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SCHOOL (2)
BASIC (62)
EASY (247)
MEDIUM (238)
HARD (17)
- Geek and his Marks
- Reach the target
- Geek-onacci Number
- Geek and Pens
- Power of 3
- Flip the Matrix
- Geek and Contest ||
- K Subarray Sum
- Reverse a linked list
- Frequency in a Linked List
- Pairwise swap elements of a linked list
- Node at a given index in linked list
- Linked list of strings forms a palindrome
- Compare two linked lists
- Delete nodes having greater value on right
- Split a Linked List into two halves
- Inorder Traversal
- Reverse a Doubly Linked List
- Insertion Sort
- Mirror 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
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Level Order in spiral form
- DFS of Graph
- Stack using Linked List
- BFS of graph
- Identical Trees
- Binary Search
- Largest subarray of 0's and 1's
- Remove Duplicates Sorted Array
- Odd even level difference
- Binary Tree to BST
- Unique rows in boolean matrix
- Third largest element
- Convert to Roman No
- Match specific pattern
- Josephus problem
- Expression Tree
- Max distance between same elements
- Count Occurrence of digit k
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Multiply two polynomials II
- Special Stack
- Index of an Extra Element
- Play with an array
- Reverse Using Stack
- 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 n/k th node in Linked list
- Linked List Matrix
- Queue Reversal
- Reverse first K of a Queue
- Sum of Leaf Nodes
- Tilt of Binary Tree
- Delete Mid of a Stack
- Rotate doubly Linked List
- Product of an Array
- Java Collections | Set 7 (LinkedList)
- Start Coding - Java
- The New Line - Java
- Data Types - Java
- Learn to Comment - Java
- Swap the array elements
- Matrix Interchange
- Predict the Column
- Matrix Interchange - Java
- Xoring and Clearing - Java
- Pair in Java
- Maximum Area Rectangle
- Sum of Big Integers
- Java ArrayList Operation
- Reverse an Array
- Stack Operations
- Frequency in Queue
- Get min at pop
- Deque Implementations
- Frequency Game
- Pair Sum Existence
- Pair Sum Existence- Revisited
- Dictionary Usage - Java
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- Longest Consecutive 1's
- Power of 2
- Swap odd and even bits
- Equilibrium Point
- Array Leaders
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Anagram
- Winner of an election
- String Rotated by 2 Places
- Reverse Words
- Minimum indexed character
- Panagram Checking
- Non Repeating Character
- Parenthesis Checker
- Minimum indexed character
- Generate Binary Numbers
- K largest elements
- N meetings in one room
- Largest number with given sum
- Count number of hops
- Unique Substrings
- Union of Arrays with Duplicates
- Common Elements
- Check Equal Arrays
- Positive Negative Pair
- Missing in Array
- Roman Number to Integer
- Search an element in sorted and rotated array
- Excel Sheet | Part - 2
- Missing And Repeating
- Sort by Set Bit Count
- Adding Ones
- Good Pairs
- First Come First Serve
- Maximum no of 1's row
- Sum of elements between k1'th and k2'th smallest elements
- Min sum formed by digits
- Min Subsets with Consecutive Numbers
- Minimize the sum of product
- Move all negative elements to end
- Find Pair Given Difference
- Largest Permutation
- Permutations in array
- Swap and Maximize
- Fascinating Number
- Bitonic Point
- Find Duplicate Element
- Sort Array II
- Alternate Positive Negative
- Check if actual binary representation of a number is palindrome
- Closing bracket index
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Check if the number is balanced
- Rearrange a string
- Ordering of strings
- Remove Duplicates
- Twice Counter
- Convert array into Zig-Zag fashion
- Find all pairs with a given sum
- Number of occurrence
- The Even Array
- Reversing the equation
- Convert an array to reduced form
- Longest Common Prefix of Strings
- First Repeated Character
- Counts Zeros Xor Pairs
- Two sum -Pairs with 0 Sum
- Segregate 0s and 1s
- Large number division
- Print an array in Pendulum Arrangement
- Inverse Permutation
- Play With OR
- At Least K Occurrences
- Maximum sum of increasing order elements from n arrays
- Count the Zeros
- Length of longest subarray
- Merge two binary Max heaps
- Maximum average subarray
- Total count
- Print Bracket Number
- Balanced string
- Minimum changes to make all substrings distinct
- Is Binary Number Multiple of 3
- Kth LSB
- Karatsuba Algorithm
- Number of 1 Bits
- Find the Highest number
- Check if a Integer is power of 8 or not
- Change Bits
- Copy Set Bits in Range
- Amicable Pair
- Assign Mice Holes
- Find maximum number
- Right most non zero digit
- Break a number
- Perfect Numbers
- Smallest number with sum of digits as N and divisible by 10^N
- Maximize Toys
- Raju and coins
- Largest number possible
- Nikit's Problem
- Print this pattern!
- Penalty Shooters
- Squares in N*N Chessboard
- Print all bitwise subsets of a number N
- Find smallest values of x and y
- Form a number divisible by 3 using array digits
- Number of subsets and mean
- Triangular Number
- Sum of First N Natural Numbers
- Recursive sequence
- Tom and Jerry
- Maximum Diamonds
- Multiply two polynomials
- Choose and Swap
- Print Pattern
- Rearrange Geek and his Classmates
- Gadgets of Doraland
- Reverse Bits
- Sum of two numbers without using arithmetic operators
- Largest value in each level
- Smallest window containing 0, 1 and 2
- Can Make Triangle
- Matrix Operations
- 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
- Type it!
- Min operations
- Last cell in a Matrix
- Seating Arrangement
- Ticket Counter
- Level of Node in Tree
- Unique Number of Occurrences
- Sorting Items
- Balloon Everywhere
- Bridge on Bits
- Even Sum
- Minimise the Expression
- Is it a Leap Year
- Bob's Impression
- Counting N-Digit Numbers with a 7
- Odd Minus Prime
- Get Segments
- Reach Alice
- Bob's Game
- Varient Operations
- Nearly Sorted Algorithm
- 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
- Rearrange linked list in-place
- Quick Sort on 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
- Diameter of a Binary Tree
- Heap Sort
- Flattening a Linked List
- Diagonal Tree Traversal
- Stack using Queue
- Tree Boundary Traversal
- Implement stack using array
- Delete a node from BST
- Directed Graph Cycle
- Undirected Graph Cycle
- Absolute List Sorting
- Lowest Common Ancestor in a BST
- Two Stacks in an Array
- The Celebrity Problem
- Largest subarray with 0 sum
- Topological Sort
- Merge K sorted linked lists
- Find the number of islands
- Generate IP Addresses
- Kth smallest element in a Matrix
- Remove loop in Linked List
- Dijkstra Algorithm
- Minimum Spanning Tree
- Largest BST
- Minimum Swaps to Sort
- Implement Atoi
- Maximum Difference
- Palindrome Linked List
- Strongly Connected
- Rat in a Maze
- Bipartite Graph
- Count distinct elements in every window
- Merge k Sorted Arrays
- Find triplets with zero sum
- Sort a stack
- Top View of Binary Tree
- Polynomial Addition
- Merge Sort for Linked List
- Union of Two Linked Lists
- Complete Binary Tree
- Counting elements in two arrays
- Foldable Binary Tree
- Predecessor and Successor
- Leaves to DLL
- Children Sum in a Binary Tree
- Deletion in Circular Linked List
- Median of BST
- Count set bits
- Tower Of Hanoi
- Reverse array in groups
- Power Of Numbers
- Wave Array
- Rearrange Array Alternately
- Rearrange an array with O(1) extra space
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Indexes of Subarray Sum
- Number of pairs
- Make Matrix Beautiful
- Spirally traversing a matrix
- Search in a sorted Matrix
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Case-specific Sorting of Strings
- Postfix Evaluation
- Stock span problem
- Next Greater Element
- Infix to Postfix
- K Sized Subarray Maximum
- Activity Selection
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- M-Coloring Problem
- Minimum Jumps
- Optimal Strategy For A Game
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Lucky Numbers
- Number of Unique Paths
- Sort according to an Array
- Preorder to BST
- Zero Sum Subarrays
- Find whether path exist
- Kth Smallest
- Rotten Oranges
- Container With Most Water
- Rotate by 90 degree
- Word Break
- Word Search
- Prerequisite Tasks
- 4 Sum - All Quadruples
- Excel Sheet | Part - 1
- Sort 0s, 1s and 2s
- Complement
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Search in Rotated Sorted Array
- Form the Largest Number
- Max value after m range operation
- Swapping pairs make sum equal
- Form a palindrome
- Next Smaller Element
- Sum of two large numbers
- Max Sum without Adjacents
- Remove leading zeros from an IP address
- k largest elements
- Longest Common Substring
- Longest substring with distinct characters
- Longest Palindrome in a String
- K-th element of two Arrays
- Arranging the array
- Rod Cutting
- Minimum swaps and K together
- Minimize the Heights II
- First and Last Occurrences
- Valid Substring
- Permutations of a String
- Find largest word in dictionary
- Unique Number II
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Sequence of Sequence
- Coin Change (Minimum Coins)
- Perfect Sum Problem
- Smallest number
- Power Set
- Knapsack with Duplicate Items
- Maximum path sum in matrix
- Partition Equal Subset Sum
- XOR Game
- Longest Bitonic subsequence
- Lucky alive person in a circle
- Handshakes
- Array Pair Sum Divisibility Problem
- Matchsticks game
- Subset Sums
- N Digit numbers with digits in increasing order
- Akku and Binary Numbers
- Last non-zero digit in factorial
- Number of paths
- Permutation with Spaces
- Card Rotation
- Choose and Swap
- Return two prime numbers
- Find nth root of m
- Find Prime numbers in a range
- Find the Safe Position
- Next Permutation
- Missing number in matrix
- Smaller on Left
- Rotate matrix elements clockwise
- Decode the string
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- 7 Segment Display
- Replace O's with X's
- Floyd Warshall
- Flood fill Algorithm
- Array to BST
- Height Using Parent Array
- Recursively Remove Adjacent Duplicates
- Coins of Geekland
- Iterative Postorder
- Subset Sum Problem
- Bellman-Ford
- Capacity To Ship Packages Within D Days
- Rearrange characters
- Number of Provinces
- Prefix match with other strings
- Find rectangle with corners as 1
- Cousins of a given node
- Sort for Singly Linked List
- Can Make Triangle
- Maximum of all subarrays of size k
- Overlapping Intervals
- Maximum number of events that can be attended
- Robots
- Hit most Balloons
- Concatenate Equal to Target
- Exactly one swap
- Maximum Winning score
- Compute Before Matrix
- Wine Buying and Selling
- Minimize connections
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Minimum Multiplications to reach End
- Safe States
- Number Of Islands
- Path With Minimum Effort
- Shortest Path in Undirected Graph
- Maximum Stone Removal
- Shortest path in Directed Acyclic Graph
- Asteroid Collision
- Geek's Training
- Aggressive Cows
- Maximum Sum Combination
- Print Longest Increasing Subsequence
- Partitions with Given Difference
- Absolute difference divisible by K
- Make array elements unique
- Find the first node of loop in linked list
- Carpet into Box
- Geeks And The String
- Minimum repeat to make substring
- Max Sum without Adjacents
- Intersection Point in Y Shaped Linked Lists
- BST Downward Traversal
- Unique Paths in a Grid
- Good Subtrees
- Find Kth permutation
- Count Subarrays
- Find the longest string
- Score of Array
- Shortest Subarray with Sum K
- Traffic Lights
- Beautiful Subarrays
- Sum Equals Length
- LRU Cache
- Alien Dictionary
- Trapping Rain Water
- Max of min for every window size
- Median of 2 Sorted Arrays of Different Sizes
- Merge Without Extra Space
- Count Pairs in an Array
- Edit Distance
- Minimum sum partition
- Palindromic Partitioning
- Matrix Chain Multiplication
- Median in a row-wise sorted Matrix
- Boolean Parenthesization
- N-Queen Problem
- Min Chars to Add for Palindrome
- Account Merge
- Meeting Alice
- Rotate Array
- Sort String
- Weight of strings
- Print Linked List
- Find Length of Linked List
- Queue using Linked List
- Queue Using Array
- Replace all 0's with 5
- Replace all 0's with 5
- Preorder Traversal
- Linked List Insertion At End
- Anagram of String
- Is Linked List Length Even?
- Identical Linked Lists
- Modular Node
- Insert in Middle of Linked List
- Pairwise Consecutive Elements
- Count Odd and Even
- Stack designer
- Bit Difference
- Array Search
- Sorted Array Search
- Binary String
- Reverse a String
- Binary Array Sorting
- Multiply Array
- Doubling the value
- Balanced Array
- Fighting the darkness
- Uncommon characters
- Smaller and Larger
- Remove repeated digits in a given number
- Repeated Character
- First 1 in a Sorted Binary Array
- Elements in the Range
- Display longest name
- Largest Element in Array
- Rotate Array by One
- Game with nos
- Ishaan Loves Chocolates
- Array Subset
- Minimum number to form the sum even
- Min and Max in Array
- Multiply left and right array sum
- Average Count Array
- Red OR Green
- Find unique element
- Binary representation
- Find position of set bit
- Find the fine
- Median of an Array
- Find N-th term in the series
- Binary number to decimal number
- Sum of elements in a matrix
- Remainder Evaluation
- Matching Pair
- Middle of Three
- Unique Numbers
- Half N by M
- Sum of product of x and y with floor(n/x) = y
- Finding Position
- Maximize Expression