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BASIC (26)
EASY (172)
MEDIUM (270)
HARD (39)
Reverse alternate nodes in Link List
Rotate a Linked List
Sort a linked list of 0s, 1s and 2s
Add Number Linked Lists
Add 1 to a Linked List Number
Detect Loop in linked list
QuickSort on Doubly Linked List
Count BST nodes that lie in a given range
Quick Sort
Diameter of a Binary Tree
Heap Sort
Merge two sorted linked lists
Diagonal Tree Traversal
Undirected Graph Cycle
Two Stacks in an Array
Topological sort
Merge K sorted linked lists
Find kth element of spiral matrix
Generate IP Addresses
Largest BST
Count Palindromic Subsequences
Multiply two strings
Bipartite Graph
Closest in BST
BST with Dead End
Pots of Gold Game
Longest Palindrome in Linked List
Find triplets with zero sum
Duplicate Subtree
Find Common Nodes in two BSTs
Polynomial Addition
Delete nodes greater than k
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
Vertical sum
Isomorphic Trees
Predecessor and Successor
Normal BST to Balanced BST
Kth Ancestor in a Tree
Mother Vertex
Ceil in BST
Count total set bits
Smallest Positive Missing
Power Of Numbers
Rearrange an array with O(1) extra space
Majority Element
Indexes of Subarray Sum
Merge Without Extra Space
Level of Nodes
Make Matrix Beautiful
Unit Area of largest region of 1's
Subarray with 0 sum
Case-specific Sorting of Strings
K Sized Subarray Maximum
Nearly sorted
Activity Selection
Unique Subsets
M-Coloring Problem
Minimum Jumps
Detect Cycle using DSU
Stickler Thief
Egg Dropping Puzzle
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Lucky Numbers
Preorder to BST
X Total Shapes
Find whether path exist
Shortest Common Supersequence
Nth Catalan Number
Count subsequences of type a^i, b^j, c^k
Top K Frequent in Array
Stock Buy and Sell – Multiple Transaction Allowed
Word Search
4 Sum - All Quadruples
Excel Sheet | Part - 1
Sort 0s, 1s and 2s
Pascal Triangle
Maximum Index
Number of subarrays with maximum values in given range
Flip Bits
Equivalent Sub-Arrays
Count Occurences of Anagrams
Count of Subarrays
Pythagorean Triplet
Smallest factorial number
Maximize The Array
Alternate Vowel and Consonant String
Super Primes
Longest subarray with sum divisible by K
Column name from a given column number
Substrings with K Distinct
Form a palindrome
Longest Subarray with Sum K
Transform String
Number of positive integral solutions
Cutting Binary String
Sum of two large numbers
Shuffle integers
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
Arranging the array
String formation from substring
Rod Cutting
Longest Palindromic Subsequence
First negative in every window of size k
Minimize the Heights II
First and Last Occurrences
Reaching the heights
Minimum Deletions
Nine Divisors
Permutations of a String
Number following a pattern
Friends Pairing Problem
CamelCase Pattern Matching
Subarrays Product Less than K
Unique Number II
Bleak Numbers
Largest prime factor
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Santa Banta
Perfect Sum Problem
Firing employees
Power Set
Knapsack with Duplicate Items
nCr
Number of ways
Subsets with XOR value
Partition Equal Subset Sum
Min Coin
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
Fill the Tank
Number of paths
Knight Walk
Permutation with Spaces
Fact Digit Sum
Jumping Numbers
Party in Town
Smith Number
Geek and knots
How Many X's?
Matrix Exponentiation
Longest Repeating Subsequence
Finding Profession
Stream First Non-repeating
Maximum Sub-String after at most K changes
Villain Con
Tricky Subset Problem
Rat Maze With Multiple Jumps
Pairs of Non Coinciding Points
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 numbers with odd occurrences
Find all distinct subset (or subsequence) sums
Check Mirror in N-ary tree
Queries on Strings
Special Matrix
Broken blocks
Express as sum of power of natural numbers
Find the string in grid
Shortest Uncommon Subsequence
Biconnected Graph
Help a Thief!!!
Count the paths
Floyd Warshall
Negative weight cycle
Form coils in a matrix
Shortest Source to Destination Path
Base Equivalence
Shortest Path between Cities
Moving on grid
Height Using Parent Array
Recursively Remove Adjacent Duplicates
Theft at World Bank
Jump Game
Subset Sum Problem
Bellman-Ford
Partition a Linked List around a given value
Count pairs in array divisible by K
Number of Provinces
Prefix match with other strings
Binary Matrix with at most K 1s
Maximum sum leaf to root path
Maximum GCD of siblings of a binary tree
BST to greater sum tree
Division without using multiplication, division and mod operator
Subsets
Course Schedule
Find and Replace in String
Longest Possible Route in a Matrix with Hurdles
Find k-th smallest element in given n ranges
Even Swap
Reverse a Stack
Farthest number
Hit most Balloons
Maximum Meetings in One Room
Max Equal sum of 3 Stacks
Concatenate Equal to Target
Exactly one swap
Maximum Winning score
Compute Before Matrix
Levels Of Game
Special Keyboard 2
Maximum selections
LCP
Next element with greater frequency
Sum of nodes within k distance from target
Minimum Multiplications to reach End
Eventual Safe States
Merging Details
Shortest path in Directed Acyclic Graph
Sum of Beauty of All Substrings
Smaller Sum
Task Scheduler
Lemonade Change
Maximum Sum Combination
Floor in BST
Intersection Point in Y Shaped Linked Lists
Prime List
Connect Nodes at Same Level
Minimum Steps Required
Distinct Difference
Unequal Arrays
Job Sequencing Problem
Bheem Wants Ladoos
Prefix Suffix String
Smaller Sum
Shortest XY distance in Grid
BST Maximum Difference
Nearest smaller tower
Another Coin Change Problem
Find Number
Max Coins
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
Happy Subarrays
Modify Linked List-1
Find Kth permutation
Fraction pairs with sum 1
Reverse a linked list
Delete N nodes after M nodes of a linked list
Pairwise swap elements of a linked list
Delete nodes having greater value on right
Remove duplicates from an unsorted linked list
Reverse a Doubly Linked List
Right View of Binary Tree
Height of Binary Tree
Balanced Tree Check
Kth from End of Linked List
Middle of a Linked List
Left View of Binary Tree
Delete Middle of Linked List
Intersection Sorted Linked Lists
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
Insert a node in a BST
BFS of graph
Identical Trees
Lowest Common Ancestor in a BST
Binary Tree to BST
Unique rows in boolean matrix
Josephus problem
Delete in a Singly Linked List
Kth largest element in BST
Minimum distance in an Array
Array Duplicates
Inorder Successor in BST
Insert in a Sorted List
Reverse Using Stack
Symmetric Tree
Next Right Node
Find length of Loop
Median of BST
Leaf under budget
Queue Reversal
Brothers From Different Roots
Delete Mid of a Stack
Predict the Column
Frequency in Queue
Get min at pop
Frequency Game
First Set Bit
K-th Bit is Set or Not
Power of 2
Wave Array
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
String Rotated by 2 Places
Strings Rotations of Each Other
Isomorphic Strings
Reverse Words
Non Repeating Character
Minimum Cost of ropes
N meetings in one room
Largest number with given sum
Union-Find
Count number of hops
Missing in Array
Roman Number to Integer
Adding Ones
Move All Zeroes to End
Min sum formed by digits
Chocolate Distribution Problem
Bitonic Point
Alternate Positive Negative
Second Largest
Rotate Bits
Number of occurrence
Reversing the equation
Counts Zeros Xor Pairs
Hungry Pizza Lovers
Find the closest pair from two arrays
Palindrome String
Smallest greater elements in whole array
Fitting The Array
Shop in Candy Store
Partition a number into two divisible parts
Is Binary Number Multiple of 3
Minimum Operations
Adding Array Elements
Number of 1 Bits
Armstrong Numbers
Reverse Bits
Max Sum Subarray of size K
Nth Fibonacci Number
Change Bits
Copy Set Bits in Range
Count Digits
Shortest path from 1 to n
Sum 1 to n Divisors
Minimum number of Coins
Number Of Open Doors
Perfect Numbers
Nth item through sum
Largest number possible
Check if it is possible to survive on Island
Form a number divisible by 3 using array digits
Least Prime Factor
Sum of First N Natural Numbers
Tom and Jerry
Maximum Diamonds
Arithmetic Number
Surround the 1's
Trace Path
Inorder Traversal and BST
Letters Collection
Help the Old Man!!!
Print Pattern
Primes sum
Maximum Sum LCM
Array to BST
Sum of dependencies in a graph
Modified Numbers and Queries
Fraction Trouble
Sum of two numbers without using arithmetic operators
Even and Odd
Search insert position of K in a sorted array
Count the Substrings
Find all possible paths from top to bottom
Smallest Subset with Greater Sum
Minimum Sum of Absolute Differences of Pairs
Smallest window containing 0, 1 and 2
Can Make Triangle
Matrix Operations
Find pairs with given sum in doubly linked list
Triangle and Square
Bus Conductor
Yet another query problem
Minimum Number
Consecutive Occurrence
Find XOR of numbers from L to R.
Maximum Depth Of Binary Tree
Equilibrium Point
Pass by Reference and Value
Bots on social media
Balloon Everywhere
Cutting Rectangles
Make Array Elements Equal
Equal Left and Right Subarray Sum
Make the array beautiful
Remainder on dividing by 11
Taxi Booking
Number of Subarrays of 0's
Maximum Identical Bowls
Bus Conductor
Wifi Range
Minimum Number
Minimum Integer
String Mirror
Powerfull Integer
Make Palindrome
Binary Modulo
Total Cuts
Bit Magic
Array Operations
Dominant Pairs
Total Traversal Time
Binary Array
Ticket Counter
Unique Number of Occurrences
Linked List Group Reverse
Binary Tree to DLL
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
Solve the Sudoku
Next Smallest Palindrome
Count Smaller elements
Number of distinct subsequences
Sum-string
Palindromic Partitioning
Next Happy Number
Kill Captain America
Bike Racing
Word Break - 2
Brackets in Matrix Chain Multiplication
Closest Palindrome
Assignment Problem
Longest Path in a matrix
Huffman Encoding
Minimum X (xor) A
Sorted Linked List to BST
Array Partition
Reverse a sublist of a linked list
Find number of closed islands
Find the String
Geek in a Maze
Expression Add Operators
Better String
Count Binary Strings With No Consecutive 1s
Median of the Subarrays
Minimum BST Sum Subtree
Cake Distribution Problem
Min Time
Game Of Subsets
Making A Large Island
Queue using Linked List
Sum Except First and Last
Palindromic Array
Linked List Insertion At End
Circular Linked List Traversal
Bit Difference
Print 1 To N Without Loop
Array Search
Binary Array Sorting
Reverse a String
First n Fibonacci
Immediate Smaller Element
Repeated Character
Elements in the Range
Game with nos
Exceptionally odd
Ishaan Loves Chocolates
Min and Max in Array
1s Complement
Odd or Even
Find position of set bit
Set the rightmost unset bit
LCM And GCD
Sum of first n terms
Swap two numbers
Max Min
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