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BASIC (8)
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MEDIUM (109)
HARD (18)
- Pairwise swap elements of a linked list
- Reverse a Doubly Linked List
- Balanced Tree Check
- Delete Middle of Linked List
- Decimal Equivalent of Binary Linked List
- Intersection Sorted Linked Lists
- Find Transition Point
- Reverse Level Order Traversal
- Identical Trees
- Nodes without a Sibling
- Remove every k'th node
- Minimum distance in an Array
- Level order traversal
- Insert in a Sorted List
- Sum of leaf nodes in BST
- More than n/k Occurrences
- Symmetric Tree
- Count Pairs whose sum is equal to X
- Reverse first K of a Queue
- Brothers From Different Roots
- Swap the array elements
- Predict the Column
- Xoring and Clearing
- Rightmost different bit
- Check K-th Bit
- Frequencies in a Limited Array
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Winner of an election
- String Rotated by 2 Places
- Strings Rotations of Each Other
- Isomorphic Strings
- Panagram Checking
- N meetings in one room
- Count ways to N'th Stair
- Missing in Array
- Roman Number to Integer
- Count the elements
- Find the closest number
- Move All Zeroes to End
- String Duplicates Removal
- Count pairs Sum in matrices
- Find Pair Given Difference
- Maximum Possible Sum of Products
- Does array represent Heap
- Find missing in second array
- Play With OR
- At Least K Occurrences
- Minimum Operations
- Divisibility by 8
- Compute sum of digits in all numbers from 1 to n
- Party of Couples
- Shortest path from 1 to n
- Sum 1 to n Divisors
- Form a number divisible by 3 using array digits
- Recursive sequence
- Inorder Traversal and BST
- Print Pattern
- Sum of dependencies in a graph
- Smallest window containing 0, 1 and 2
- Fibonacci series up to Nth term
- Divisor Game
- Save Civilians
- Min Jump
- Separate Stone
- Balloon Everywhere
- Maximum Number
- Beautiful Number
- Strong Students in School
- Array Game
- Silver and Gold
- High Frequency
- Weird Island
- Construction of a string
- Same characters
- Maximum AND
- Find Bots on Geeklandster
- Negative Prefix
- Maximum occurring digit
- Min AND
- Virus Infection
- Reverse alternate nodes in Link List
- Add Number Linked Lists
- Merge 2 sorted linked list in reverse order
- Insert in Sorted Circular Linked List
- Flattening a Linked List
- Largest subarray with 0 sum
- Implement Atoi
- Print matrix in diagonal pattern
- Rat in a Maze Problem - I
- BST with Dead End
- Duplicate Subtree
- Find Common Nodes in two BSTs
- Euler Circuit in an Undirected Graph
- Euler circuit and Path
- Binary Tree to CDLL
- K Sum Paths
- Children Sum in a Binary Tree
- Diagonal sum in binary tree
- Normal BST to Balanced BST
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Gray to Binary Conversion
- Maximum Index
- Indexes of Subarray Sum
- Level of Nodes
- Determinant of a Matrix
- Distance of nearest cell having 1
- Unit Area of largest region of 1's
- Fractional Knapsack
- Job Sequencing Problem
- Minimum Platforms
- Combination Sum
- M-Coloring Problem
- Detect Cycle using DSU
- Optimal Strategy For A Game
- Find whether path exist
- Kth Smallest
- Implement Trie
- Shortest Common Supersequence
- Top K Frequent in Array
- Word Break
- Sort 0s, 1s and 2s
- Paths to reach origin
- Pascal Triangle
- Number of subarrays with maximum values in given range
- Top k numbers in a stream
- Pythagorean Triplet
- Form the Largest Number
- Longest subarray with sum divisible by K
- Check if a string is repetition of its substring of k-length
- Check if frequencies can be equal
- Substrings with K Distinct
- Shuffle integers
- Find the N-th character
- Sum of XOR of all pairs
- LCS of three strings
- Largest Sum Subarray of Size at least K
- Minimize the Heights II
- Transform to prime
- Minimum Deletions
- Print N-bit binary numbers having more 1s than 0s
- Number following a pattern
- Sum of Products
- Bleak Numbers
- Game of XOR
- Modified Game of Nim
- Maximize dot product
- Max Sum Increasing Subsequence
- Sequence of Sequence
- Coin Change (Minimum Coins)
- Knapsack with Duplicate Items
- Partition Equal Subset Sum
- Count possible ways to construct buildings
- Count digit groupings of a number
- Array Pair Sum Divisibility Problem
- Subset Sums
- Number of paths
- Game with String
- Smith Number
- Maximum sum of hour glass
- How Many X's?
- Exit Point in a Matrix
- Transitive closure of a Graph
- Techfest and the Queue
- Subset Sum Problem
- Search Pattern (Rabin-Karp Algorithm)
- Remove K Digits
- Find duplicate rows in a binary matrix
- Paths from root with a specified sum
- Shortest Prime Path
- Insertion Sort for Singly Linked List
- Unique Number III
- All Unique Permutations of an array
- Course Schedule
- Target Sum
- Maximum Meetings in One Room
- Buy Maximum Stocks
- Graph is Tree or Not
- Eventual Safe States
- Path With Minimum Effort
- Minimum Absolute Difference In BST
- Partitions with Given Difference
- Floor in BST
- Water the plants
- Total pairs
- Minimum Distance Graph
- New Year Resolution
- Grinding Geek
- Flatten BST to sorted list
- Subtraction in Linked List
- AVL Tree Insertion
- Search Pattern (KMP-Algorithm)
- Number of distinct subsequences
- Sum-string
- Minimum sum partition
- Palindromic Partitioning
- Strictly Increasing Array
- Generalised Fibonacci numbers
- Boolean Parenthesization
- Distribute candies in a binary tree
- Split Array Largest Sum
- Find the String
- Vertex Cover
- Candy
- Better String
- Geekina Hate 1s
- Making A Large Island
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