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BASIC (32)
EASY (98)
MEDIUM (94)
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SP - Palindrome Family
Reverse a linked list
Pairwise swap elements of a linked list
Node at a given index in linked list
Delete in a Doubly Linked List
Inorder Traversal
Reverse a Doubly Linked List
Check for BST
K distance from root
Mirror Tree
Two Mirror Trees
Height of Binary Tree
Balanced Tree Check
Kth from End of Linked List
Middle of a Linked List
Left View of Binary Tree
Transform to Sum Tree
Intersection Sorted Linked Lists
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Stack using two queues
Level Order in spiral form
Reverse Level Order Traversal
DFS of Graph
Implement stack using array
Insert a node in a BST
Identical Trees
Nodes without a Sibling
Insertion at doubly linked list
Lowest Common Ancestor in a BST
Level Order Line by Line
BST Keys in a Range
Odd even level difference
Josephus problem
Expression Tree
Delete in a Singly Linked List
Kth largest element in BST
Max and min element in Binary Tree
Full Binary Tree
Find length of Loop
Linked List Matrix
Sum of Leaf Nodes
Sum of Right Leaf Nodes
Sum of Left Leaf Nodes
Exchange the Leaf Nodes
Sum of Leaf Nodes at Min Level
Tilt of Binary Tree
First Set Bit
Rightmost different bit
Check K-th Bit
Longest Consecutive 1's
Power of 2
Swap odd and even bits
Equilibrium Point
Array Leaders
Check if a string is Isogram or not
Anagram
Winner of an election
Reverse Words
Non Repeating Character
Parenthesis Checker
Generate Binary Numbers
Count number of hops
Check Equal Arrays
Missing in Array
Product array puzzle
Buildings receiving sunlight
Maximum no of 1's row
Chocolate Distribution Problem
Count the triplets
Pairs with difference k
Smallest subarray with sum greater than x
Sort Array II
1[0]1 Pattern Count
Common Subsequence
Toppers Of Class
Second Largest
Convert array into Zig-Zag fashion
Second most repeated string in a sequence
Check if array contains contiguous integers
Modify the Array
Even and odd elements at even and odd positions
String comparison
Element with left side smaller and right side greater
Four Elements
Palindrome String
Number of 1 Bits
Reverse Bits
Swap two nibbles in a byte
Copy Set Bits in Range
Toggle bits in the given range
Party of Couples
Palindrome numbers
Maximum height of the staircase
Prime number of set bits
Print Pattern
Binary Tree K level sum
Array to BST
Rotate Array
Print Linked List
Find Length of Linked List
Count Leaves in Binary Tree
Postorder Traversal
Preorder Traversal
Search a node in BST
Linked List Insertion At End
Is Linked List Length Even?
Sum of Binary Tree
Count Non-Leaf Nodes in Tree
Bit Difference
Number is sparse or not
Binary String
Remove common characters and concatenate
First n Fibonacci
Immediate Smaller Element
Uncommon characters
Swap kth elements
Reversing the vowels
Repeated Character
Replace the Bit
Last index of One
Merge two strings
Largest Element in Array
Boolean String Value
Binary representation
Set kth bit
Find the fine
Reverse digits
Closest Number
Height of Heap
Clone List with Next and Random
Min distance between two given nodes of a Binary Tree
Max Path Sum 2 Special Nodes
Trapping Rain Water
Solve the Sudoku
Distinct palindromic substrings
Edit Distance
Palindromic Partitioning
Matrix Chain Multiplication
Word Ladder II
Sorting Elements of an Array by Frequency
SP - Special Subsequences
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
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Sum Tree
Connect Nodes of Levels
Flattening a Linked List
Diagonal Tree Traversal
Tree Boundary Traversal
LCA in Binary Tree
Binary Heap Operations
Find the number of islands
Extreme nodes in alternate order
Validate an IP Address
Remove loop in Linked List
Palindrome Linked List
Delete keys in a Linked list
Longest Palindrome in Linked List
Find triplets with zero sum
Sort a stack
Top View of Binary Tree
k-th Smallest in BST
Find Common Nodes in two BSTs
Level order traversal
Polynomial Addition
Complete Binary Tree
Isomorphic Trees
Diagonal sum in binary tree
ZigZag Tree Traversal
Count Number of SubTrees having given Sum
Vertical Width of a Binary Tree
Count set bits
Reverse array in groups
Possible Words From Phone Digits
Rearrange Array Alternately
Stock buy and sell
Kadane's Algorithm
Majority Element
Count Inversions
Unique BST's
Indexes of Subarray Sum
Triplet Sum in Array
Number of pairs
Merge Without Extra Space
Spirally traversing a matrix
Stock span problem
Next Greater Element
Minimum Platforms
Ways to Reach the n'th Stair
Egg Dropping Puzzle
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Implement Trie
Print Anagrams Together
Excel Sheet | Part - 1
Sort 0s, 1s and 2s
Sum of Middle elements of two sorted arrays
Single Among Doubles in a Sorted
Consecutive 1's not allowed
Pythagorean Triplet
Search in Rotated Sorted Array
Print Binary Tree levels in sorted order
Form the Largest Number
Column name from a given column number
Sort in specific order
Sum of two large numbers
Magnet Array Problem
Longest Common Substring
Longest Palindrome in a String
Look and Say Pattern
K-th element of two Arrays
Rod Cutting
Find k-th character in string
Palindrome in Alphanumeric String
Permutations of a String
Max Sum Increasing Subsequence
Count ways to N'th Stair(Order does not matter)
Knapsack with Duplicate Items
Prime Pair with Target Sum
Number of paths
Return two prime numbers
How Many X's?
Exit Point in a Matrix
Total Decoding Messages
Snake and Ladder Problem
Floyd Warshall
Recursively Remove Adjacent Duplicates
Reverse an Array
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