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SCHOOL (1)
BASIC (23)
EASY (125)
MEDIUM (154)
HARD (28)
Delete nodes having greater value on right
Remove duplicates from an unsorted linked list
Bubble Sort
Selection Sort
Right View of Binary Tree
K distance from root
Mirror Tree
Kth from End of Linked List
Middle of a Linked List
Delete Middle of Linked List
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
Nodes without a Sibling
Lowest Common Ancestor in a BST
Remove Duplicates from an array
Binary Tree to BST
Unique rows in boolean matrix
Remove every k'th node
Multiply two linked lists
You and your books
Max distance between same elements
Count Occurrence of digit k
Delete in a Singly Linked List
Kth largest element in BST
Array Duplicates
Three way partitioning
Inorder Successor in BST
Split Linked List Alternatingly
Count Pairs whose sum is equal to X
Find length of Loop
Median of BST
Leaf under budget
Linked List Matrix
Queue Reversal
Closest Neighbour in BST
Delete Mid of a Stack
Swap the array elements
Xoring and Clearing
Frequency in Queue
Frequency Game
First Set Bit
Power of 2
Equilibrium Point
Array Leaders
Roof Top
Print adjacency list
Transpose of Matrix
Reverse Words
Non Repeating Character
Parenthesis Checker
Minimum Cost of ropes
Count ways to N'th Stair
Count number of hops
First Repeating Element
Missing in Array
Missing And Repeating
Non-Repeating Element
Count the elements
Find the closest number
Adding Ones
Move All Zeroes to End
String Duplicates Removal
Chocolate Distribution Problem
Find Pair Given Difference
Pairs with difference k
Swap and Maximize
Single Number
Alternate Positive Negative
Nearest multiple of 10
Facing the sun
Second Largest
Rotate Bits
Number of occurrence
Reversing the equation
Check if array is sorted
Find missing in second array
At Least K Occurrences
Find the closest pair from two arrays
Palindrome String
Total count
Is Binary Number Multiple of 3
Number of 1 Bits
Find the Highest number
Armstrong Numbers
Reverse Bits
Nth Fibonacci Number
Swap two nibbles in a byte
Copy Set Bits in Range
Count Digits
Sum Of Digits
Party of Couples
Sum 1 to n Divisors
N-divisors
Perfect Numbers
Magic numbers
Largest number possible
Trailing zeroes in factorial
Least Prime Factor
Sum of First N Natural Numbers
Left Index
Recursive sequence
Juggler Sequence
Maximum Diamonds
Row with Minimum 1s
Surround the 1's
Most Booked Hotel Room
Insert an Element at the Bottom of a Stack
Fibonacci series up to Nth term
Maximum Depth Of Binary Tree
Divisor Game
Max and Second Max
Max Level Sum in Binary Tree
Maximum Identical Bowls
Ticket Counter
Unique Number of Occurrences
Beautiful Number
Strong Students in School
Burger Ingredient Optimization
Eye's Contact
Two Smallests in Every Subarray
Largest Pair Sum
Find Length of Linked List
Minimum element in BST
Alternates in an Array
Print 1 To N Without Loop
Array Search
Reverse a String
First n Fibonacci
Sum of Natural Numbers
Value equal to index value
Largest Element in Array
GCD of two numbers
Addition of Two Numbers
LCM And GCD
Mean of an Array
Cube root of a number
Find n-th term of series 1, 3, 6, 10, 15, 21
Factorial
Perfect Number
Greatest of three numbers
Binary number to decimal number
Count Squares
Swap two numbers
Geekland Elections
Sort a linked list of 0s, 1s and 2s
Add Number Linked Lists
Quick Sort
Binary Tree from Inorder and Postorder
Delete without head pointer
Heap Sort
Two Stacks in an Array
Max sum path in two arrays
Topological sort
Find the number of islands
Find kth element of spiral matrix
Serialize and deserialize a binary tree
Wildcard Pattern Matching
Additive sequence
Sorted subsequence of size 3
Multiply two strings
Maximum Difference
Palindrome Linked List
Print matrix in diagonal pattern
Closest in BST
Merge two BST 's
Find triplets with zero sum
Level order traversal
Union of Two Linked Lists
Euler Circuit in an Undirected Graph
Root to Leaf Paths
XOR Linked List
Linked List that is Sorted Alternatingly
Leftmost and rightmost nodes of binary tree
Arrange Consonants and Vowels
Vertical sum
Isomorphic Trees
Predecessor and Successor
Diagonal sum in binary tree
Deletion and Reverse in Circular Linked List
Sum of nodes on the longest path
Kth Ancestor in a Tree
ZigZag Tree Traversal
Mother Vertex
Gray to Binary Conversion
Smallest Positive Missing
Power Of Numbers
Rotate and delete
Rearrange an array with O(1) extra space
Maximum Index
Two Repeated Elements
Union of 2 Sorted Arrays
Indexes of Subarray Sum
Number of pairs
Merge Without Extra Space
Make Matrix Beautiful
Subarray range with given sum
Sort Elements by Decreasing Frequency
K Sized Subarray Maximum
Minimum Jumps
Stickler Thief
Optimal Strategy For A Game
Sum of all substrings of a number
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Lucky Numbers
Nth Catalan Number
Maximize The Cut Segments
Stock Buy and Sell – Multiple Transaction Allowed
Word Search
4 Sum - All Quadruples
Sort 0s, 1s and 2s
Paths to reach origin
Maximum Index
Flip Bits
Split the Array
Count pairs Sum in matrices
Sum of bit differences
Form the Largest Number
Add Binary Strings
Check if frequencies can be equal
Find the N-th character
k largest elements
Longest Substring with K Uniques
Longest Palindrome in a String
Arranging the array
Rod Cutting
K closest elements
Longest Palindromic Subsequence
Not a subset sum
Minimize the Heights II
First and Last Occurrences
Print N-bit binary numbers having more 1s than 0s
Permutations of a String
CamelCase Pattern Matching
Sum of Products
Subarrays Product Less than K
Unique Number II
Modular Exponentiation
Largest prime factor
Minimum number of deletions and insertions
Maximize dot product
Minimum cost to fill given weight in a bag
Coin Change (Count Ways)
Santa Banta
String Subsequence
Perfect Sum Problem
K-Palindrome
Longest subsequence-1
Minimum Cost To Make Two Strings Identical
nCr
Geek and its Game of Coins
Minimum steps to destination
Partition Equal Subset Sum
Matchsticks game
Nth Natural Number
Maximum sum of hour glass
Exit Point in a Matrix
Longest Repeating Subsequence
Stream First Non-repeating
Replace O's with X's
Rohan's Love for Matrix
Express as sum of power of natural numbers
Find the string in grid
Largest subsquare surrounded by X
Shortest Source to Destination Path
Divisibility tree
Prefix match with other strings
Maximum Time
Reverse a Stack
Max Equal sum of 3 Stacks
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
Combination Sum II
Task Scheduler
Minimum Absolute Difference In BST
Lemonade Change
Maximum Sum Combination
Partitions with Given Difference
Number of Good Components
Tree Transformation
Construct a Full Binary Tree
Modify Linked List-1
Find Kth permutation
Subarray Counting
Fraction pairs with sum 1
Minimize the Difference
Pairs violating the BST property
Kth common ancestor in BST
Arranging Horses
Maximum Doublet XOR
Strong Indices
Linked List Group Reverse
Binary Tree to DLL
Clone List with Next and Random
AVL Tree Deletion
Merge Sort on Doubly Linked List
String Permutations
Smallest window containing all characters
Solve the Sudoku
Minimum Cost Path
Next Smallest Palindrome
Count Pairs in an Array
Longest Prefix Suffix
Circle of strings
Longest repeating and non-overlapping substring
Sub-arrays with equal number of occurences
Minimum Points To Reach Destination
Next Happy Number
Strictly Increasing Array
Generalised Fibonacci numbers
Longest valid Parentheses
Possible Paths in a Tree
N-Queen Problem
Search Pattern (Rabin-Karp Algorithm)
Expression Add Operators
Minimize Max Distance to Gas Station
Account Merge
Min Time
Geekland Is Haunted
Search in a 2D Matrix
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