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A curated List of Coding Questions Asked in FAANG Interviews

Coding Interview Questions

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Interview Questions

Table of Contents

SNo. Contents
1. FAANG Must Do Problems
2. Amazon
3. Microsoft
4. Facebook
5. Google Top 50
6. Google
7. LinkedIn
8. Flipkart
9. Netflix

  1. FAANG Must Do Problems

No. Questions
1 Two Sum
2 Longest Substring Without Repeating Characters
3 Longest Palindromic Substring
4 Container With Most Water
5 3Sum
6 Remove Nth Node From End of List
7 Valid Parentheses
8 Merge Two Sorted Lists
9 Merge k Sorted Lists
10 Search in Rotated Sorted Array
11 Combination Sum
12 Rotate Image
13 Group Anagrams
14 Maximum Subarray
15 Spiral Matrix
16 Jump Game
17 Merge Intervals
18 Insert Interval
19 Unique Paths
20 Climbing Stairs
21 Set Matrix Zeroes
22 Minimum Window Substring
23 Word Search
24 Decode Ways
25 Validate Binary Search Tree
26 Same Tree
27 Binary Tree Level Order Traversal
28 Maximum Depth of Binary Tree
29 Construct Binary Tree from Preorder and Inorder Traversal
30 Best Time to Buy and Sell Stock
31 Binary Tree Maximum Path Sum
32 Valid Palindrome
33 Longest Consecutive Sequence
34 Clone Graph
35 Word Break
36 Linked List Cycle
37 Reorder List
38 Maximum Product Subarray
39 Find Minimum in Rotated Sorted Array
40 Reverse Bits
41 Number of 1 Bits
42 House Robber
43 Number of Islands
44 Reverse Linked List
45 Course Schedule
46 Implement Trie (Prefix Tree)
47 Design Add and Search Words Data Structure
48 Word Search II
49 House Robber II
50 Contains Duplicate
51 Invert Binary Tree
52 Kth Smallest Element in a BST
53 Lowest Common Ancestor of a Binary Search Tree
54 Lowest Common Ancestor of a Binary Tree
55 Product of Array Except Self
56 Valid Anagram
57 Meeting Rooms
58 Meeting Rooms II
59 Graph Valid Tree
60 Missing Number
61 Alien Dictionary
62 Encode and Decode Strings
63 Find Median from Data Stream
64 Longest Increasing Subsequence
65 Coin Change
66 Number of Connected Components in an Undirected Graph
67 Counting Bits
68 Top K Frequent Elements
69 Sum of Two Integers
70 Pacific Atlantic Water Flow
71 Longest Repeating Character Replacement
72 Non-overlapping Intervals
73 Serialize and Deserialize BST
74 Subtree of Another Tree
75 Palindromic Substrings
76 Longest Common Subsequence
77 Find the Duplicate Number

  1. Amazon

No. Questions
1 Two Sum
2 Add Two Numbers
3 Longest Substring Without Repeating Characters
4 Median of Two Sorted Arrays
5 Longest Palindromic Substring
6 ZigZag Conversion
7 String to Integer (atoi)
8 3Sum
9 Letter Combinations of a Phone Number
10 Valid Parentheses
11 Merge Two Sorted Lists
12 Generate Parentheses
13 Merge k Sorted Lists
14 Trapping Rain Water
15 Permutations
16 Rotate Image
17 Group Anagrams
18 Merge Intervals
19 Spiral Matrix II
20 Unique Paths II
21 Minimum Path Sum
22 Edit Distance
23 Set Matrix Zeroes
24 Sort Colors
25 Minimum Window Substring
26 Subsets
27 Gray Code
28 Validate Binary Search Tree
29 Same Tree
30 Binary Tree Level Order Traversal
31 Path Sum II
32 Pascal's Triangle II
33 Best Time to Buy and Sell Stock
34 Word Ladder II
35 Word Ladder
36 Sum Root to Leaf Numbers
37 Copy List with Random Pointer
38 Word Break
39 Linked List Cycle
40 LRU Cache
41 Sort List
42 Min Stack
43 Intersection of Two Linked Lists
44 Two Sum II - Input array is sorted
45 Binary Search Tree Iterator
46 Rotate Array
47 Binary Tree Right Side View
48 Number of Islands
49 Happy Number
50 Count Primes
51 Reverse Linked List
52 Word Search II
53 Kth Largest Element in an Array
54 Basic Calculator
55 Palindrome Linked List
56 Lowest Common Ancestor of a Binary Search Tree
57 Lowest Common Ancestor of a Binary Tree
58 Product of Array Except Self
59 Sliding Window Maximum
60 Search a 2D Matrix II
61 Valid Anagram
62 Find Median from Data Stream
63 Serialize and Deserialize Binary Tree
64 Top K Frequent Elements
65 Design Twitter
66 Insert Delete GetRandom O(1)
67 Shuffle an Array
68 First Unique Character in a String
69 Rotate Function
70 Third Maximum Number
71 Battleships in a Board
72 Find All Anagrams in a String
73 String Compression
74 Serialize and Deserialize BST
75 Sort Characters By Frequency
76 Repeated Substring Pattern
77 LFU Cache
78 Concatenated Words
79 Most Frequent Subtree Sum
80 Longest Palindromic Subsequence
81 Super Washing Machines
82 Minesweeper
83 K-diff Pairs in an Array
84 Encode and Decode TinyURL
85 Complex Number Multiplication
86 Convert BST to Greater Tree
87 01 Matrix
88 Optimal Division
89 Subarray Sum Equals K
90 Subtree of Another Tree
91 Shortest Unsorted Continuous Subarray
92 Construct String from Binary Tree
93 Merge Two Binary Trees
94 Solve the Equation
95 Set Mismatch
96 Maximum Length of Pair Chain
97 Image Smoother
98 Maximum Width of Binary Tree
99 Cut Off Trees for Golf Event
100 Baseball Game
101 Top K Frequent Words
102 Accounts Merge
103 Find Pivot Index
104 Split Linked List in Parts
105 Monotone Increasing Digits
106 Min Cost Climbing Stairs
107 Prime Number of Set Bits in Binary Representation
108 Partition Labels
109 Reorganize String
110 Global and Local Inversions
111 Most Common Word
112 Unique Email Addresses
113 Knight Dialer
114 Reorder Data in Log Files
115 Prison Cells After N Days
116 K Closest Points to Origin
117 Subarrays with K Different Integers
118 Rotting Oranges
119 Binary Search Tree to Greater Sum Tree
120 Distant Barcodes
121 Sum of Nodes with Even-Valued Grandparent
122 Number of Dice Rolls With Target Sum
123 Critical Connections in a Network
124 Search Suggestions System
125 Number of Steps to Reduce a Number to Zero
126 Stone Game III

  1. Microsoft

No. Questions
1 Two Sum
2 Add Two Numbers
3 Median of Two Sorted Arrays
4 Longest Palindromic Substring
5 String to Integer (atoi)
6 Roman to Integer
7 3Sum
8 Valid Parentheses
9 Merge Two Sorted Lists
10 Merge k Sorted Lists
11 Swap Nodes in Pairs
12 Reverse Nodes in k-Group
13 Remove Duplicates from Sorted Array
14 Implement strStr()
15 Search in Rotated Sorted Array
16 Maximum Subarray
17 Spiral Matrix
18 Jump Game
19 Merge Intervals
20 Binary Tree Maximum Path Sum
21 Valid Palindrome
22 Copy List with Random Pointer
23 Linked List Cycle
24 LRU Cache
25 Reverse Words in a String
26 Find Minimum in Rotated Sorted Array
27 Find Peak Element
28 Excel Sheet Column Title
29 Excel Sheet Column Number
30 Binary Search Tree Iterator
31 Rotate Array
32 Number of 1 Bits
33 Number of Islands
34 Reverse Linked List
35 Implement Trie (Prefix Tree)
36 Word Search II
37 Kth Largest Element in an Array
38 The Skyline Problem
39 Delete Node in a Linked List
40 Product of Array Except Self
41 Add Digits
42 Missing Number
43 Serialize and Deserialize Binary Tree
44 First Unique Character in a String
45 Arithmetic Slices
46 String Compression
47 Max Chunks To Make Sorted
48 Valid Tic-Tac-Toe State
49 Maximum Length of a Concatenated String with Unique Characters
50 Find N Unique Integers Sum up to Zero
51 Jump Game III
52 Cinema Seat Allocation
53 Bulb Switcher III

  1. Facebook

No. Questions
1 Regular Expression Matching
2 Roman to Integer
3 3Sum
4 Letter Combinations of a Phone Number
5 Valid Parentheses
6 Merge k Sorted Lists
7 Reverse Nodes in k-Group
8 Remove Duplicates from Sorted Array
9 Implement strStr()
10 Search in Rotated Sorted Array
11 Count and Say
12 Wildcard Matching
13 Pow(x, n)
14 Merge Intervals
15 Insert Interval
16 Valid Palindrome
17 Longest Consecutive Sequence
18 Clone Graph
19 Word Break
20 LRU Cache
21 Binary Search Tree Iterator
22 Number of Islands
23 Implement Trie (Prefix Tree)
24 Kth Largest Element in an Array
25 The Skyline Problem
26 Maximal Square
27 Binary Tree Paths
28 H-Index
29 Expression Add Operators
30 Serialize and Deserialize Binary Tree
31 Flatten Nested List Iterator
32 Combination Sum IV
33 Insert Delete GetRandom O(1)
34 Target Sum
35 Encode and Decode TinyURL
36 Diameter of Binary Tree
37 Valid Palindrome II
38 Maximum Sum of 3 Non-Overlapping Subarrays
39 Sudoku Solver
40 Maximum Subarray
41 Valid Number
42 Plus One
43 Add Binary
44 Is Graph Bipartite?
45 Custom Sort String
46 Smallest Subtree with all the Deepest Nodes
47 Shortest Bridge
48 Range Sum of BST
49 Verifying an Alien Dictionary
50 K Closest Points to Origin
51 Interval List Intersections
52 Max Consecutive Ones III
53 Minimum Remove to Make Valid Parentheses
54 Merge Sorted Array
55 Binary Tree Level Order Traversal
56 Best Time to Buy and Sell Stock
57 Best Time to Buy and Sell Stock III
58 Best Time to Buy and Sell Stock IV
59 Binary Tree Maximum Path Sum
60 Fraction to Recurring Decimal
61 Simplify Path
62 Minimum Window Substring
63 Course Schedule
64 Design Add and Search Words Data Structure
65 Kth Smallest Element in a BST
66 Lowest Common Ancestor of a Binary Tree
67 Product of Array Except Self
68 Exclusive Time of Functions
69 First Bad Version
70 Move Zeroes
71 Task Scheduler
72 Remove Invalid Parentheses
73 Longest Increasing Path in a Matrix
74 Search in Rotated Sorted Array II
75 Convert a Number to Hexadecimal
76 Add Strings
77 Partition Equal Subset Sum
78 Find All Anagrams in a String
79 Continuous Subarray Sum
80 Subarray Sum Equals K

  1. Google Top 50

No. Questions
1 Two Sum
2 Insert Interval
3 Text Justification
4 Minimum Window Substring
5 Maximal Rectangle
6 The Skyline Problem
7 Maximal Square
8 Find Median from Data Stream
9 Bulls and Cows
10 Count of Smaller Numbers After Self
11 Longest Increasing Path in a Matrix
12 Max Sum of Rectangle No Larger Than K
13 Decode String
14 Evaluate Division
15 Split Array Largest Sum
16 Subarray Sum Equals K
17 Split Array into Consecutive Subsequences
18 24 Game
19 Network Delay Time
20 Open the Lock
21 Expressive Words
22 Find And Replace in String
23 Guess the Word
24 Hand of Straights
25 Shortest Subarray with Sum at Least K
26 Random Pick with Weight
27 X of a Kind in a Deck of Cards
28 Minimum Area Rectangle
29 Validate Stack Sequences
30 Flip Equivalent Binary Trees
31 Minimum Domino Rotations For Equal Row
32 Longest String Chain
33 Delete Nodes And Return Forest
34 Snapshot Array
35 Divide Array in Sets of K Consecutive Numbers
36 Minimum Distance to Type a Word Using Two Fingers
37 Time Needed to Inform All Employees

  1. Google

No. Questions
1 Two Sum
2 Median of Two Sorted Arrays
3 Regular Expression Matching
4 Letter Combinations of a Phone Number
5 Valid Parentheses
6 Generate Parentheses
7 Merge k Sorted Lists
8 Remove Duplicates from Sorted Array
9 Next Permutation
10 Trapping Rain Water
11 Wildcard Matching
12 Pow(x, n)
13 Spiral Matrix
14 Merge Intervals
15 Insert Interval
16 Plus One
17 Maximal Rectangle
18 Same Tree
19 Pascal's Triangle
20 Word Ladder
21 Longest Consecutive Sequence
22 Clone Graph
23 Word Break
24 Word Break II
25 LRU Cache
26 Min Stack
27 Find Peak Element
28 Fraction to Recurring Decimal
29 Binary Search Tree Iterator
30 House Robber
31 Number of Islands
32 Isomorphic Strings
33 Implement Trie (Prefix Tree)
34 Word Search II
35 Shortest Palindrome
36 The Skyline Problem
37 Count Complete Tree Nodes
38 Basic Calculator
39 Summary Ranges
40 Kth Smallest Element in a BST
41 Power of Two
42 Product of Array Except Self
43 Sliding Window Maximum
44 Search a 2D Matrix II
45 Binary Tree Paths
46 H-Index
47 Perfect Squares
48 Expression Add Operators
49 Move Zeroes
50 Peeking Iterator
51 Game of Life
52 Find Median from Data Stream
53 Serialize and Deserialize Binary Tree
54 Bulls and Cows
55 Longest Increasing Subsequence
56 Best Time to Buy and Sell Stock with Cooldown
57 Minimum Height Trees
58 Burst Balloons
59 Super Ugly Number
60 Count of Smaller Numbers After Self
61 Remove Duplicate Letters
62 Maximum Product of Word Lengths
63 Create Maximum Number
64 Wiggle Sort II
65 Power of Three
66 Count of Range Sum
67 Longest Increasing Path in a Matrix
68 Patching Array
69 Verify Preorder Serialization of a Binary Tree
70 Reconstruct Itinerary
71 Palindrome Pairs
72 Flatten Nested List Iterator
73 Reverse Vowels of a String
74 Russian Doll Envelopes
75 Count Numbers with Unique Digits
76 Max Sum of Rectangle No Larger Than K
77 Find K Pairs with Smallest Sums
78 Guess Number Higher or Lower
79 Guess Number Higher or Lower II
80 Combination Sum IV
81 Kth Smallest Element in a Sorted Matrix
82 Insert Delete GetRandom O(1)
83 Linked List Random Node
84 First Unique Character in a String
85 Longest Absolute File Path
86 Find the Difference
87 Perfect Rectangle
88 UTF-8 Validation
89 Decode String
90 Integer Replacement
91 Evaluate Division
92 Nth Digit
93 Binary Watch
94 Remove K Digits
95 Queue Reconstruction by Height
96 Trapping Rain Water II
97 Longest Palindrome
98 Split Array Largest Sum
99 Add Strings
100 Pacific Atlantic Water Flow
101 Maximum XOR of Two Numbers in an Array
102 Number of Boomerangs
103 Find All Numbers Disappeared in an Array
104 Sort Characters By Frequency
105 Repeated Substring Pattern
106 LFU Cache
107 Island Perimeter
108 Ones and Zeroes
109 Heaters
110 Sliding Window Median
111 Magical String
112 License Key Formatting
113 Smallest Good Base
114 Max Consecutive Ones
115 Predict the Winner
116 Reverse Pairs
117 Target Sum
118 Diagonal Traverse
119 Find Mode in Binary Search Tree
120 Next Greater Element II
121 Relative Ranks
122 Freedom Trail
123 Longest Palindromic Subsequence
124 Detect Capital
125 Longest Uncommon Subsequence I
126 Longest Uncommon Subsequence II
127 Longest Word in Dictionary through Deleting
128 Beautiful Arrangement
129 Minimum Absolute Difference in BST
130 Encode and Decode TinyURL
131 Reverse String II
132 01 Matrix
133 Diameter of Binary Tree
134 Student Attendance Record I
135 Student Attendance Record II
136 Subarray Sum Equals K
137 Shortest Unsorted Continuous Subarray
138 Delete Operation for Two Strings
139 Erect the Fence
140 Smallest Range Covering Elements from K Lists
141 Shopping Offers
142 Maximum Average Subarray I
143 Find Duplicate Subtrees
144 Find K Closest Elements
145 Split Array into Consecutive Subsequences
146 Non-decreasing Array
147 Beautiful Arrangement II
148 Kth Smallest Number in Multiplication Table
149 Implement Magic Dictionary
150 Valid Parenthesis String
151 24 Game
152 Redundant Connection
153 Redundant Connection II
154 Repeated String Match
155 Longest Univalue Path
156 Maximum Sum of 3 Non-Overlapping Subarrays
157 Find K-th Smallest Pair Distance
158 Number of Atoms
159 My Calendar I
160 My Calendar II
161 My Calendar III
162 Daily Temperatures
163 Largest Number At Least Twice of Others
164 Shortest Completing Word
165 Open the Lock
166 Cracking the Safe
167 Pyramid Transition Matrix
168 Couples Holding Hands
169 Toeplitz Matrix
170 Number of Matching Subsequences
171 Minimum Swaps To Make Sequences Increasing
172 Backspace String Compare
173 Maximize Distance to Closest Person
174 All Possible Full Binary Trees
175 Fruit Into Baskets
176 Long Pressed Name
177 Unique Email Addresses
178 Knight Dialer
179 Minimum Area Rectangle
180 K Closest Points to Origin
181 Odd Even Jump
182 Shortest Way to Form String
183 Campus Bikes
184 Confusing Number II
185 Video Stitching
186 Stream of Characters
187 Maximum Level Sum of a Binary Tree
188 String Transforms Into Another String
189 Number of Submatrices That Sum to Target
190 Divide Chocolate
191 Delete Nodes And Return Forest
192 Compare Strings by Frequency of the Smallest Character
193 Tiling a Rectangle with the Fewest Squares
194 Count Number of Nice Subarrays

  1. LinkedIn

No. Questions
1 Nested List Weight Sum II
2 Shortest Word Distance II
3 Closest Binary Search Tree Value II
4 Two Sum III - Data structure design
5 Nested List Weight Sum
6 Max Stack
7 Find Leaves of Binary Tree
8 All O'one Data Structure
9 Can Place Flowers
10 Factor Combinations
11 Paint House
12 Paint House II
13 Evaluate Reverse Polish Notation
14 Shortest Word Distance
15 Text Justification
16 Count Different Palindromic Subsequences
17 Binary Tree Upside Down
18 Max Points on a Line
19 Partition to K Equal Sum Subsets
20 Insert Delete GetRandom O(1)
21 Number of Islands
22 Exclusive Time of Functions
23 Valid Triangle Number
24 Valid Number
25 Repeated DNA Sequences

  1. Flipkart

No. Questions
1 Add Two Numbers

  1. Netflix

No. Questions
1 LRU Cache
2 Department Top Three Salaries

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A curated List of Coding Questions Asked in FAANG Interviews

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