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BASIC (33)
EASY (137)
MEDIUM (132)
HARD (6)
Reverse a linked list
Frequency in a Linked List
Delete N nodes after M nodes of a linked list
Pairwise swap elements of a linked list
Remove duplicates from an unsorted linked list
Inorder Traversal
Check for BST
Right View of Binary Tree
K distance from root
Mirror Tree
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
Delete Middle of Linked List
Intersection Sorted Linked Lists
Find Transition Point
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Stack using two queues
Level Order in spiral form
DFS of Graph
Stack using Linked List
Implement stack using array
BFS of graph
Identical Trees
Root to leaf path sum
Square Root
Lowest Common Ancestor in a BST
Binary Search
Run Length Encoding
Remove Duplicates Sorted Array
Level Order Line by Line
Minimum Depth of a Binary Tree
Binary Tree to BST
Match specific pattern
Josephus problem
Longest Consecutive Subsequence
Array Duplicates
Max Level Sum in Binary Tree
Special Stack
Level order traversal
Inorder Successor in BST
Index of an Extra Element
Level of a Node in Binary Tree
Counting Sort
Reverse Using Stack
Full Binary Tree
Symmetric Tree
Delete Alternate Nodes
Maximum Node Level
Linked List Matrix
Maximum Pairwise Computed Value
Remove Half Nodes
Sum of Leaf Nodes
Sum of Right Leaf Nodes
Sum of Left Leaf Nodes
Tilt of Binary Tree
Move all zeros to the front of the linked list
Delete Mid of a Stack
Rotate doubly Linked List
Get min at pop
Deque Implementations
First Set Bit
Rightmost different bit
Check K-th Bit
Power of 2
Swap odd and even bits
Equilibrium Point
Array Leaders
Floor in a Sorted Array
Intersection of two sorted arrays
Print adjacency list
Transpose of Matrix
Anagram
Isomorphic Strings
The Modified String
Reverse Words
Sum of numbers in string
Parenthesis Checker
Minimum indexed character
First Repeating Element
Check Equal Arrays
Find Immediate Smaller Than X
Missing in Array
Product array puzzle
Roman Number to Integer
Search an element in sorted and rotated array
StayHomeTask
Maximum selections
LCP
Mario & Pauline
Sort strings lexicographically according to given sequence of characters
Rotate Clockwise
Count Triplets
Next element with greater frequency
Cousins in Tree
Find sub-tree with average value of nodes equal to k
Missing And Repeating
Maximum no of 1's row
Move All Zeroes to End
String Duplicates Removal
Chocolate Distribution Problem
Largest Even Number
Rearrange a string
Remove Duplicates
Facing the sun
Greater on right side
Twice Counter
Second Largest
Convert array into Zig-Zag fashion
Two Sum - Pair with Given Sum
Number of occurrence
K-Pangrams
Divisible by 8
Does array represent Heap
Convert an array to reduced form
Longest Common Prefix of Strings
Two sum -Pairs with 0 Sum
At Least K Occurrences
Count the Zeros
Search array with adjacent diff at most k
Print Bracket Number
Number of 1 Bits
Armstrong Numbers
Maximum Sum Problem
Shortest path from 1 to n
Euler Totient Function
Minimum number of Coins
Maximum height of the staircase
Maximize Toys
Trailing zeroes in factorial
Recursive sequence
Sum of dependencies in a graph
Count all possible paths from top left to bottom right
Nearly Sorted Algorithm
Be-A-Bit-Wise
Rotate a Linked List
Sort a linked list of 0s, 1s and 2s
Add Number Linked Lists
Add 1 to a Linked List Number
Merge 2 sorted linked list in reverse order
Linked List in Zig-Zag fashion
Detect Loop in linked list
Count BST nodes that lie in a given range
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Merge two sorted linked lists
Add all greater values to every node in a BST
Connect Nodes of Levels
Flattening a Linked List
Tree Boundary Traversal
Directed Graph Cycle
Undirected Graph Cycle
Absolute List Sorting
Two Stacks in an Array
The Celebrity Problem
Merge K sorted linked lists
Find the number of islands
Get Min from Stack
Check if subtree
Is Binary Tree Heap
Validate an IP Address
Remove loop in Linked List
Multiply two strings
Minimum Swaps to Sort
Implement Atoi
Maximum Difference
Palindrome Linked List
Closest in BST
Delete keys in a Linked list
Count distinct elements in every window
Merge k Sorted Arrays
Root to leaf paths sum
Find triplets with zero sum
Sort a stack
Top View of Binary Tree
k-th Smallest in BST
Peak element
Euler circuit and Path
Binary Tree to CDLL
Predecessor and Successor
Leaves to DLL
Children Sum in a Binary Tree
Diagonal sum in binary tree
Deletion and Reverse in Circular Linked List
Convert Level Order Traversal to BST
Count Number of SubTrees having given Sum
Pairwise swap of nodes in Linked List
Count set bits
Reverse array in groups
Smallest Positive Missing
Power Of Numbers
Wave Array
Possible Words From Phone Digits
Rearrange Array Alternately
Stock buy and sell
Rotate Array
Kadane's Algorithm
Majority Element
Smallest Positive missing number
Union of 2 Sorted Arrays
Spirally traversing a matrix
Search in a sorted Matrix
Rotate by 90 degree
Unit Area of largest region of 1's
Strings Rotations of Each Other
Stock span problem
Infix to Postfix
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Number of Unique Paths
Sort according to an Array
X Total Shapes
Find whether path exist
Kth Smallest
Shortest Common Supersequence
Rotten Oranges
Steps by Knight
Most frequent word in an array of strings
Add a Digit
Lazy Kid
Shortest Distance to Every Character
Longest Palindrome Substring
Print Anagrams Together
Excel Sheet | Part - 1
Distorted Needle in Haystack
Mandatory Flip Bit
String Reduction Game
Pruning a Tree
Right View Sum
Construct BST from Postorder
Sort 0s, 1s and 2s
Single Among Doubles
Sum of bit differences
Maximum Intervals Overlap
Design a tiny URL or URL shortener
Sum of two large numbers
Reverse each word in a given string
k largest elements
Longest Common Substring
Smallest distinct window
Longest common substring value of two numbers
Longest substring with distinct characters
Longest Palindrome in a String
Look and Say Pattern
First negative in every window of size k
Permutations of a String
Coin Change (Count Ways)
Perfect Sum Problem
Count distinct pairs with difference k
Smaller on Left
Decode the string
Total Decoding Messages
Print leaf nodes from preorder traversal of BST
Largest square formed in a matrix
Snake and Ladder Problem
Your Social Network
Express as sum of power of natural numbers
Count the paths
Flood fill Algorithm
Recursively Remove Adjacent Duplicates
Overlapping Intervals
Carpet into Box
Rotate Array
Find Length of Linked List
Size of Binary Tree
Count Leaves in Binary Tree
Postorder Traversal
Queue using Linked List
Replace all 0's with 5
Count zeros in a sorted matrix
Preorder Traversal
First Occurence
Minimum element in BST
Pairwise Consecutive Elements
Count Non-Leaf Nodes in Tree
Queue Push & Pop
Who has the majority?
Number is sparse or not
Binary String
Remove common characters and concatenate
Fibonacci Using Recursion
Missing Characters in Panagram
Ishaan's Internship
Sort Array II
Segregate Even and Odd numbers
Immediate Smaller Element
Uncommon characters
Rotate Array by One
Array Subset
Extract Maximum
Set kth bit
Find the fine
LCM And GCD
Sum of Digit is Palindrome or not
Finding Position
Linked List Group Reverse
Binary Tree to DLL
Clone List with Next and Random
Trapping Rain Water
Median of Two sorted arrays
Next Smallest Palindrome
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