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BASIC (17)
EASY (62)
MEDIUM (131)
HARD (23)
- Nearly Sorted Algorithm
- Merge Sort
- Quick Sort
- Bottom View of Binary Tree
- Diameter of a Binary Tree
- Sum Tree
- Connect Nodes of Levels
- Flattening a Linked List
- Diagonal Tree Traversal
- Tree Boundary Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Largest subarray with 0 sum
- Topological sort
- Generate IP Addresses
- Dijkstra Algorithm
- Sorted subsequence of size 3
- Count Palindromic Subsequences
- Minimum Swaps to Sort
- Implement Atoi
- Maximum Difference
- Strongly Connected
- Rat in a Maze Problem - I
- Bipartite Graph
- Pots of Gold Game
- Merge two BST 's
- Bridge edge in a graph
- Sort a stack
- Find the missing no in string
- Top View of Binary Tree
- Populate Inorder Successor for all nodes
- Counting elements in two arrays
- Foldable Binary Tree
- Predecessor and Successor
- Normal BST to Balanced BST
- Construct Tree from Preorder Traversal
- ZigZag Tree Traversal
- Count Number of SubTrees having given Sum
- Tower Of Hanoi
- Power Of Numbers
- Maximum Index
- Kadane's Algorithm
- Count Inversions
- Indexes of Subarray Sum
- Merge Without Extra Space
- Unit Area of largest region of 1's
- Stock span problem
- Next Greater Element
- Activity Selection
- Minimum Platforms
- Largest number in K swaps
- Egg Dropping Puzzle
- Longest Common Subsequence
- Lucky Numbers
- Allocate Minimum Pages
- Shortest Common Supersequence
- Rotate by 90 degree
- Generate Parentheses
- 4 Sum - All Quadruples
- Sort 0s, 1s and 2s
- Single Among Doubles
- Column name from a given column number
- Form a palindrome
- Nuts and Bolts Problem
- Longest Common Substring
- Longest Substring with K Uniques
- Arranging the array
- Longest Arithmetic Subsequence
- Rod Cutting
- Maximize the sum of selected numbers from a sorted array to make it empty
- Longest Palindromic Subsequence
- First and Last Occurrences
- Next higher palindromic number using the same set of digits
- Minimum Deletions
- Permutations of a String
- Number following a pattern
- Lexicographically smallest string
- Minimum number of deletions and insertions
- Coin Change (Count Ways)
- Coin Change (Minimum Coins)
- Perfect Sum Problem
- Power Of 2 and Subsequences
- Knapsack with Duplicate Items
- Partition Equal Subset Sum
- Stepping Numbers
- Jumping Numbers
- Find the Safe Position
- Smaller on Left
- Filling Bucket
- Longest Repeating Subsequence
- Composite and Prime
- Decode the string
- Total Decoding Messages
- Stream First Non-repeating
- Print leaf nodes from preorder traversal of BST
- Geek and Strings
- Find all distinct subset (or subsequence) sums
- Queries on a Matrix
- Express as sum of power of natural numbers
- Floyd Warshall
- Negative weight cycle
- Reverse Spiral Form of Matrix
- Save Your Life
- Hamiltonian Path
- Subset Sum Problem
- Search Pattern (Z-algorithm)
- Search Pattern (Rabin-Karp Algorithm)
- Substrings of length k with k-1 distinct elements
- Binary Matrix with at most K 1s
- BST to max heap
- Flatten binary tree to linked list
- IPL 2021 - Match Day 2
- Remove and Reverse
- Enemy
- Smallest sum contiguous subarray
- Array Removals
- Minimum Cost to cut a board into squares
- Stack Permutations
- Replace every element with the least greater element on its right
- Minimum increment/decrement to make array non-Increasing
- Minimum Swaps
- Number of Distinct Islands
- Shortest Distance in a Binary Maze
- K-periodic Circular String
- Number Of Islands
- Merging Details
- Maximum Multiple
- Number of Ways to Arrive at Destination
- Path With Minimum Effort
- Count Special Numbers
- Reverse a linked list
- Delete N nodes after M nodes of a linked list
- Right View of Binary Tree
- Mirror Tree
- Height of Binary Tree
- Balanced Tree Check
- Left View of Binary Tree
- Transform to Sum Tree
- Reverse Level Order Traversal
- BFS of graph
- Square Root
- Run Length Encoding
- Binary Tree to BST
- Kth largest element in BST
- Level order traversal
- Brothers From Different Roots
- Bitwise Operators
- Rightmost different bit
- Array Leaders
- Winner of an election
- Strings Rotations of Each Other
- Generate Binary Numbers
- Minimum Cost of ropes
- Count ways to N'th Stair
- Maximum value
- Max Value Permutation
- Missing And Repeating
- Find Kth Rotation
- String Duplicates Removal
- Amend The Sentence
- Count increasing Subarrays
- Alternate Positive Negative
- Same characters in two strings
- Palindrome String
- Fitting The Array
- Shop in Candy Store
- Max Sum Subarray of size K
- The Bit Game
- Smallest number with sum of digits as N and divisible by 10^N
- Check if it is possible to survive on Island
- Squares in N*N Chessboard
- Tom and Jerry
- Maximum Height Tree
- Next Prime Palindrome
- Help Ishaan
- Print the pattern
- Binary Tree K level sum
- Check if it is possible to convert one string into another with given constraints
- Minimum Exchange
- Earthquake and the Paint Shop
- Count all possible paths from top left to bottom right
- Ball coloring
- Modified Numbers and Queries
- Sum of k smallest elements in BST
- Print Diagonally
- Maximum number of 2X2 squares
- Minimum Swaps
- Smallest Subset with Greater Sum
- Minimum Sum of Absolute Differences of Pairs
- Move Last Element to Front of a Linked List
- Find pairs with given sum in doubly linked list
- Maximum Frequency
- Linked List Group Reverse
- Binary Tree to DLL
- Min distance between two given nodes of a Binary Tree
- Alien Dictionary
- Max of min for every window size
- Find median in a stream
- Burning Tree
- Ugly Numbers
- Minimum sum partition
- Number Formation
- Matrix Chain Multiplication
- Boolean Parenthesization
- Brackets in Matrix Chain Multiplication
- Phone directory
- Huffman Encoding
- Water Connection Problem
- Minimum operations to convert array A to B
- Count occurrences of a given word in a 2-d array
- Number of distinct words with K maximum contiguous vowels
- Shortest Path by Removing K walls
- Maximum Number of Toys
- Min Chars to Add for Palindrome
- Minimum time to fulfil all orders
- Rotate Array
- Implement stack using array
- Queue Using Array
- Search a node in BST
- Multiply Matrices
- Minimum element in BST
- Sum of Binary Tree
- Sum of numbers in string
- Change the string
- Rotate Array by One
- Red OR Green
- Binary number to decimal number
- Ways To Tile A Floor
- Count Squares
- Find the position of M-th item
- Middle of Three
- Max Min
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