Java

• Interview Questions on Strings
• Interview Questions on Array
• Interview Questions on Two Pointers
• Interview Questions on Linked List
• Interview Questions on Tree, Stack, and Queue
• Interview Questions on Graph
• Interview Questions on Backtracking
• Interview Questions on Dynamic Programming
• Interview Questions on Bit Manipulation
• Interview Questions on Design

Interview Questions on Strings

• Reverse Words in a String
• Reverse Words II
• String to Integer
• Zigzag Conversion
• Simplify Path
• Permutation in String
• One Edit Distance
• Multiply Strings
• Longest Word in Dictionary Through Deleting
• Monotone Increasing Digits
• Replace Words
• Split Concatenated Strings
• Reconstruct Original Digits from English
• Push Dominoes
• Validate IP Address
• Minimum Add to Make Parentheses Valid
• Longest Palindromic Substring
• Longest Substring Without Repeating Characters
• Decode String
• Word Break
• Repeated DNA Sequences

Interview Questions on Array

• Product of Array Except Self
• Rotate Matrix
• Set Matrix Zeroes
• Merge Intervals
• First Missing Positive
• Fruit Into Baskets
• Sort Colors
• Battleships in a Board
• Sparse Matrix Multiplication
• Maximum Swap
• H-Index
• Insert Interval
• Increasing Triplet Subsequence
• Subarray Sum Equals K
• Pour Water
• Card Flipping Game
• Champagne Tower
• Number of Subarrays With Bounded Maximum
• Minimum Time Difference
• Reveal Cards in Increasing Order
• Longest Line of Consecutive One in Matrix
• Meeting Scheduler
• Array Nesting
• Minimum Swaps to Group All 1's Together
• Jump Game
• Asteroid Collision
• Best Time to Sell Stock II
• Find All Duplicates Numbers in an Array
• Sequential Digits
• Gas Station
• Rotate Array
• Minimum Domino Rotations for Equal Row
• Majority Element II
• House Robber II
• Spiral Matrix
• Group Anagrams

Interview Questions on Two Pointers

• Three Sum
• Four Sum
• 3sum Closest
• Remove Duplicates from Sorted Array II
• Minimum Size Subarray Sum
• Subarray Product Less Than K
• Number of Matching Subsequences
• Container With Most Water

Interview Questions on Linked List

• Flatten Binary Tree to Linked List
• Add Two Linked Lists
• Odd Even Linked List
• Rotate List
• Swap Nodes in Pairs [Iterative]
• Delete the Middle Node of a Linked List
• Reverse Linked List II
• Merge in Between Linked Lists
• Copy List With Random Pointer
• Swap Nodes in Pairs
• Split Linked List in Parts
• Next Greater Node in Linked List
• Reverse Node in Even Length Group
• LRU Cache
• Design Linked List

Interview Questions on Tree, Stack, and Queue

• Exclusive Time of Functions
• Binary Tree Right Side View
• Boundary of Binary Tree
• Convert Sorted Array to BST
• Lowest Common Ancestor of a Binary Tree
• Most Frequent Subtree Sum
• Convert Postorder and Inorder Traversal to Binary Tree
• Convert Preorder and Inorder Traversal to Binary Tree
• Sorted Array to BST
• Valid Binary Search Tree
• Largest BST Subtree
• Inorder Successor in BST
• Populating Next Right Pointers in Each Node
• Binary Tree Inorder Traversal
• Maximum Binary Tree
• Find Bottom Left Tree Value
• Binary Tree Longest Consecutive Sequence Find Difference II
• Minimum Absolute Difference in BST
• Equal Tree Partition
• Split BST
• Closest Leaf in a Binary Tree
• Maximum Width of Binary Tree
• All Nodes Distance K in Binary Tree
• All Possible Full Binary Trees
• Flip Equivalent Binary Trees
• Construct Binary Tree from String
• Find Largest Value in Each Tree Row
• Find Bottom Left Tree Value
• Maximum Level Sum of a Binary Tree
• Validate Binary Search Tree
• Implement Trie

Interview Questions on Graph

• Clone Graph
• Is Graph Bipartite?
• Number of Islands
• Number of Closed Islands
• Pacific Atlantic Water Flow
• Graph Valid Tree

Interview Questions on Backtracking

• Combinations
• Combinations Sum
• Combinations Sum II
• Letter Phone Number
• Palindrome Partitioning
• Permutations
• Permutations II
• Subsets
• Subsets II
• Word Search
• Matchstick to Square
• Generate Parentheses

Interview Questions on Dynamic Programming

• Best Time to Buy and Sell Stocks
• Best Time to Buy and Sell Stock With Transaction Fee
• Coin Change
• Coin Change II
• Decode Ways
• Longest Increasing Subsequence
• Longest Palindromic Subsequence
• Maximum Product Subarray
• Unique Binary Search Trees
• Can I Win
• Maximal Square
• Continuous Subarray Sum
• Number of Corner Rectangles
• Largest Plus Sign
• Knight Probability in Chessboard
• Stone Game
• Out of Boundary Paths
• Ones and Zeroes
• Number of Dice Rolls With Target Sum
• Toss Strange Coins
• Knight Dialer

Interview Questions on Bit Manipulation

• Sum of Two Integers
• Divide Two Integers
• Total Hamming Distance
• Gray Code
• Bitwise AND of Numbers Range
• Integer Replacement

Interview Questions on Design

• Encode and Decode Tiny URL
• Insert Delete Get Random
• Design Twitter
• Tic-Tac-Toe
• Binary Search Tree Iterator
• Flatten Nested List Iterator
• Add and Search Word- Data Structure Design