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BASIC (3)
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MEDIUM (137)
HARD (29)
- Detect Loop in linked list
- Quick Sort
- Two Stacks in an Array
- Topological sort
- Find kth element of spiral matrix
- Validate an IP Address
- Additive sequence
- Multiply two strings
- Print matrix in diagonal pattern
- Closest in BST
- Find triplets with zero sum
- Union of Two Linked Lists
- Euler Circuit in an Undirected Graph
- Linked List that is Sorted Alternatingly
- Predecessor and Successor
- Diagonal sum in binary tree
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Smallest Positive Missing
- Power Of Numbers
- Rearrange an array with O(1) extra space
- Merge Without Extra Space
- Subarrays with equal 1s and 0s
- Case-specific Sorting of Strings
- Postfix Evaluation
- Next Greater Element
- Stickler Thief
- Kth Smallest
- Word Break
- Stock Buy and Sell – Multiple Transaction Allowed
- Word Search
- Sort 0s, 1s and 2s
- Maximum Index
- Sum of bit differences
- Form the Largest Number
- Check if frequencies can be equal
- k largest elements
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Arranging the array
- Rod Cutting
- First and Last Occurrences
- Permutations of a String
- CamelCase Pattern Matching
- Subarrays Product Less than K
- Santa Banta
- Power Set
- nCr
- Fill up buckets
- Matchsticks game
- Game with String
- Count even length
- Smaller on Left
- Total Decoding Messages
- Express as sum of power of natural numbers
- Largest subsquare surrounded by X
- Restrictive Candy Crush
- Search Pattern (Rabin-Karp Algorithm)
- Prefix match with other strings
- Remove and Reverse
- Even Swap
- Reverse a Stack
- Max Equal sum of 3 Stacks
- City With the Smallest Number of Neighbors at a Threshold Distance
- Task Scheduler
- Lemonade Change
- 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
- Carpet into Box
- Minimum X (xor) A
- Find minimum number of Laptops required
- Geeks And The String
- Minimum Operations
- Tree Formation
- Colorful Numbers
- Find the longest string
- Maximum Profit By Choosing A Subset Of Intervals
- Minimum repeat to make substring
- Paint N House
- Max Sum without Adjacents
- Intersection Point in Y Shaped Linked Lists
- Subarrays with given bitwise and
- 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
- Geeks Island
- Apple Sequences
- Will Students Pass?
- Connect Nodes at Same Level
- Unique Paths in a Grid
- Valid Compressed String
- Fill the Matrix
- Number of Good Components
- Optimal Array
- Best Node
- Update Queries
- Good Stones
- Maximum Intersecting Lines
- String rp or pr
- Knight in Geekland
- Shy Geek
- Count Special Numbers
- Minimum Steps Required
- Spidey Sense
- Count Cyclic Paths
- Maximum Triplet product
- Second smallest number
- Special Palindrome Substrings
- Maximum Possible Value
- Distinct Difference
- Anagrams in Linked List
- Geek hates too many 1s
- Maximum Length
- Job Sequencing Problem
- Bheem Wants Ladoos
- Prefix Suffix String
- Smaller Sum
- Shortest XY distance in Grid
- BST Maximum Difference
- Good Subtrees
- Subtree In N-ary Tree
- Add Minimum Characters
- Help Big Pig
- Modify Linked List-1
- Find Kth permutation
- Split It Up
- String Constraints
- Reverse a linked list
- Delete without head pointer
- Kth from End of Linked List
- Middle of a Linked List
- Left View of Binary Tree
- Delete Middle of Linked List
- Remove Duplicates from a Sorted Linked List
- Binary Search
- Unique rows in boolean matrix
- Remove every k'th node
- Array Duplicates
- Level order traversal
- Count Pairs whose sum is equal to X
- Swap the array elements
- Predict the Column
- Frequency in Queue
- Frequency Game
- Transpose of Matrix
- Isomorphic Strings
- Reverse Words
- Reach a given score
- Missing in Array
- Roman Number to Integer
- Non-Repeating Element
- Adding Ones
- Common in 3 Sorted Arrays
- String Duplicates Removal
- Count pairs Sum in matrices
- Alternate Positive Negative
- Reorganize The Array
- Equal point in a string of brackets
- Reversing the equation
- Convert an array to reduced form
- Longest Common Prefix of Strings
- Two sum -Pairs with 0 Sum
- Play With OR
- At Least K Occurrences
- Search array with adjacent diff at most k
- Encrypt the string - 2
- Is Binary Number Multiple of 3
- Minimum Operations
- Divisibility by 8
- Number of 1 Bits
- Copy Set Bits in Range
- Maximum Sum Problem
- Perfect Numbers
- Least Prime Factor
- Sum of First N Natural Numbers
- Maximum Diamonds
- Arithmetic Number
- Count the Substrings
- Maximum Depth Of Binary Tree
- Minimize the sum
- Last modified ball
- Transform to Sum Tree
- Parent of Max GCD Siblings in a Binary Tree
- Find the first node of loop in linked list
- Maximum Weight Node
- Type it!
- Min operations
- All Numbers
- Prefix Subsequences
- Virus Infection
- Binary Good
- Split the String
- Last cell in a Matrix
- Balloon Everywhere
- Juggling
- Min Jump
- Range OR
- Reverse both parts
- Cutting Rectangles
- 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
- Nice Array
- Calculate The Work Done
- Taxi Booking
- Occurrences of 101
- Max Level Sum in Binary Tree
- Binary matrix having maximum number of 1s
- Number of Subarrays of 0's
- Wifi Range
- Minimum Integer
- String Mirror
- Powerfull Integer
- Dominant Pairs
- Total Traversal Time
- Antique Collections
- Binary Array
- Geekina and Log
- Minimum Thorns
- Ticket Counter
- Geek's Plants
- Weight Problem
- Organic Tree
- Maximum occurring digit
- Distinct occurrences
- Nodes at given distance in binary tree
- Longest repeating and non-overlapping substring
- Next Happy Number
- Generalised Fibonacci numbers
- Boolean Parenthesization
- Reverse a sublist of a linked list
- Scrambled String
- Maximum Number of Toys
- Stock Buy and Sell – Max 2 Transactions Allowed
- Expression Add Operators
- 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
- Walls Coloring II
- Partition the Array
- Divide in Incremental Groups
- Max min Height
- Maximum Number of coins
- Median of the Subarrays
- Minimum BST Sum Subtree
- Special Digits
- Cake Distribution Problem
- Min Time
- Yet Another String Problem
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