Coding

See all these frontend coding interview questions and solutions!

Total: 152

• Two Sum
• Valid Parentheses
• Merge Two Sorted Lists
• Merge K Sorted Lists
• Best Time to Buy and Sell Stock
• Valid Palindrome
• Valid Anagram
• 3Sum
• Random Pick with Weight
• Text Justification
• Container With Most Water
• Sliding Window Maximum
• Flood Fill
• Linked List Cycle
• Minimum Window Substring
• Longest Substring Without Repeating Characters
• Reverse Linked List
• Middle of the Linked List
• Array.prototype.flat()
• Array.prototype.forEach()
• Array.prototype.map()
• Array.prototype.reduce()
• Convert Hex Color to RGBA
• Currying
• Debounce
• Event Emitter
• Find Next Right Sibling
• Invert Binary Tree
• Previous Left Sibling
• Roman Numerals to Integer
• Serialize and Deserialize Binary Tree
• Throttle
• Traverse DOM Level by Level (Flatten)
• Virtual DOM
• Remove K Digits
• Contains Duplicate
• Missing Number
• Find All Numbers Disappeared in an Array
• Single Number
• Convert 1D Array into 2D Array
• Product of Array Except Self
• Find the Duplicate Number
• Find All Duplicates in an Array
• Set Matrix Zeroes
• Spiral Matrix
• Data Fetching Histogram
• Rotate Image
• Longest Consecutive Sequence
• First Missing Positive
• Climbing Stairs
• Maximum Subarray
• Range Sum Query - Immutable
• Counting Bits
• Image Carousel
• Snake
• Modal Overlay
• Target Sum
• House Robber
• Mortgage Calculator
• Trapping Rain Water
• Coin Change
• Maximum Product Subarray
• Longest Increasing Subsequence
• Longest Palindromic Substring
• Word Break
• Combination Sum IV
• Decode Ways
• Unique Paths
• Number of Longest Increasing Subsequence
• Palindromic Substrings
• Jump Game
• Partition Equal Subset Sum
• Partition to K Equal Sum Subsets
• Binary Search
• sqrt(x)
• Peak Index in a Mountain Array
• Find Peak Element
• Find Minimum in Rotated Sorted Array
• Search a 2D Matrix
• Maximum Depth of Binary Tree
• Same Tree
• Diameter of Binary Tree
• Lowest Common Ancestor of a Binary Search Tree
• Lowest Common Ancestor of a Binary Tree
• Balanced Binary Tree
• Longest Substring with at Most Two Distinct Characters
• Validate Binary Search Tree
• Insert into a Binary Search Tree
• Permutations
• Path Sum
• Path Sum II
• Path Sum III
• Course Schedule
• Course Schedule II
• Clone Graph
• Pacific Atlantic Water Flow
• Graph Valid Tree
• Word Search
• Word Search II
• Implement Trie Prefix Tree
• Design Search Autocomplete System
• Reverse Polish Notation
• Letter Combinations of a Phone Number
• Maximum Width of Binary Tree
• Binary Tree Maximum Path Sum
• Subsets
• Find Leaves of Binary Tree
• Find Duplicate Subtrees
• Combinations
• Combination Sum
• Combination Sum II
• Combination Sum III
• Palindrome Partitioning
• Strobogrammatic Number II
• Generate Parentheses
• Generalized Abbreviation
• Sudoku Solver
• Meeting Rooms
• Meeting Rooms II
• Binary Tree Level Order Traversal
• Binary Tree Zigzag Level Order Traversal
• Kth Smallest Element in a Sorted Matrix
• Kth Largest Element in an Array
• Median of Two Sorted Arrays
• Insert Interval
• Merge Intervals
• 01 Matrix
• Shortest Path in a Grid with Obstacles Elimination
• Remove nth Node from End of List
• Alien Dictionary
• Build Text File Folder Structure UI
• Logger Rate Limiter
• Design Hit Counter
• Race Car
• Longest Increasing Path in a Matrix
• Find Median from Data Stream
• Step by Step Directions from a Binary Tree Node to Another
• Employee Free Time
• Robot Room Cleaner
• Battleships in a Board
• Subtree of Another Tree
• Construct Binary Tree from Preorder and Inorder Traversal
• Convert Sorted Array to Binary Search Tree
• Task Scheduler
• Interval List Intersections
• Rotting Oranges
• Longest String Chain
• Minimum Size Subarray Sum
• Permutation in String
• Decode String
• Time Based Key Value Store
• Accounts Merge