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BASIC (19)
EASY (213)
MEDIUM (448)
HARD (83)
- Find Length of Linked List
- Sum Except First and Last
- Anagram of String
- Sort and Reverse Vector
- Reverse a String
- First n Fibonacci
- Value equal to index value
- Repeated Character
- Elements in the Range
- Last index of One
- Rotate Array by One
- Game with nos
- One odd Occuring
- Ishaan Loves Chocolates
- Array Subset
- Min and Max in Array
- Count Squares
- Sorted matrix
- Max Min
- Reverse alternate nodes in Link 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
- Insert in Sorted Circular Linked List
- Count BST nodes that lie in a given range
- Check for BST
- Quick Sort
- Bottom View of Binary Tree
- 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
- Tree Boundary Traversal
- LCA in Binary Tree
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Two Stacks in an Array
- Topological Sort
- Merge K sorted linked lists
- Find the number of islands
- Find kth element of spiral matrix
- Generate IP Addresses
- Remove loop in Linked List
- Largest BST
- Count Palindromic Subsequences
- Multiply two strings
- Implement Atoi
- Bipartite Graph
- Closest in BST
- BST with Dead End
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Find Common Nodes in two BSTs
- Level order traversal
- Peak element
- Polynomial Addition
- Delete nodes greater than k
- Merge Sort for Linked List
- Union of Two Linked Lists
- Euler circuit and Path
- Binary Tree to CDLL
- Complete Binary Tree
- Counting elements in two arrays
- 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
- Predecessor and Successor
- Children Sum in a Binary Tree
- Find length of Loop
- Deletion in Circular Linked List
- Median of BST
- Normal BST to Balanced BST
- Sum of nodes on the longest path
- Kth Ancestor in a Tree
- ZigZag Tree Traversal
- Swap Kth nodes from ends
- Maximum Non-Adjacent Nodes Sum
- Mother Vertex
- Ceil in BST
- Reverse array in groups
- Power Of Numbers
- Wave Array
- Rotate and delete
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Maximum Index
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Indexes of Subarray Sum
- Triplet Sum in Array
- Merge Without Extra Space
- Level of Nodes
- Make Matrix Beautiful
- Boolean Matrix
- Spirally traversing a matrix
- Determinant of a Matrix
- Distance of nearest cell having 1
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Strings Rotations of Each Other
- Case-specific Sorting of Strings
- K Sized Subarray Maximum
- Minimum Cost of ropes
- Nearly sorted
- Fractional Knapsack
- Minimum Platforms
- Black and White
- Unique Subsets
- M-Coloring Problem
- Minimum Jumps
- Detect Cycle using DSU
- Stickler Thief
- Egg Dropping Puzzle
- Longest Increasing Subsequence
- Longest Common Subsequence
- Lucky Numbers
- Preorder to BST
- X Total Shapes
- Zero Sum Subarrays
- Find whether path exist
- Kth Smallest
- Implement Trie
- Shortest Common Supersequence
- Nth Catalan Number
- Count subsequences of type a^i, b^j, c^k
- Container With Most Water
- Top K Frequent in Array
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- 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
- Top k numbers in a stream
- Equivalent Sub-Arrays
- Consecutive 1's not allowed
- Pythagorean Triplet
- Painting the Fence
- Smallest number with at least n trailing zeroes in factorial
- Count pairs Sum in matrices
- Sum of bit differences
- Count Full Binary Trees
- Maximize The Array
- Form the Largest Number
- Add Binary Strings
- Super Primes
- Maximum Product Subarray
- Longest subarray with sum divisible by K
- Check if a string is repetition of its substring of k-length
- Row with max 1s
- Column name from a given column number
- Substrings with K Distinct
- Form a palindrome
- Next Smaller Element
- Transform String
- Count the Reversals
- Number of positive integral solutions
- Cutting Binary String
- Factorials of large numbers
- Shuffle integers
- Remove leading zeros from an IP address
- k largest elements
- Sum of XOR of all pairs
- Magnet Array Problem
- Smallest distinct window
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Look and Say Pattern
- 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
- Smallest Absolute Difference
- LCS of three strings
- Longest Palindromic Subsequence
- Build the smallest
- Minimize the Heights II
- Transform to prime
- First and Last Occurrences
- Reaching the heights
- Smaller on Left
- Minimum Deletions
- A difference of values and indexes
- Nine Divisors
- Minimum Swaps for Bracket Balancing
- Permutations of a String
- Number following a pattern
- Friends Pairing Problem
- CamelCase Pattern Matching
- Lexicographically smallest string
- Subarrays Product Less than K
- Unique Number II
- Bleak Numbers
- Largest prime factor
- 3 Divisors
- Modified Game of Nim
- Max Sum Increasing Subsequence
- Minimum cost to fill given weight in a bag
- Coin Change (Count Ways)
- Sequence of Sequence
- Santa Banta
- Gold Mine Problem
- Perfect Sum Problem
- Firing employees
- Shreyansh and his bits
- Power Set
- Knapsack with Duplicate Items
- nCr
- Number of ways
- Subsets with XOR value
- Partition Equal Subset Sum
- XOR Game
- Longest Bitonic subsequence
- Count possible ways to construct buildings
- Count digit groupings of a number
- Probability of Knight
- Array Pair Sum Divisibility Problem
- Magic Triplets
- Brain Game
- Fill up buckets
- Matchsticks game
- Killing Spree
- Unique partitions
- Fill the Tank
- Akku and Binary Numbers
- Number of paths
- Knight Walk
- Stepping Numbers
- Permutation with Spaces
- Choose and Swap
- LCM Triplet
- Return two prime numbers
- Fact Digit Sum
- A Game of LCM
- Party in Town
- Game with String
- Count even length
- Find the Safe Position
- Smith Number
- Next Permutation
- Missing number in matrix
- 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
- Total Decoding Messages
- Stream First Non-repeating
- 2D Hopscotch
- Villain Con
- Segregate even and odd nodes in a Linked List
- Tricky Subset Problem
- Longest Perfect Piece
- Rat Maze With Multiple Jumps
- Geek and Strings
- Pairs of Non Coinciding Points
- The Smurfs
- 7 Segment Display
- Product of Primes
- Eulerian Path in an Undirected Graph
- Transitive closure of a Graph
- Replace O's with X's
- nCr mod M | Part 2
- Two odd Occuring
- Find all distinct subset (or subsequence) sums
- Check Mirror in N-ary tree
- Queries on Strings
- Special Matrix
- Queries on a Matrix
- Broken blocks
- Express as sum of power of natural numbers
- Traverse All Edges And Vertices
- Find the string in grid
- Shortest Uncommon Subsequence
- Nodes at even distance
- Biconnected Graph
- Help a Thief!!!
- Count the paths
- Floyd Warshall
- Array to BST
- Form coils in a matrix
- Techfest and the Queue
- Shortest Source to Destination Path
- Shortest Path between Cities
- Height Using Parent Array
- Reverse Spiral Form of Matrix
- Geek and Number String
- Save Your Life
- Hamiltonian Path
- Recursively Remove Adjacent Duplicates
- Spidey Sense
- Escape the Forbidden Forest
- Jump Game
- Form a palindrome
- Coin Piles
- Remove K Digits
- 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
- Find duplicate rows in a binary matrix
- Single valued subtree
- BST to max heap
- BST to greater sum tree
- Find rectangle with corners as 1
- Paths from root with a specified sum
- Shortest Prime Path
- Sort for Singly Linked List
- Subsets
- Flatten binary tree to linked list
- Rank The Permutations
- Anti Diagonal Traversal of Matrix
- IPL 2021 - Match Day 2
- Unique Number III
- All Unique Permutations of an array
- Course Schedule II
- Find and Replace in String
- Clone an Undirected Graph
- Minimum times A has to be repeated such that B is a substring of it
- Bitwise AND of the Array
- Overlapping Intervals
- Remove and Reverse
- Maximum number of events that can be attended
- Longest Possible Route in a Matrix with Hurdles
- Find k-th smallest element in given n ranges
- Even Swap
- Reverse a Stack
- Farthest number
- Robots
- Hit most Balloons
- Maximum Meetings in One Room
- Enemy
- Max Equal sum of 3 Stacks
- Buy Maximum Stocks
- Concatenate Equal to Target
- Exactly one swap
- Maximum Winning score
- Compute Before Matrix
- Smallest sum contiguous subarray
- Array Removals
- Minimum Cost to cut a board into squares
- Validate Stack Operations
- Largest subtree sum in a tree
- Wine Buying and Selling
- Graph is Tree or Not
- Replace every element with the least greater element on its right
- Maximum selections
- Next element with greater frequency
- Sum of nodes within k distance from target
- Minimum increment/decrement to make array non-Increasing
- Minimum Swaps
- Construct Binary Tree from String with bracket representation
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Number Of Enclaves
- Safe States
- Alex Travelling
- Number Of Islands
- Merging Details
- Number of Ways to Arrive at Destination
- Shortest path in Directed Acyclic Graph
- Asteroid Collision
- Aggressive Cows
- Task Scheduler
- Hands of Straights
- Maximum Sum Combination
- Partitions with Given Difference
- Floor in BST
- GCD Array
- Minimize number of Students to be removed
- Maximum Value
- Shortest Prime Path
- Flattening a Linked List
- Absolute difference divisible by K
- Make array elements unique
- Next Greater Element in Circular Array
- Find the first node of loop in linked list
- Carpet into Box
- Minimum X (xor) A
- Find minimum number of Laptops required
- Geeks And The String
- Find the longest string
- Maximum Profit By Choosing A Subset Of Intervals
- Minimum repeat to make substring
- Paint N Houses
- Max Sum without Adjacents
- Intersection Point in Y Shaped Linked Lists
- BST Downward Traversal
- Length of the longest subarray with positive product
- Count number of free cell
- Maximum Bipartite Matching
- Minimum Days
- Prime List
- Walls Coloring
- Water the plants
- Geeks Island
- Apple Sequences
- Connect Nodes at Same Level
- Unique Paths in a Grid
- Valid Compressed String
- Fill the Matrix
- Optimal Array
- Good Stones
- Maximum Intersecting Lines
- String rp or pr
- Knight in Geekland
- Shy Geek
- Count Special Numbers
- Minimum Steps Required
- Count Cyclic Paths
- Maximum Triplet product
- Second smallest number
- Special Palindrome Substrings
- Maximum Possible Value
- Distinct Difference
- Anagrams in Linked List
- Yet another query problem
- Geek hates too many 1s
- Remove the balls
- Unequal Arrays
- Job Sequencing Problem
- Bheem Wants Ladoos
- Prefix Suffix String
- Shortest XY distance in Grid
- BST Maximum Difference
- Nearest smaller tower
- Another Coin Change Problem
- Geek's Village and Wells
- Find Number
- Powerful Integer
- Good Subtrees
- Subtree In N-ary Tree
- Easy Task
- Add Minimum Characters
- Maximum subset sum
- Palindrome with minimum sum
- Count Total Setbits
- Tree Transformation
- Construct a Full Binary Tree
- Modify Linked List-1
- Find Kth permutation
- Fraction pairs with sum 1
- New Year Resolution
- Grinding Geek
- 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
- Split a Linked List into two halves
- Reverse a Doubly Linked List
- Right View of Binary Tree
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Decimal Equivalent of Binary Linked List
- Transform to Sum Tree
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Level Order in spiral form
- Reverse Level Order Traversal
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Binary Tree to BST
- Unique rows in boolean matrix
- Leaves at Same Level or Not
- Josephus problem
- You and your books
- 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
- Insert in a Sorted List
- Sum of leaf nodes in BST
- More than n/k Occurrences
- Reverse Using Stack
- Symmetric Tree
- Next Right Node
- Leaf under budget
- Queue Reversal
- Reverse first K of a Queue
- Find Sum Pairs Across Two BSTs
- Move all zeros to the front of the linked list
- Delete Mid of a Stack
- Rotate doubly Linked List
- Bitwise Operators - Java
- Learning Structs
- Delete Array
- Sum of Big Integers
- BigInteger Multiply
- Frequency in Queue
- Frequency Game
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- Power of 2
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Minimum Number in a sorted rotated array
- Print adjacency list
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Transpose of Matrix
- Matrix Boundary Traversal
- Winner of an election
- Isomorphic Strings
- Reverse Words
- Panagram Checking
- Non Repeating Character
- Parenthesis Checker
- Largest number with given sum
- Union-Find
- Count number of hops
- Union of Arrays with Duplicates
- Missing in Array
- Product array puzzle
- Roman Number to Integer
- Missing And Repeating
- Adding Ones
- Common in 3 Sorted Arrays
- Sum of elements between k1'th and k2'th smallest elements
- Search in a Row-Column sorted matrix
- Move All Zeroes to End
- Min sum formed by digits
- Move all negative elements to end
- Chocolate Distribution Problem
- Count the triplets
- Find Pair Given Difference
- Smallest subarray with sum greater than x
- Alternate Positive Negative
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Convert array into Zig-Zag fashion
- Rotate Bits
- Number of occurrence
- Reversing the equation
- Convert an array to reduced form
- String's Count
- Min Number of Flips
- Counts Zeros Xor Pairs
- Two sum -Pairs with 0 Sum
- Play With OR
- Hungry Pizza Lovers
- At Least K Occurrences
- Find the closest pair from two arrays
- Palindrome String
- Maximum average subarray
- Search array with adjacent diff at most k
- Smallest greater elements in whole array
- Fitting The Array
- Balanced string
- Shop in Candy Store
- Partition a number into two divisible parts
- Is Binary Number Multiple of 3
- Minimum Operations
- Divisibility by 8
- Number of 1 Bits
- Max Sum Subarray of size K
- Nth Fibonacci Number
- Change Bits
- Copy Set Bits in Range
- Sum 1 to n Divisors
- The Bit Game
- Swap bits
- Minimum number of Coins
- Break a number
- Perfect Numbers
- Nth item through sum
- Smallest number with sum of digits as N and divisible by 10^N
- Largest number possible
- Recamans sequence
- Form a number divisible by 3 using array digits
- Least Prime Factor
- Sum of First N Natural Numbers
- Recursive sequence
- Tom and Jerry
- Maximum Diamonds
- Arithmetic Number
- Surround the 1's
- Help Ishaan
- Trace Path
- Inorder Traversal and BST
- Sequence Fun
- Letters Collection
- Help the Old Man!!!
- Print Pattern
- Print the pattern
- 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
- Rearrange Geek and his Classmates
- Modified Numbers and Queries
- Fraction Trouble
- Print Diagonally
- Sum of two numbers without using arithmetic operators
- Even and Odd
- Search insert position of K in a sorted array
- Largest value in each level
- Maximum number of 2X2 squares
- License Key Formatting
- Count the Substrings
- Find all possible paths from top to bottom
- Split the binary string into substrings with equal number of 0s and 1s
- Minimum Sum of Absolute Differences of Pairs
- Smallest window containing 0, 1 and 2
- Move Last Element to Front of a Linked List
- Can Make Triangle
- Matrix Operations
- Find pairs with given sum in doubly linked list
- Triangle and Square
- Maximum Depth Of Binary Tree
- Bus Ticket Change
- Minimize the sum
- Last modified ball
- Transform to Sum Tree
- Parent of Max GCD Siblings in a Binary Tree
- Maximum Weight Node
- Type it!
- Min operations
- Last cell in a Matrix
- Balloon Everywhere
- 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
- Is it Fibonacci
- Taxi Booking
- Max Level Sum in Binary Tree
- Binary matrix having maximum number of 1s
- Number of Subarrays of 0's
- Maximum Identical Bowls
- Bus Conductor
- Wifi Range
- Minimum Number
- Minimum Integer
- Seating Arrangement
- String Mirror
- Make Palindrome
- Binary Modulo
- Total Cuts
- Bit Magic
- Array Operations
- Total Traversal Time
- Ticket Counter
- Unique Number of Occurrences
- Linked List Group Reverse
- Reorder List
- Binary Tree to DLL
- Min distance between two given nodes of a Binary Tree
- Max rectangle
- Subtraction in Linked List
- Distinct occurrences
- AVL Tree Insertion
- Partition array to k subsets
- AVL Tree Deletion
- Nodes at given distance in binary tree
- Number of Turns in Binary Tree
- String Permutations
- Trapping Rain Water
- Solve the Sudoku
- Merge Without Extra Space
- Next Smallest Palindrome
- Search Pattern
- Count Smaller elements
- Number of distinct subsequences
- Wildcard string matching
- Number Formation
- Palindromic Partitioning
- Next Happy Number
- Median in a row-wise sorted Matrix
- Kill Captain America
- Boolean Parenthesization
- Bike Racing
- Word Break - 2
- Brackets in Matrix Chain Multiplication
- Phone directory
- Adventure in a Maze
- Closest Palindrome
- Optimal binary search tree
- Assignment Problem
- Longest Path in a matrix
- Word Wrap
- Maximum sum Rectangle
- Find the Maximum Flow
- Corona Vaccine
- Search Pattern (Rabin-Karp Algorithm)
- Minimum X (xor) A
- Find all Critical Connections in the Graph
- Sorted Linked List to BST
- 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
- Distribute Candies
- Split Array Largest Sum
- Find number of closed islands
- Scrambled String
- Shortest Path by Removing K walls
- Find the String
- Maximum Number of Toys
- Articulation Point - I
- Min Chars to Add for Palindrome
- Largest rectangular sub-matrix whose sum is 0
- Minimum time to fulfil all orders
- Geek in a Maze
- Vertex Cover
- Expression Add Operators
- MaxSkill
- Minimize Max Distance to Gas Station
- Candy
- Better String
- Count Lucky Permutations
- Count the Substring
- Select Nodes
- Largest Sum Cycle
- Fixing Two swapped nodes of a BST
- Shortest Path Using Atmost One Curved Edge
- Avoid Explosion
- Redundant Parenthesis
- Partition the Array
- Count Binary Strings With No Consecutive 1s
- Maximum Number of coins
- Median of the Subarrays
- Minimum BST Sum Subtree
- Cake Distribution Problem
- Min Time
- Game Of Subsets
- Geekina Hate 1s
- Making A Large Island