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BASIC (9)
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MEDIUM (82)
HARD (10)
- Sorting Elements of an Array by Frequency
- Nearly Sorted Algorithm
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Add Number Linked Lists
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Insert in Sorted Circular Linked List
- Check for BST
- Quick Sort
- Bottom View of Binary Tree
- Delete without head pointer
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Merge two sorted linked lists
- Flattening a Linked List
- Undirected Graph Cycle
- Topological Sort
- Gas Station
- Remove loop in Linked List
- Implement Atoi
- Palindrome Linked List
- Top View of Binary Tree
- Merge Sort for Linked List
- Complete Binary Tree
- Tower Of Hanoi
- Reverse array in groups
- Smallest Positive Missing
- Rearrange Array Alternately
- Maximum Index
- Stock buy and sell
- Kadane's Algorithm
- Majority Element
- Count Inversions
- Indexes of Subarray Sum
- Boolean Matrix
- Spirally traversing a matrix
- Rotate by 90 degree
- Stock span problem
- Next Greater Element
- K Sized Subarray Maximum
- Kth smallest element
- Minimum Cost of ropes
- Activity Selection
- Minimum Platforms
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Allocate Minimum Pages
- Find whether path exist
- Shortest Common Supersequence
- Maximize The Cut Segments
- Count Occurences of Anagrams
- Pythagorean Triplet
- Search in Rotated Sorted Array
- Form the Largest Number
- Nuts and Bolts Problem
- Longest Subarray with Sum K
- Max Sum without Adjacents
- Reverse each word in a given string
- Longest Common Substring
- Longest Substring with K Uniques
- Longest Palindrome in a String
- Rod Cutting
- Number of pairs
- First negative in every window of size k
- Minimum Deletions
- Print N-bit binary numbers having more 1s than 0s
- Minimum number of deletions
- Minimum number of deletions and insertions
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Sieve of Eratosthenes
- Coin Change (Minimum Coins)
- Knapsack with Duplicate Items
- Partition Equal Subset Sum
- Count possible ways to construct buildings
- Find the Safe Position
- Rank The Permutations
- Longest Repeating Subsequence
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Subset Sum Problem
- 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
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Delete in a Doubly Linked List
- Inorder Traversal
- Reverse a Doubly Linked List
- Two Mirror Trees
- Height of Binary Tree
- Kth from End of Linked List
- Middle of a Linked List
- Intersection Sorted Linked Lists
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Insertion at doubly linked list
- Binary Search
- Largest subarray of 0's and 1's
- Delete in a Singly Linked List
- Special Stack
- Inorder Successor in BST
- Intersection of Two Linked Lists
- Insert in a Sorted List
- Split Linked List Alternatingly
- Delete Alternate Nodes
- Merge Lists Alternatingly
- Delete Mid of a Stack
- 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
- Floor in a Sorted Array
- Anagram
- Reverse Words
- Parenthesis Checker
- Generate Binary Numbers
- Missing in Array
- Roman Number to Integer
- Missing And Repeating
- Minimize the sum of product
- Chocolate Distribution Problem
- Count the triplets
- Remove Duplicates
- Sum of two numbers represented as arrays
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Rotate Bits
- Pattern Searching
- Minimum Operations
- Number of 1 Bits
- Max Sum Subarray of size K
- Toggle bits in the given range
- Minimum number of Coins
- Discovering Atlantis
- Largest number possible
- Page Faults in LRU