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BASIC (12)
EASY (123)
MEDIUM (126)
HARD (19)
Rotate a Linked List
Add 1 to a Linked List Number
Detect Loop in linked list
Quick Sort on Linked List
Insert in Sorted Circular Linked List
Bottom View of Binary Tree
Delete without head pointer
Sum Tree
Construct Binary Tree from Parent Array
LCA in Binary Tree
Max sum path in two arrays
The Celebrity Problem
Topological sort
Merge K sorted linked lists
Find the number of islands
Get Min from Stack
Linked List to Binary Tree
Kth smallest element in a Matrix
Validate an IP Address
Additive sequence
Largest BST
Maximum Difference
Palindrome Linked List
Print matrix in diagonal pattern
Rat in a Maze Problem - I
Merge two BST 's
Root to leaf paths sum
Find triplets with zero sum
Level order traversal
Root to Leaf Paths
XOR Linked List
Linked List that is Sorted Alternatingly
Leftmost and rightmost nodes of binary tree
Insert in Sorted way in a Sorted DLL
Diagonal sum in binary tree
Deletion and Reverse in Circular Linked List
Duplicate Subtrees
Sum of nodes on the longest path
Kth Ancestor in a Tree
ZigZag Tree Traversal
Gray to Binary Conversion
Smallest Positive Missing
Rotate and delete
Kadane's Algorithm
Two Repeated Elements
Indexes of Subarray Sum
Number of pairs
Spirally traversing a matrix
Subarray range with given sum
Sort Elements by Decreasing Frequency
Next Greater Element
K Sized Subarray Maximum
Minimum Cost of ropes
Job Sequencing Problem
Minimum Platforms
Ways to Reach the n'th Stair
Sum of all substrings of a number
Longest Common Subsequence
0 - 1 Knapsack Problem
Lucky Numbers
Kth Smallest
Shortest Common Supersequence
Maximize The Cut Segments
Rotate by 90 degree
Closest Three Sum
Sort 0s, 1s and 2s
Maximize Number of 1's
Sum of Middle elements of two sorted arrays
Split the Array
Search in Rotated Sorted Array
Count pairs Sum in matrices
Row with max 1s
Form a palindrome
Nuts and Bolts Problem
Find the N-th character
Longest Common Substring
K-th element of two Arrays
Rod Cutting
K closest elements
Longest Palindromic Subsequence
Minimum sum
Not a subset sum
Minimize the Heights II
Minimum Deletions
Print N-bit binary numbers having more 1s than 0s
Permutations of a String
Sum of Products
Modular Exponentiation
Maximum Tip Calculator
Minimum number of deletions and insertions
Coin Change (Count Ways)
Mobile numeric keypad
Coin Change (Minimum Coins)
Perfect Sum Problem
Smallest number
K-Palindrome
Count ways to N'th Stair(Order does not matter)
Minimum steps to destination
Help Classmates
Prime Pair with Target Sum
Nth Natural Number
Longest alternating subsequence
Rotate Each Row of Matrix K Times
Check If two Line segments Intersect
Largest square formed in a matrix
Integral Points Inside Triangle
Preorder traversal (Iterative)
Subset Sum Problem
Longest Palindromic Substring
Number of Provinces
BST to greater sum tree
Remove all occurences of duplicates in a linked list
Design Browser History
Maximum product subset of an array
Find shortest safe route in a matrix
Sort a k sorted doubly linked list
Shortest Path in Undirected Graph
Minimal Cost
Combination Sum II
Shortest Path in Weighted undirected graph
Partitions with Given Difference
Minimum repeat to make substring
Number of Good Components
Meeting Rooms II
Find All Triplets with Zero Sum
Split array in three equal sum subarrays
Reverse a linked list
Frequency in a Linked List
Linked list of strings forms a palindrome
Delete in a Doubly Linked List
Check for BST
Right View of Binary Tree
K distance from root
Mirror Tree
Maximum Width of Tree
Height of Binary Tree
Balanced Tree Check
Middle of a Linked List
Left View of Binary Tree
Delete Middle of Linked List
Reverse Level Order Traversal
DFS of Graph
Insert a node in a BST
BFS of graph
Root to leaf path sum
Square Root
Nodes without a Sibling
Lowest Common Ancestor in a BST
Minimum Depth of a Binary Tree
Remove Duplicates from an array
Odd even level difference
Toeplitz matrix
Remove every k'th node
Multiply two linked lists
Max distance between same elements
Delete in a Singly Linked List
Kth largest element in BST
Inorder Successor in BST
Index of an Extra Element
Split Linked List Alternatingly
Sum of leaf nodes in BST
Max and min element in Binary Tree
Delete Alternate Nodes
Find the Sum of Last N nodes of the Linked List
Find length of Loop
Median of BST
Linked List Matrix
Remove Half Nodes
Sum of Left Leaf Nodes
Swap the array elements
Xoring and Clearing
Array Leaders
Roof Top
Transpose of Matrix
Reverse Words
Parenthesis Checker
N meetings in one room
Missing in Array
Product array puzzle
LCP
Max Value Permutation
Missing And Repeating
Count the elements
Find the closest number
String Duplicates Removal
Move all negative elements to end
Chocolate Distribution Problem
Count the triplets
Find Pair Given Difference
Pairs with difference k
Swap and Maximize
Bitonic Point
Sort Array II
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
K-Pangrams
Does array represent Heap
Modify the Array
Longest Common Prefix of Strings
Min Number of Flips
Substrings with same first and last characters
Segregate 0s and 1s
Play With OR
At Least K Occurrences
Palindrome String
Total count
Print Bracket Number
Odd Even Problem
Padovan Sequence
Extract the Number from the String
Number of 1 Bits
Find the Highest number
Armstrong Numbers
AND operation
Reverse Bits
Swap two nibbles in a byte
Count numbers containing 4
The Palindrome Pattern
Compare two fractions
Juggler Sequence
Summed Matrix
Row with Minimum 1s
Coverage of all Zeros in a Binary Matrix
Array to BST
Even and Odd
Maximising score
Count pairs with given sum
Insert an Element at the Bottom of a Stack
Same characters
Even subarray sum
Fibonacci series up to Nth term
Unique Positions
Minimum Number of Elements
Super Palindrome
Find Mode in BST
Two Smallests in Every Subarray
Split an array into two equal Sum subarrays
Largest Pair Sum
Two Swaps
Meeting Rooms
Find Length of Linked List
Search a node in BST
Is Linked List Length Even?
Identical Linked Lists
Triplet Family
Friendly Array
Alternative Sorting
Immediate Smaller Element
String with numbers at its end
Ishaan Loves Chocolates
GCD of two numbers
Valid Triangle
Binary Tree to DLL
Clone List with Next and Random
Min distance between two given nodes of a Binary Tree
LRU Cache
Alien Dictionary
String Permutations
Smallest window containing all characters
Minimum Cost Path
Burning Tree
Palindrome SubStrings
Count Smaller elements
Longest Prefix Suffix
Sub-arrays with equal number of occurences
Edit Distance
Longest valid Parentheses
N-Queen Problem
Kth Smallest Number in Multiplication Table
Maximum Connected group
Minimize Max Distance to Gas Station
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