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BASIC (5)
EASY (45)
MEDIUM (105)
HARD (14)
- 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
- Count BST nodes that lie in a given range
- Check for BST
- Quick Sort
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Heap Sort
- Sum Tree
- Tree Boundary Traversal
- Directed Graph Cycle
- Undirected Graph Cycle
- LCA in Binary Tree
- Lowest Common Ancestor in a BST
- The Celebrity Problem
- Topological sort
- Merge K sorted linked lists
- Find the number of islands
- Gas Station
- Dijkstra Algorithm
- Minimum Spanning Tree
- Palindrome Linked List
- Rat in a Maze
- BST with Dead End
- Merge two BST 's
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Level order traversal
- Merge Sort for Linked List
- Populate Inorder Successor for all nodes
- Isomorphic Trees
- Predecessor and Successor
- Deletion in Circular Linked List
- Median of BST
- Normal BST to Balanced BST
- Duplicate Subtrees
- Sum of nodes on the longest path
- ZigZag Tree Traversal
- Kadane's Algorithm
- Count Inversions
- Triplet Sum in Array
- Spirally traversing a matrix
- Distance of nearest cell having 1
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Strings Rotations of Each Other
- Postfix Evaluation
- Next Greater Element
- Minimum Cost of ropes
- Fractional Knapsack
- Minimum Platforms
- M-Coloring Problem
- Minimum Jumps
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Implement Trie
- Rotten Oranges
- Steps by Knight
- Rotate by 90 degree
- Maximum Product Subarray
- Row with max 1s
- Count the Reversals
- Max Sum without Adjacents
- Factorials of large numbers
- Longest Palindrome in a String
- Minimum swaps and K together
- Longest Palindromic Subsequence
- First negative in every window of size k
- Minimize the Heights II
- Valid Substring
- Permutations of a String
- Coin Change (Count Ways)
- Mobile numeric keypad
- Smallest number
- nCr
- Choose and Swap
- Game with String
- Next Permutation
- Longest Repeating Subsequence
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Check Mirror in N-ary tree
- Find the string in grid
- Floyd Warshall
- Negative weight cycle
- Course Schedule
- Overlapping Intervals
- Reverse a Stack
- Maximum Meetings in One Room
- Buy Maximum Stocks
- Interleave the First Half of the Queue with Second Half
- Minimum Cost to cut a board into squares
- Validate Stack Operations
- Expression contains redundant bracket or not
- Minimum time taken by each job to be completed given by a Directed Acyclic Graph
- Geek's Training
- Aggressive Cows
- Find the first node of loop in linked list
- Minimum Spanning Tree - Kruskal's Algorithm
- Group Balls by Sequence
- Reverse a linked list
- Delete nodes having greater value on right
- Remove duplicates from an unsorted linked list
- Split a Linked List into two halves
- Reverse a Doubly Linked List
- Insertion Sort
- Right View of Binary Tree
- Height of Binary Tree
- Balanced Tree Check
- Kth from End of Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Intersection Sorted Linked Lists
- Remove Duplicates from a Sorted Linked List
- Reverse Level Order Traversal
- DFS of Graph
- BFS of graph
- Binary Tree to BST
- Leaves at Same Level or Not
- Multiply two linked lists
- Kth largest element in BST
- Three way partitioning
- Minimum element in BST
- Reverse Using Stack
- Queue Reversal
- Reverse first K of a Queue
- Find Sum Pairs Across Two BSTs
- Delete Mid of a Stack
- Parenthesis Checker
- N meetings in one room
- Max Value Permutation
- Common in 3 Sorted Arrays
- Chocolate Distribution Problem
- Swap and Maximize
- Smallest subarray with sum greater than x
- Alternate Positive Negative
- Convert a sentence into its equivalent mobile numeric keypad sequence
- Second Largest
- Two sum -Pairs with 0 Sum
- Palindrome String
- Shop in Candy Store
- Split the binary string into substrings with equal number of 0s and 1s
- Move Last Element to Front of a Linked List
- Stock Buy and Sell – Max one Transaction Allowed
- 1-D prefix sum
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Trapping Rain Water
- Histogram Max Rectangular Area
- Solve the Sudoku
- Search Pattern
- Longest Prefix Suffix
- Edit Distance
- Median in a row-wise sorted Matrix
- Word Wrap
- Huffman Encoding
- Stock Buy and Sell – Max 2 Transactions Allowed
- Maximum difference between pair in a matrix
- K Centers Problem
