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SCHOOL (1)
BASIC (13)
EASY (69)
MEDIUM (131)
HARD (26)
- Rearrange characters
- Nearly Sorted Algorithm
- 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
- Binary Tree from Inorder and Postorder
- Bottom View of Binary Tree
- Intersection in Y Shaped Lists
- Diameter of a Binary Tree
- Merge two sorted linked lists
- Sum Tree
- Flattening a Linked List
- Diagonal Tree Traversal
- Stack using Queue
- Tree Boundary Traversal
- Delete a node from BST
- LCA in Binary Tree
- Two Stacks in an Array
- The Celebrity Problem
- Vertical Tree Traversal
- Merge K sorted linked lists
- Gas Station
- Kth smallest element in a Matrix
- Remove loop in Linked List
- Largest BST
- Multiply two strings
- Minimum Swaps to Sort
- Palindrome Linked List
- Rat in a Maze Problem - I
- Closest in BST
- BST with Dead End
- Merge two BST 's
- Merge k Sorted Arrays
- Sort a stack
- Duplicate Subtree
- Top View of Binary Tree
- k-th Smallest in BST
- Level order traversal
- Merge Sort for Linked List
- Pair Sum in BST
- Complete Binary Tree
- Populate Inorder Successor for all nodes
- Construct Tree from Inorder & Preorder
- Isomorphic Trees
- Maximum path sum from any node
- Predecessor and Successor
- Normal BST to Balanced BST
- Duplicate Subtrees
- Sum of nodes on the longest path
- Kth Ancestor in a Tree
- ZigZag Tree Traversal
- Ceil in BST
- Wave Array
- Rearrange an array with O(1) extra space
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Triplet Sum in Array
- Spirally traversing a matrix
- Rotate by 90 degree
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Postfix Evaluation
- Next Greater Element
- Nearly sorted
- Largest number in K swaps
- Combination Sum
- M-Coloring Problem
- Minimum Jumps
- Egg Dropping Puzzle
- Longest Common Subsequence
- 0 - 1 Knapsack Problem
- Allocate Minimum Pages
- Preorder to BST
- Zero Sum Subarrays
- Kth Smallest
- Shortest Common Supersequence
- Print Anagrams Together
- 4 Sum - All Quadruples
- Sort 0s, 1s and 2s
- Search in Rotated Sorted Array
- Smallest number with at least n trailing zeroes in factorial
- Maximum Product Subarray
- Row with max 1s
- Form a palindrome
- Nuts and Bolts Problem
- Transform String
- Count the Reversals
- Factorials of large numbers
- k largest elements
- Longest Common Substring
- Smallest distinct window
- Longest Palindrome in a String
- K-th element of two Arrays
- Triplets with Smaller Sum
- Rod Cutting
- Minimum swaps and K together
- Longest Palindromic Subsequence
- First negative in every window of size k
- Minimize the Heights II
- First and Last Occurrences
- Valid Substring
- Minimum number of deletions
- Minimum Swaps for Bracket Balancing
- Permutations of a String
- Minimum number of deletions and insertions
- Coin Change (Count Ways)
- Knapsack with Duplicate Items
- Partition Equal Subset Sum
- Min Coin
- Path of greater than equal to k length
- Next Permutation
- Longest Repeating Subsequence
- Preorder Traversal and BST
- Stream First Non-repeating
- Segregate even and odd nodes in a Linked List
- Check Mirror in N-ary tree
- Iterative Inorder
- Preorder traversal (Iterative)
- Iterative Postorder
- Subset Sum Problem
- All Palindromic Partitions
- Rearrange characters
- Flatten binary tree to linked list
- Target Sum
- Overlapping Intervals
- Reverse a Stack
- Validate Stack Operations
- Replace every element with the least greater element on its right
- 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
- Inorder Traversal
- Reverse a Doubly Linked List
- Check for BST
- Right View of Binary Tree
- Mirror Tree
- Maximum Width of Tree
- 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
- Intersection Sorted Linked Lists
- Find Transition Point
- Queue using two Stacks
- Remove Duplicates from a Sorted Linked List
- Reverse Level Order Traversal
- Insert a node in a BST
- Identical Trees
- Lowest Common Ancestor in a BST
- Equilibrium index of an array
- Leaves at Same Level or Not
- Multiply two linked lists
- Kth largest element in BST
- Special Stack
- Three way partitioning
- Inorder Successor in BST
- Index of an Extra Element
- Reverse Using Stack
- Symmetric Tree
- Median of BST
- Brothers From Different Roots
- Delete Mid of a Stack
- Rotate doubly Linked List
- Swap the array elements
- Equilibrium Point
- Array Leaders
- Parenthesis Checker
- Union of Arrays with Duplicates
- Product array puzzle
- Roman Number to Integer
- Mean of range in array
- Missing And Repeating
- Sort by Set Bit Count
- Adding Ones
- Common in 3 Sorted Arrays
- String Duplicates Removal
- Chocolate Distribution Problem
- Find Pair Given Difference
- Bitonic Point
- Single Number
- Remove Consecutive Characters
- Addition of submatrix
- Second most repeated string in a sequence
- Rope Cutting
- Find missing in second array
- Longest Common Prefix of Strings
- Min Number of Flips
- Two sum -Pairs with 0 Sum
- Count the Zeros
- Palindrome String
- Search array with adjacent diff at most k
- Max Sum Subarray of size K
- Arithmetic Number
- Geek and Snow Fighting
- Linked List Group Reverse
- Binary Tree to DLL
- Clone List with Next and Random
- Min distance between two given nodes of a Binary Tree
- Serialize and deserialize a binary tree
- Max rectangle
- Nodes at given distance in binary tree
- Fixing Two nodes of a BST
- Trapping Rain Water
- Max Circular Subarray Sum
- Smallest window containing all characters
- Histogram Max Rectangular Area
- Solve the Sudoku
- Burning Tree
- Merge Without Extra Space
- Count Pairs in an Array
- The Painter's Partition Problem-II
- Longest Prefix Suffix
- Minimum sum partition
- Palindromic Partitioning
- Matrix Chain Multiplication
- Median in a row-wise sorted Matrix
- Boolean Parenthesization
- Word Break - 2
- N-Queen Problem
- Minimum swap required to convert binary tree to binary search tree