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BASIC (16)
EASY (55)
MEDIUM (83)
HARD (5)
- Sorting Elements of an Array by Frequency
- Nearly Sorted Algorithm
- Rotate a Linked List
- Sort a linked list of 0s, 1s and 2s
- Detect Loop in linked list
- Count BST nodes that lie in a given range
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Merge two sorted linked lists
- Sum Tree
- Directed Graph Cycle
- The Celebrity Problem
- Topological sort
- Wildcard Pattern Matching
- Remove loop in Linked List
- Palindrome Linked List
- Rat in a Maze Problem - I
- k-Anagram
- Merge k Sorted Arrays
- Root to leaf paths sum
- Sort a stack
- k-th Smallest in BST
- Merge Sort for Linked List
- Children Sum in a Binary Tree
- ZigZag Tree Traversal
- Count set bits
- Kadane's Algorithm
- Majority Element
- Unique BST's
- Indexes of Subarray Sum
- Triplet Sum in Array
- Spirally traversing a matrix
- Unit Area of largest region of 1's
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Stock span problem
- Next Greater Element
- K Sized Subarray Maximum
- Stickler Thief
- Ways to Reach the n'th Stair
- Longest Increasing Subsequence
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Allocate Minimum Pages
- Kth Smallest
- Implement Trie
- Shortest Common Supersequence
- Nth Catalan Number
- Rotten Oranges
- Word Break
- Generate Parentheses
- Sort 0s, 1s and 2s
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Count Occurences of Anagrams
- Form the Largest Number
- Maximum Product Subarray
- Row with max 1s
- Palindrome SubStrings
- Longest Common Substring
- Longest Substring with K Uniques
- K-th element of two Arrays
- Rod Cutting
- First negative in every window of size k
- Maximum difference of zeros and ones in binary string
- Valid Substring
- Friends Pairing Problem
- Minimum number of deletions and insertions
- Coin Change (Count Ways)
- Knapsack with Duplicate Items
- Temple Offerings
- Maximum path sum in matrix
- Partition Equal Subset Sum
- Longest Bitonic subsequence
- Get Minimum Squares
- Count the number of ways to tile the floor of size n x m using 1 x m size tiles
- Number of paths
- Longest Repeating Subsequence
- Flood fill Algorithm
- Number of Provinces
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- Reverse a linked list
- Pairwise swap elements of a linked list
- Inorder Traversal
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Delete without head pointer
- 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
- Queue using two Stacks
- Stack using two queues
- Reverse Level Order Traversal
- DFS of Graph
- Binary Search
- Third largest element
- Multiply two linked lists
- Three way partitioning
- Level order traversal
- Reverse Using Stack
- Symmetric Tree
- Queue Reversal
- Reverse first K of a Queue
- Delete Mid of a Stack
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- Longest Consecutive 1's
- Power of 2
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Anagram
- Parenthesis Checker
- Minimum Cost of ropes
- Union of Arrays with Duplicates
- Missing in Array
- Missing And Repeating
- Common in 3 Sorted Arrays
- Move All Zeroes to End
- Chocolate Distribution Problem
- Count the triplets
- Smallest subarray with sum greater than x
- Remove Duplicates
- Second most repeated string in a sequence
- Longest Common Prefix of Strings
- Two sum -Pairs with 0 Sum
- Element with left side smaller and right side greater
- Palindrome String
- Number of 1 Bits
- Party of Couples
- Shortest path from 1 to n
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