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SCHOOL (1)
BASIC (70)
EASY (178)
MEDIUM (153)
HARD (18)
Sorting Elements of an Array by Frequency
Sort a linked list of 0s, 1s and 2s
Rearrange a linked list
Detect Loop in linked list
Count BST nodes that lie in a given range
Merge Sort
Quick Sort
Binary Tree from Inorder and Postorder
Bottom View of Binary Tree
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Heap Sort
Merge two sorted linked lists
Add all greater values to every node in a BST
Connect Nodes of Levels
Flattening a Linked List
Delete a node from BST
Undirected Graph Cycle
LCA in Binary Tree
Two Stacks in an Array
Max sum path in two arrays
The Celebrity Problem
Largest subarray with 0 sum
Topological sort
Merge K sorted linked lists
Find the number of islands
Max sum in the configuration
Serialize and deserialize a binary tree
Remove loop in Linked List
Interleaved Strings
Sorted subsequence of size 3
Implement Atoi
Maximum Difference
Palindrome Linked List
Print matrix in diagonal pattern
Bipartite Graph
Count distinct elements in every window
Find triplets with zero sum
Find Common Nodes in two BSTs
Polynomial Addition
Union of Two Linked Lists
Binary Tree to CDLL
Occurences of 2 as a digit
Counting elements in two arrays
Construct Tree from Inorder & Preorder
Leaves to DLL
Children Sum in a Binary Tree
ZigZag Tree Traversal
C++ Generic sort
Reverse array in groups
Smallest Positive Missing
Power Of Numbers
Wave Array
Rearrange an array with O(1) extra space
Rotate Array
Kadane's Algorithm
Majority Element
Binary Array Sorting
Count Inversions
Smallest Positive missing number
Union of 2 Sorted Arrays
Indexes of Subarray Sum
Count the number of possible triangles
Triplet Sum in Array
Boolean Matrix
Spirally traversing a matrix
Search in a sorted Matrix
Rotate by 90 degree
Subarray with 0 sum
Subarrays with equal 1s and 0s
Longest Consecutive Subsequence
Stock span problem
Next Greater Element
K Sized Subarray Maximum
Kth smallest element
Activity Selection
Minimum Platforms
Stickler Thief
Ways to Reach the n'th Stair
Egg Dropping Puzzle
Minimum number of jumps
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Equal Sum Partition
Sort according to an Array
Find whether path exist
Kth Smallest
Implement Trie
Rotten Oranges
Maximize The Cut Segments
Container With Most Water
Print Anagrams Together
Rotate by 90 degree
Top K Frequent in Array
K closest point to origin
Word Break
Hard Arrangement
4 Sum - All Quadruples
Excel Sheet | Part - 1
Sort 0s, 1s and 2s
Flip Bits
Longest Span in two Binary Arrays
Single Among Doubles in a Sorted
Consecutive 1's not allowed
Single Among Doubles
Pythagorean Triplet
Pair Sum Closest to 0
Search in Rotated Sorted Array
Maximum Intervals Overlap
Form the Largest Number
Longest subarray with sum divisible by K
Row with max 1s
Nuts and Bolts Problem
Longest Subarray with Sum K
Transform String
Magnet Array Problem
Smallest distinct window
K-th element of two Arrays
Triplets with Smaller Sum
Rod Cutting
Missing element of AP
Longest Palindromic Subsequence
Maximum difference of zeros and ones in binary string
Permutations of a String
Game of XOR
Largest prime factor
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Sieve of Eratosthenes
Coin Change (Minimum Coins)
Power Set
Find distinct elements
nCr
Handshakes
Count distinct pairs with difference k
Magic Triplets
Subset Sums
Number of paths
Knight Walk
Jumping Numbers
Find the Safe Position
Segregate even and odd nodes in a Linked List
Largest square formed in a matrix
Water Overflow
Snake and Ladder Problem
Transitive closure of a Graph
Express as sum of power of natural numbers
Flood fill Algorithm
Shortest Source to Destination Path
Recursively Remove Adjacent Duplicates
Overlapping Intervals
Pair Sum in a Sorted and Rotated Array
Triangle and Square
M and N
Reverse a linked list
Delete N nodes after M nodes of a linked list
Pairwise swap elements of a linked list
Node at a given index in linked list
Remove duplicates from an unsorted linked list
Delete in a Doubly Linked List
Inorder Traversal
Reverse a Doubly Linked List
Bubble Sort
Selection Sort
Insertion Sort
Check for BST
Right View of Binary Tree
Mirror Tree
Two Mirror Trees
Delete without head pointer
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
Find Transition Point
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Stack using two queues
Reverse Level Order Traversal
DFS of Graph
Stack using Linked List
Insert a node in a BST
BFS of graph
Square Root
Lowest Common Ancestor in a BST
Binary Search
Largest subarray of 0's and 1's
Remove Duplicates Sorted Array
Level Order Line by Line
BST Keys in a Range
Remove Duplicates from an array
Binary Tree to BST
Unique rows in boolean matrix
Remove every k'th node
Third largest element
Convert to Roman No
Match specific pattern
Josephus problem
Delete in a Singly Linked List
Kth largest element in BST
Minimum distance in an Array
Array Duplicates
Special Stack
Level order traversal
Inorder Successor in BST
Index of an Extra Element
Intersection of Two Linked Lists
Insert in a Sorted List
More than n/k Occurrences
Counting Sort
Reverse Using Stack
Delete Alternate Nodes
Find length of Loop
Median of BST
Maximum Pairwise Computed Value
Reverse first K of a Queue
Delete Mid of a Stack
Learn to Comment
GetLine and Ignore
Learning to be precise
Learning Macros
Matrix Interchange
Swap values using References
Swap the objects
Structs and Objects
Two Dimensional World
Learning Structs
Delete Array
Find the Frequency
Back to Front
Pair Sum in Vector
Student of the Year
Java ArrayList Operation
Reverse an Array
Min Heap implementation
Max and Second Max
Check K-th Bit
Power of 2
Swap odd and even bits
Frequencies in a Limited Array
Equilibrium Point
Array Leaders
Floor in a Sorted Array
Closet 0s 1s and 2s
Print adjacency list
Print Matrix in snake Pattern
Transpose of Matrix
Matrix Boundary Traversal
Anagram
Winner of an election
String Rotated by 2 Places
Reverse Words
Non Repeating Character
Parenthesis Checker
N meetings in one room
Largest number with given sum
Count number of hops
Check Equal Arrays
Nth number made of prime digits
Positive Negative Pair
Two Sum
Missing in Array
First Non Repeating Character
Product array puzzle
Roman Number to Integer
Super Balanced Network
Harry-The Clever Boy
Repeated Pattern Length
Parcel Distribution
Password Decryption
Exploding Cars
Pizza Love
Algorithm Experts and Software Developers
Intersection of Arrays with Distinct
Excel Sheet | Part - 2
Missing And Repeating
Subarrays with given sum
Non-Repeating Element
Adding Ones
Common in 3 Sorted Arrays
Maximum no of 1's row
Search in a Row-Column sorted matrix
Move All Zeroes to End
Missing number
Chocolate Distribution Problem
Count the triplets
Remove Duplicates
Nearest multiple of 10
Facing the sun
Second Largest
Convert array into Zig-Zag fashion
Two Sum - Pair with Given Sum
Second most repeated string in a sequence
Number of occurrence
Does array represent Heap
Longest common prefix
Convert an array to reduced form
Check if array is sorted
Counts Zeros Xor Pairs
Two sum -Pairs with 0 Sum
Inverse Permutation
Three Great Candidates
At Least K Occurrences
Count the Zeros
Distinct absolute array elements
Smallest greater elements in whole array
Odd Even Problem
Swap bits in byte
Adding Array Elements
Number of 1 Bits
The Nth Fibonnaci
Armstrong Numbers
Reverse Bits
Palindrome
Prime Number
Maximum Sum Problem
Euler Totient Function
Minimum number of Coins
Perfect Numbers
Pair cube count
Maximize Toys
Sum of all prime numbers between 1 and n
Series GP
Find nth root of m
Inorder Traversal and BST
Print Pattern
Count all possible paths from top left to bottom right
Ceil in a Sorted Array
Reorder List
Binary Tree to DLL
Max rectangle
Alien Dictionary
Max Path Sum 2 Special Nodes
Trapping Rain Water
Smallest window containing all characters of another string
Histogram Max Rectangular Area
Solve the Sudoku
Median of 2 Sorted Arrays of Different Sizes
Merge Without Extra Space
Edit Distance
Minimum sum partition
Matrix Chain Multiplication
Longest valid Parentheses
Word Break - 2
Brackets in Matrix Chain Multiplication
Closest Palindrome
Rotate Array
Sort String
Print Linked List
Count Linked List Nodes
Count Leaves in Binary Tree
Postorder Traversal
Implement stack using array
Queue using Linked List
Queue Using Array
Doubly linked list Insertion at given position
Add two fractions
Replace all 0's with 5
Count zeros in a sorted matrix
Print number pattern
Preorder Traversal
First Occurence
Sum Except First and Last
Search a node in BST
Peak element
Play with an array
Minimum element in BST
Anagram of String
Circular Linked List Traversal
Triplet Family
Alternates in an Array
The Size of
Sort and Reverse Vector
Front to Back
Binary String
Power Using Recursion
First n Fibonacci
Binary Array Sorting
Searching in an Array
Count pair sum
Sort the Half Sorted
Anagram Palindrome
Sort The Array
Immediate Smaller Element
Repeated Character
Last index of One
Upper Case Conversion
Sort the string in descending order
Merge two strings
One odd Occuring
Array Subset
Count of smaller elements
Min and Max in Array
GCD of Array
GCD of two numbers
Find unique element
Find position of set bit
Set kth bit
LCM And GCD
Median of an Array
Factorial
Sum of Digit is Palindrome or not
Reverse digits
Binary number to decimal number
Closest Number
Series AP
Multiplication Table
Print 1 to n without using loops
Count Squares
Print the Kth Digit
Height of Heap
Pairs of prime number
nPr
Squares in a Matrix
Sorted matrix
Data Type
Search in a 2D Matrix
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