
- Unique rows in boolean matrix
- Leaves at Same Level or Not
- Match specific pattern
- Multiply two linked lists
- Josephus problem
- Expression Tree
- Delete in a Singly Linked List
- Kth largest element in BST
- Array Duplicates
- Max Level Sum in Binary Tree
- Three way partitioning
- String Modification
- Level order traversal
- Index of an Extra Element
- Convert Ternary Expression to Binary Tree
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Level of a Node in Binary Tree
- Reverse Using Stack
- XOR of a given range
- Symmetric Tree
- Delete Alternate Nodes
- Count Pairs whose sum is equal to X
- Maximum Node Level
- Find length of Loop
- Maximum Pairwise Computed Value
- Queue Reversal
- Reverse first K of a Queue
- Remove Half Nodes
- Sum of Leaf Nodes
- Sum of Left Leaf Nodes
- Nodes at Odd Levels
- Brothers From Different Roots
- Move all zeros to the front of the linked list
- Delete Mid of a Stack
- Rotate doubly Linked List
- The New Line
- Controlled_Printing
- Data Types
- Learn to Comment
- Learning to be precise
- For Loop- primeCheck
- While loop- printTable
- Learning Macros
- Swap the array elements
- Matrix Interchange
- Predict the Column
- Swap values using References
- Two Dimensional World
- Delete Array
- Cover the distance
- BigInteger Multiply
- Pair Sum in Vector
- Frequency in Queue
- Operations on PriorityQueue
- Min Heap implementation
- Multimap Operations
- Power of 2
- Wave Array
- Frequencies in a Limited Array
- Array Leaders
- Rotate by 90 degree
- Linear Probing in Hashing
- Winner of an election
- Isomorphic Strings
- Reverse Words
- Non Repeating Character
- Parenthesis Checker
- Minimum indexed character
- K largest elements
- Minimum Cost of ropes
- N meetings in one room
- Largest number with given sum
- Reach a given score
- Count ways to N'th Stair
- Count number of hops
- First Repeating Element
- Union of Arrays with Duplicates
- Check Equal Arrays
- Positive Negative Pair
- Two Sum
- Missing in Array
- First Non Repeating Character
- Product array puzzle
- Roman Number to Integer
- Super Balanced Network
- Exhausted Giant
- Harry-The Clever Boy
- Repeated Pattern Length
- Parcel Distribution
- Longest strictly increasing path in a binary tree
- Password Decryption
- Math Query
- Counting Letters
- Path in a golf course
- Exploding Cars
- Pizza Love
- Algorithm Experts and Software Developers
- Most efficient way to reach end of array
- Intersection of Arrays with Distinct
- Lexicographical smallest sub-sequence of k length in a string
- Find the rankings
- Count number of nodes of a Complete Binary Tree
- Trapping Rain Water
- Left View of Binary Tree
- Count ways to reach the n'th stair
- Trie | (Insert and Search)
- Number of Rotations
- Unique Words from Two Sentences
- Sum of M elements after Kth smallest element in BST
- Missing And Repeating
- Buildings receiving sunlight
- Non-Repeating Element
- Pairs of equals Sum
- Max value
- Find Kth Rotation
- Minimum Energy
- Pairs with certain difference
- Common in 3 Sorted Arrays
- Sorted and Rotated Minimum
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- String Duplicates Removal
- Chocolate Distribution Problem
- Maximum Sum Bitonic Subsequence
- Bitonic Point
- Find Duplicate Element
- Smallest subarray with sum greater than x
- Closest Strings
- Single Number
- Remove Consecutive Characters
- Common Subsequence
- Remove b and ac from a given string
- Addition of submatrix
- Remove Duplicates
- Sum of two numbers represented as arrays
- Facing the sun
- Count Substrings
- Twice Counter
- Word with maximum frequency
- 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
- Find missing in second array
- String's Count
- Min Number of Flips
- Two sum -Pairs with 0 Sum
- Segregate 0s and 1s
- Merging two unsorted arrays in sorted order
- Count the Zeros
- Merge two binary Max heaps
- Sum of Lengths of Non-Overlapping SubArrays
- Four Elements
- Palindrome String
- Shop in Candy Store
- Minimum Operations
- Number of 1 Bits
- Copy Set Bits in Range
- Palindrome
- Maximum Sum Problem
- Shortest path from 1 to n
- Reach the Nth point
- Maximize Toys
- Raju and coins
- Page Faults in LRU
- Letter Writer
- Increasing Sub Sequence
- Sum of average of all subsets
- Arithmetic Number
- Rotate a Matrix by 180 Counterclockwise
- Row with Minimum 1s
- LCS of '0' K Repeated String
- Help the Old Man!!!
- Print Pattern
- Array to BST
- Print Diagonally
- Even and Odd
- Virus Infection
- Rotate Array
- Count Linked List Nodes
- Size of Binary Tree
- Count Leaves in Binary Tree
- Postorder Traversal
- Queue using Linked List
- Queue Using Array
- Preorder Traversal
- First Occurence
- Sum Except First and Last
- Palindromic Array
- Multiply Matrices
- Peak element
- Minimum element in BST
- Sum of Binary Tree
- Insert in Middle of Linked List
- Start Coding
- The Size of
- Logical Operators
- Count Odd and Even
- Filter the weeds
- Volume of Cuboid
- Bit Difference
- Print 1 To N Without Loop
- Binary Array Sorting
- Check if a string is Isogram or not
- Sum of numbers in string
- Reverse a String
- Binary Array Sorting
- Sum of Array
- Print Elements of Array
- Balanced Array
- Value equal to index value
- Check for subsequence
- Fighting the darkness
- String Reversal
- Rotate Array by One
- Array Subset
- Rotating an Array
- Minimum number to form the sum even
- Print first letter of every word in the string
- Find position of set bit
- Median of an Array
- Finger Game
- Count Squares
- Middle of Three
- Unique Numbers
- Finding Position
- Sorted matrix
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