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BASIC (15)
EASY (168)
MEDIUM (213)
HARD (39)
Reverse a linked list
Frequency in a Linked List
Linked list of strings forms a palindrome
Delete nodes having greater value on right
Delete in a Doubly Linked List
Reverse a Doubly Linked List
Check for BST
K distance from root
Mirror Tree
Height of Binary Tree
Middle of a Linked List
Left View of Binary Tree
Delete Middle of Linked List
Decimal Equivalent of Binary Linked List
Remove Duplicates from a Sorted Linked List
Reverse Level Order Traversal
Implement stack using array
Insert a node in a BST
Root to leaf path sum
Square Root
Nodes without a Sibling
Remove Duplicates from an array
Binary Tree to BST
Unique rows in boolean matrix
Toeplitz matrix
Remove every k'th node
Leaves at Same Level or Not
Multiply two linked lists
You and your books
Max distance between same elements
Array Duplicates
Three way partitioning
Inorder Successor in BST
Index of an Extra Element
Split Linked List Alternatingly
Sum of leaf nodes in BST
Delete Alternate Nodes
Count Pairs whose sum is equal to X
Find length of Loop
Median of BST
Leaf under budget
Linked List Matrix
Queue Reversal
Remove Half Nodes
Closest Neighbour in BST
Delete Mid of a Stack
Swap the array elements
Xoring and Clearing
Reverse an Array
Decimal to binary
First Set Bit
Rightmost different bit
Power of 2
Equilibrium Point
Array Leaders
Roof Top
Print adjacency list
Transpose of Matrix
Anagram
Reverse Words
Panagram Checking
Non Repeating Character
Parenthesis Checker
Minimum Cost of ropes
N meetings in one room
Reach a given score
Count ways to N'th Stair
Count number of hops
Union of Arrays with Duplicates
Missing in Array
Product array puzzle
Max Value Permutation
Missing And Repeating
Count the elements
Find the closest number
Sorted and Rotated Minimum
Search in a Row-Column sorted matrix
Move All Zeroes to End
String Duplicates Removal
Chocolate Distribution Problem
Count the triplets
Find Pair Given Difference
Pairs with difference k
Swap and Maximize
Single Number
Alternate Positive Negative
Remaining String
Kth distance
Remove Duplicates
Nearest multiple of 10
Reorganize The Array
Facing the sun
Second Largest
Convert array into Zig-Zag fashion
Two Sum - Pair with Given Sum
Rotate Bits
Number of occurrence
K-Pangrams
Does array represent Heap
Modify the Array
Sum Pair closest to target
Find missing in second array
Longest Common Prefix of Strings
Segregate 0s and 1s
Play With OR
At Least K Occurrences
Find the closest pair from two arrays
Palindrome String
Total count
Pair with given sum in a sorted array
Print Bracket Number
Odd Even Problem
Binary representation of next number
Is Binary Number Multiple of 3
Extract the Number from the String
Divisibility by 8
Number of 1 Bits
Find the Highest number
Armstrong Numbers
Reverse Bits
Max Sum Subarray of size K
Nth Fibonacci Number
Copy Set Bits in Range
Count Digits
Maximum Sum Problem
Party of Couples
Perfect Numbers
Largest number possible
Recamans sequence
Sum of First N Natural Numbers
Recursive sequence
Juggler Sequence
Summed Matrix
Row with Minimum 1s
Surround the 1's
Coverage of all Zeros in a Binary Matrix
Array to BST
Insert an Element at the Bottom of a Stack
Fibonacci series up to Nth term
Stock Buy and Sell – Max one Transaction Allowed
Maximum Depth Of Binary Tree
Divisor Game
Ticket Counter
Weight Problem
Unique Number of Occurrences
Beautiful Number
Strong Students in School
Array Game
Silver and Gold
Even Sum
Two Smallests in Every Subarray
Split an array into two equal Sum subarrays
Largest Pair Sum
Geekland Tax Calculator
Perfect Meeting
Good Substrings
Minimize Cost
Validate distribution
Find Smallest
Geek String
Two Swaps
Smallest Substring
Meeting Rooms
Count Pairs whose sum is less than target
Find Minimum Cost
Union of Two Sorted Arrays with Distinct Elements
Intersection of Two arrays with Duplicate Elements
Search in a row-wise sorted matrix
Rotate a Linked List
Add Number Linked Lists
Add 1 to a Linked List Number
Quick Sort on Linked List
Insert in Sorted Circular Linked List
Quick Sort
Binary Tree from Inorder and Postorder
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Heap Sort
Sum Tree
Construct Binary Tree from Parent Array
Max sum path in two arrays
The Celebrity Problem
Find the number of islands
Find kth element of spiral matrix
Max sum in the configuration
Wildcard Pattern Matching
Linked List to Binary Tree
Validate an IP Address
Largest BST
Sorted subsequence of size 3
Multiply two strings
Implement Atoi
Maximum Difference
Palindrome Linked List
Rat in a Maze Problem - I
Merge two BST 's
Count distinct elements in every window
Root to leaf paths sum
Find triplets with zero sum
Level order traversal
Peak element
Union of Two Linked Lists
Euler Circuit in an Undirected Graph
Ancestors in Binary Tree
Root to Leaf Paths
Populate Inorder Successor for all nodes
XOR Linked List
Linked List that is Sorted Alternatingly
Leftmost and rightmost nodes of binary tree
Arrange Consonants and Vowels
Count the nodes at distance K from leaf
Vertical sum
Insert in Sorted way in a Sorted DLL
Isomorphic Trees
Children Sum in a Binary Tree
Diagonal sum in binary tree
Deletion and Reverse in Circular Linked List
Duplicate Subtrees
Sum of nodes on the longest path
ZigZag Tree Traversal
Vertical Width of a Binary Tree
Mother Vertex
Gray to Binary Conversion
Smallest Positive Missing
Power Of Numbers
Maximum occured integer
Rotate and delete
Rearrange an array with O(1) extra space
Maximum Index
Rotate Array
Kadane's Algorithm
Count Inversions
Two Repeated Elements
Union of 2 Sorted Arrays
Indexes of Subarray Sum
Count the number of possible triangles
Number of pairs
Merge Without Extra Space
Make Matrix Beautiful
Boolean Matrix
Spirally traversing a matrix
Search in a sorted Matrix
Rotate by 90 degree
Sort Elements by Decreasing Frequency
Strings Rotations of Each Other
K Sized Subarray Maximum
Nearly sorted
Fractional Knapsack
Job Sequencing Problem
Minimum Jumps
Optimal Strategy For A Game
Sum of all substrings of a number
Longest Common Subsequence
0 - 1 Knapsack Problem
Lucky Numbers
Allocate Minimum Pages
Kth Smallest
Implement Trie
Nth Catalan Number
Maximize The Cut Segments
Container With Most Water
Print Anagrams Together
Rotate by 90 degree
Closest Three Sum
Word Break
Stock Buy and Sell – Multiple Transaction Allowed
4 Sum - All Quadruples
Sort 0s, 1s and 2s
Paths to reach origin
Maximum Index
Sum of Middle elements of two sorted arrays
Split the Array
Search in Rotated Sorted Array
Sum of bit differences
Form the Largest Number
Add Binary Strings
Maximum Product Subarray
Row with max 1s
Swapping pairs make sum equal
Check if frequencies can be equal
Form a palindrome
Find the N-th character
Longest Common Substring
Longest substring with distinct characters
Longest Substring with K Uniques
K-th element of two Arrays
K closest elements
LCS of three strings
Minimum sum
Not a subset sum
Minimize the Heights II
First and Last Occurrences
Print N-bit binary numbers having more 1s than 0s
Sum of Products
Subarrays Product Less than K
Unique Number II
Modular Exponentiation
Largest prime factor
Maximum Tip Calculator
Minimum number of deletions and insertions
Maximize dot product
String Subsequence
Mobile numeric keypad
Perfect Sum Problem
Smallest number
Trail of ones
K-Palindrome
Longest subsequence-1
Power Set
Count ways to N'th Stair(Order does not matter)
Minimum Cost To Make Two Strings Identical
nCr
Geek and its Game of Coins
Minimum steps to destination
Partition Equal Subset Sum
Count digit groupings of a number
Matchsticks game
Prime Pair with Target Sum
Nth Natural Number
Number of paths in a matrix with k coins
Game with String
Next Permutation
Maximum sum of hour glass
Exit Point in a Matrix
Rotate Each Row of Matrix K Times
Stream First Non-repeating
Number of Rectangles in a Circle
Largest square formed in a matrix
Integral Points Inside Triangle
Replace O's with X's
Traverse All Edges And Vertices
Find the string in grid
Largest subsquare surrounded by X
Shortest Source to Destination Path
Divisibility tree
Subarrays with sum K
Construct list using given q XOR queries
Prefix match with other strings
Shortest Prime Path
Remove all occurences of duplicates in a linked list
Minimize the Heights I
Course Schedule
Clone an Undirected Graph
Overlapping Intervals
Reverse a Stack
Maximum product subset of an array
Find shortest safe route in a matrix
Sort a k sorted doubly linked list
Minimum Multiplications to reach End
City With the Smallest Number of Neighbors at a Threshold Distance
Path With Minimum Effort
Shortest path in Directed Acyclic Graph
Majority Element - More Than n/3
Minimal Cost
Aggressive Cows
Combination Sum II
Shortest Path in Weighted undirected graph
Task Scheduler
Minimum Absolute Difference In BST
Lemonade Change
Maximum Sum Combination
Non-overlapping Intervals
Insert Interval
Partitions with Given Difference
Make array elements unique
Minimum repeat to make substring
Number of Good Components
Fraction pairs with sum 1
Flatten BST to sorted list
Minimize the Difference
Pairs violating the BST property
Kth common ancestor in BST
Find Max Inversions
Kth Missing Positive Number in a Sorted Array
Count Subarrays with given XOR
Count pairs with given sum
Find All Triplets with Zero Sum
Split array in three equal sum subarrays
Find H-Index
Count all triplets with given sum in sorted array
Binary Tree to DLL
Clone List with Next and Random
Min distance between two given nodes of a Binary Tree
Serialize and deserialize a binary tree
Subtraction in Linked List
Distinct occurrences
Alien Dictionary
Merge Sort on Doubly Linked List
String Permutations
Trapping Rain Water
Smallest window containing all characters
Solve the Sudoku
Minimum Cost Path
Burning Tree
Next Smallest Palindrome
Count Pairs in an Array
Search Pattern
Longest Prefix Suffix
Circle of strings
Longest repeating and non-overlapping substring
Sub-arrays with equal number of occurences
Edit Distance
Minimum Points To Reach Destination
Next Happy Number
Strictly Increasing Array
Generalised Fibonacci numbers
Boolean Parenthesization
Longest valid Parentheses
Possible Paths in a Tree
N-Queen Problem
Search Pattern (Rabin-Karp Algorithm)
Find all Critical Connections in the Graph
Stock Buy and Sell – Max 2 Transactions Allowed
Min Chars to Add for Palindrome
Maximum Connected group
Minimize Max Distance to Gas Station
Account Merge
Better String
Geekina Hate 1s
Find Length of Linked List
Minimum element in BST
Is Linked List Length Even?
Identical Linked Lists
Triplet Family
Start Coding
Sorted Array Search
Reverse a String
First n Fibonacci
Alternative Sorting
Java Hello World
Reverse digits
Binary number to decimal number
Valid Strings
Disk Placement
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