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BASIC (13)
EASY (66)
MEDIUM (82)
HARD (12)
Reverse a linked list
Frequency in a Linked List
Pairwise swap elements of a linked list
Remove duplicates from an unsorted linked list
Split a Linked List into two halves
Inorder Traversal
Bubble Sort
Selection Sort
Insertion Sort
Right View of Binary Tree
K distance from root
Mirror Tree
Two Mirror Trees
Maximum Width of 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
Find Transition Point
Queue using two Stacks
Remove Duplicates from a Sorted Linked List
Level Order in spiral form
Reverse Level Order Traversal
DFS of Graph
Stack using Linked List
Insert a node in a BST
BFS of graph
Identical Trees
Nodes without a Sibling
Binary Search
Minimum Depth of a Binary Tree
Odd even level difference
Minimum distance in an Array
Array Duplicates
Minimum element in BST
Full Binary Tree
Symmetric Tree
Maximum Node Level
Queue Reversal
Remove Half Nodes
Height of Spiral Tree
Sum of Left Leaf Nodes
Equilibrium Point
Array Leaders
Anagram
String Rotated by 2 Places
Reverse Words
Parenthesis Checker
Missing in Array
Roman Number to Integer
Cousins in Tree
Missing And Repeating
Sort Array II
Remove Duplicates
Twice Counter
Second Largest
Two Sum - Pair with Given Sum
Number of occurrence
Longest Common Prefix of Strings
Number of 1 Bits
Palindrome
Assign Mice Holes
Pair cube count
Trailing zeroes in factorial
Rotate Array
Print Linked List
Count Leaves in Binary Tree
Queue using Linked List
Preorder Traversal
First Occurence
Alternates in an Array
Binary Array Sorting
Check for subsequence
Largest Element in Array
Rotate Array by One
Rotating an Array
Binary number to decimal number
Rotate a Linked List
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
Check for BST
Merge Sort
Quick Sort
Binary Tree from Inorder and Postorder
Bottom View of Binary Tree
Delete without head pointer
Intersection in Y Shaped Lists
Diameter of a Binary Tree
Heap Sort
Merge two sorted linked lists
Sum Tree
Connect Nodes of Levels
Flattening a Linked List
Stack using Queue
Delete a node from BST
Directed Graph Cycle
LCA in Binary Tree
Lowest Common Ancestor in a BST
The Celebrity Problem
Topological sort
Vertical Tree Traversal
Get Min from Stack
Gas Station
Linked List to Binary Tree
Remove loop in Linked List
Implement Atoi
Palindrome Linked List
Strongly Connected
Top View of Binary Tree
k-th Smallest in BST
Peak element
Ancestors in Binary Tree
Binary Tree to CDLL
Vertical sum
Isomorphic Trees
Diagonal sum in binary tree
Find length of Loop
Sum of nodes on the longest path
ZigZag Tree Traversal
Pairwise swap of nodes in Linked List
Wave Array
Stock buy and sell
Kadane's Algorithm
Majority Element
Indexes of Subarray Sum
Stock span problem
Next Greater Element
K Sized Subarray Maximum
Kth smallest element
Stickler Thief
Egg Dropping Puzzle
Minimum number of jumps
Longest Increasing Subsequence
Longest Common Subsequence
0 - 1 Knapsack Problem
Equal Sum Partition
Shortest Common Supersequence
Longest Substring Without Repeating Characters
Maximize The Cut Segments
Overlapping Intervals
Sort 0s, 1s and 2s
Pascal Triangle
Maximum Index
Form a palindrome
Nuts and Bolts Problem
Longest Common Substring
Minimum Deletions
Valid Substring
Minimum Swaps for Bracket Balancing
Permutations of a String
Minimum number of deletions and insertions
Max Sum Increasing Subsequence
Coin Change (Count Ways)
Longest Repeating Subsequence
Stream First Non-repeating
Segregate even and odd nodes in a Linked List
Recursively Remove Adjacent Duplicates
Linked List Group Reverse
Binary Tree to DLL
Clone List with Next and Random
Serialize and deserialize a binary tree
Max Path Sum 2 Special Nodes
Trapping Rain Water
Histogram Max Rectangular Area
Merge Without Extra Space
Ugly Numbers
Edit Distance
Minimum sum partition
Matrix Chain Multiplication
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