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Math Interview Questions

Master 516 math problems frequently asked in technical interviews. These questions test your understanding of mathconcepts and are essential for coding interview success.

516

Total Problems

136

Easy

252

Medium

128

Hard

Related Topics

Array Dynamic Programming String Hash Table Number Theory Greedy Sorting Bit Manipulation

#227MediumFrequency: 89.3%

Basic Calculator II

Math String Stack

#1

Rank

#912MediumFrequency: 87.7%

Random Pick with Weight

Array Math Binary Search Prefix Sum Randomized

#2

Rank

#50MediumFrequency: 84.1%

Pow(x, n)

#3

Rank

#2MediumFrequency: 81.4%

Add Two Numbers

Asked at Microsoft

Linked List Math Recursion

#4

Rank

#564HardFrequency: 80.8%

Find the Closest Palindrome

#5

Rank

#189MediumFrequency: 78.2%

Rotate Array

Array Math Two Pointers

#6

Rank

#1014MediumFrequency: 77.1%

K Closest Points to Origin

Array Math Divide and Conquer Geometry Sorting Heap (Priority Queue)Quickselect K-D Tree

#7

Rank

#9EasyFrequency: 76.9%

Palindrome Number

Asked at Infosys

#8

Rank

#3608HardFrequency: 76.9%

Find the Number of Subsequences With Equal GCD

Asked at Infosys

Array Math Dynamic Programming Number Theory Euclidean Algorithm Greatest Common Divisor

#9

Rank

#2147HardFrequency: 76.6%

The Score of Students Solving Math Expression

Asked at Flipkart

Array Hash Table Math String Dynamic Programming Stack Memoization

#10

Rank

#3994EasyFrequency: 76.6%

Find The Least Frequent Digit

Asked at Flipkart

Array Hash Table Math Counting

#11

Rank

#380MediumFrequency: 76.2%

Insert Delete GetRandom O(1)

Array Hash Table Math Design Randomized

#12

Rank

#2667HardFrequency: 76%

Maximum Frequency Score of a Subarray

Asked at PayPal

Array Hash Table Math Stack Sliding Window

#13

Rank

#2100MediumFrequency: 73.2%

Minimum Non-Zero Product of the Array Elements

Asked at PayPal

Math Greedy Recursion

#14

Rank

#2141MediumFrequency: 73.2%

Smallest Greater Multiple Made of Two Digits

Asked at PayPal

Math Enumeration

#15

Rank

#2301HardFrequency: 73.2%

Count Array Pairs Divisible by K

Asked at PayPal

Array Hash Table Math Counting Number Theory Euclidean Algorithm Greatest Common Divisor

#16

Rank

#670MediumFrequency: 71.7%

Maximum Swap

#17

Rank

#13EasyFrequency: 69.2%

Roman to Integer

Asked at Microsoft

Hash Table Math String

#18

Rank

#628EasyFrequency: 67.8%

Maximum Product of Three Numbers

Asked at Salesforce

Array Math Sorting

#19

Rank

#70EasyFrequency: 67.6%

Climbing Stairs

Asked at Infosys

Math Dynamic Programming Memoization

#20

Rank

#2415HardFrequency: 67.6%

Count the Number of Ideal Arrays

Asked at Infosys

Math Dynamic Programming Combinatorics Number Theory Prime Factorization Fermat's Little Theorem

#21

Rank

#4215HardFrequency: 67.6%

Good Subsequence Queries

Asked at Infosys

Array Math Segment Tree Number Theory

#22

Rank

#69EasyFrequency: 66.8%

Sqrt(x)

Asked at TikTok

Math Binary Search Newton's Method

#23

Rank

#785HardFrequency: 66.8%

Basic Calculator III

Asked at TikTok

Math String Stack Recursion

#24

Rank

#1929MediumFrequency: 66.8%

Maximum Value at a Given Index in a Bounded Array

Asked at TikTok

Math Binary Search Greedy

#25

Rank

#48MediumFrequency: 66.7%

Rotate Image

Asked at Microsoft

Array Math Matrix

#26

Rank

#360MediumFrequency: 66.5%

Sort Transformed Array

Asked at LinkedIn

Array Math Two Pointers Sorting

#27

Rank

#7MediumFrequency: 66%

Reverse Integer

#28

Rank

#1053MediumFrequency: 65.5%

Minimize Rounding Error to Meet Target

Asked at Airbnb

Array Math String Greedy Sorting

#29

Rank

#1070MediumFrequency: 65.5%

Convert to Base -2

Asked at Airbnb

#30

Rank

#202EasyFrequency: 65.5%

Happy Number

Asked at Airbnb

Hash Table Math Two Pointers Floyd's Cycle Finding Algorithm

#31

Rank

#1385MediumFrequency: 65.5%

Number of Ways to Build House of Cards

Asked at Airbnb

Math Dynamic Programming

#32

Rank

#415EasyFrequency: 65.5%

Add Strings

Asked at Airbnb

Math String Simulation

#33

Rank

#1119MediumFrequency: 65.5%

Robot Bounded In Circle

Asked at Airbnb

Math String Simulation

#34

Rank

#2002HardFrequency: 65.2%

Stone Game VIII

Asked at Infosys

Array Math Dynamic Programming Minimax Prefix Sum Game Theory Zero-Sum Game

#35

Rank

#4274HardFrequency: 65.2%

Maximum Total Value

Asked at Infosys

Array Math Binary Search Greedy

#36

Rank

#319MediumFrequency: 65%

Bulb Switcher

Asked at LinkedIn

Math Brainteaser

#37

Rank

#556MediumFrequency: 64.6%

Next Greater Element III

Asked at DoorDash

Math Two Pointers String

#38

Rank

#2544MediumFrequency: 62.5%

Minimum Addition to Make Integer Beautiful

Asked at Infosys

#39

Rank

#2696MediumFrequency: 62.5%

The Number of Beautiful Subsets

Asked at Infosys

Array Hash Table Math Dynamic Programming Backtracking Sorting Combinatorics

#40

Rank

#2811MediumFrequency: 62.5%

Determine the Minimum Sum of a k-avoiding Array

Asked at Infosys

#41

Rank

#3017HardFrequency: 62.5%

Number of Beautiful Integers in the Range

Asked at Infosys

Math Dynamic Programming

#42

Rank

#3026MediumFrequency: 62.5%

Find the Minimum Possible Sum of a Beautiful Array

Asked at Infosys

#43

Rank

#3989HardFrequency: 62.5%

Sum of Beautiful Subsequences

Asked at Infosys

Array Math Binary Indexed Tree Number Theory

#44

Rank

#224HardFrequency: 61.8%

Basic Calculator

Math String Stack Recursion

#45

Rank

#62MediumFrequency: 61.4%

Unique Paths

Asked at Amazon

Math Dynamic Programming Combinatorics

#46

Rank

#523MediumFrequency: 59.8%

Continuous Subarray Sum

Array Hash Table Math Prefix Sum Pigeonhole Principle

#47

Rank

#381HardFrequency: 59.7%

Insert Delete GetRandom O(1) - Duplicates allowed

Asked at LinkedIn

Array Hash Table Math Design Randomized

#48

Rank

#1013EasyFrequency: 59.4%

Fibonacci Number

Asked at Infosys

Math Dynamic Programming Recursion Memoization

#49

Rank

#398MediumFrequency: 59.1%

Random Pick Index

Hash Table Math Reservoir Sampling Randomized

#50

Rank

#282HardFrequency: 58.8%

Expression Add Operators

Math String Backtracking

#51

Rank

#2383EasyFrequency: 58.5%

Add Two Integers

Asked at Google

#52

Rank

#149HardFrequency: 56.3%

Max Points on a Line

Asked at LinkedIn

Array Hash Table Math Geometry Euclidean Algorithm Greatest Common Divisor

#53

Rank

#384MediumFrequency: 55.9%

Shuffle an Array

Array Math Design Randomized

#54

Rank

#66EasyFrequency: 55.3%

Plus One

Asked at Google

#55

Rank

#3215EasyFrequency: 55.1%

Matrix Similarity After Cyclic Shifts

Asked at Salesforce

Array Math Matrix Simulation

#56

Rank

#3294MediumFrequency: 55.1%

Number of Self-Divisible Permutations

Asked at Salesforce

Array Math Dynamic Programming Backtracking Bit Manipulation Number Theory Bitmask

#57

Rank

#268EasyFrequency: 54.4%

Missing Number

Asked at Amazon

Array Hash Table Math Binary Search Bit Manipulation Sorting

#58

Rank

#2610MediumFrequency: 54.4%

Closest Prime Numbers in Range

Asked at TikTok

Math Number Theory Primality Test Sieve Theory Prime Number Sieve

#59

Rank

#1971MediumFrequency: 54.4%

Incremental Memory Leak

Asked at TikTok

Math Simulation

#60

Rank

#367EasyFrequency: 53.7%

Valid Perfect Square

Asked at LinkedIn

Math Binary Search

#61

Rank

#464MediumFrequency: 53.7%

Can I Win

Asked at LinkedIn

Math Dynamic Programming Bit Manipulation Memoization Game Theory Bitmask

#62

Rank

#67EasyFrequency: 53.4%

Add Binary

Asked at Google

Math String Bit Manipulation Simulation

#63

Rank

#231EasyFrequency: 53.4%

Power of Two

Asked at Google

Math Bit Manipulation Recursion

#64

Rank

#2679EasyFrequency: 53.4%

Count Distinct Numbers on Board

Asked at Oracle

Array Hash Table Math Simulation

#65

Rank

#3244MediumFrequency: 53.4%

Minimize Length of Array Using Operations

Asked at Oracle

Array Math Greedy Number Theory

#66

Rank

#1732HardFrequency: 53.4%

Minimum One Bit Operations to Make Integers Zero

Asked at Oracle

Math Dynamic Programming Bit Manipulation Recursion Memoization

#67

Rank

#1461HardFrequency: 53.4%

Count All Valid Pickup and Delivery Options

Asked at DoorDash

Math Dynamic Programming Combinatorics

#68

Rank

#976MediumFrequency: 52.9%

Minimum Area Rectangle

Asked at Flipkart

Array Hash Table Math Geometry Sorting

#69

Rank

#12MediumFrequency: 52.8%

Integer to Roman

Asked at Microsoft

Hash Table Math String

#70

Rank

#273HardFrequency: 52.8%

Integer to English Words

Asked at Microsoft

Math String Recursion

#71

Rank

#3277HardFrequency: 52.1%

Find the Number of Ways to Place People II

Array Math Geometry Sorting Enumeration

#72

Rank

#1146EasyFrequency: 51.4%

Greatest Common Divisor of Strings

Asked at TikTok

Math String Euclidean Algorithm Greatest Common Divisor

#73

Rank

#1038HardFrequency: 51%

Number of Squareful Arrays

Array Hash Table Math Dynamic Programming Backtracking Bit Manipulation Bitmask

#74

Rank

#150MediumFrequency: 50.6%

Evaluate Reverse Polish Notation

Asked at LinkedIn

Array Math Stack

#75

Rank

#3224HardFrequency: 50.6%

Count the Number of Infection Sequences

Asked at Oracle

Array Math Combinatorics Fermat's Little Theorem

#76

Rank

#796HardFrequency: 50.3%

Reaching Points

Asked at PayPal

Math Euclidean Algorithm Greatest Common Divisor

#77

Rank

#171EasyFrequency: 49.9%

Excel Sheet Column Number

#78

Rank

#43MediumFrequency: 49.3%

Multiply Strings

Math String Simulation

#79

Rank

#3897HardFrequency: 48.8%

Count Number of Trapezoids II

Asked at Google

Array Hash Table Math Geometry

#80

Rank

#365MediumFrequency: 48%

Water and Jug Problem

Asked at TikTok

Math Depth-First Search Breadth-First Search Bézout's Lemma Euclidean Algorithm Greatest Common Divisor Extended Euclidean Algorithm

#81

Rank

#923HardFrequency: 48%

Super Egg Drop

Asked at TikTok

Math Binary Search Dynamic Programming

#82

Rank

#894HardFrequency: 47.5%

Random Pick with Blacklist

Array Hash Table Math Binary Search Sorting Randomized

#83

Rank

#3198HardFrequency: 47.5%

Number of Ways to Reach Destination in the Grid

Math Dynamic Programming Combinatorics

#84

Rank

#168EasyFrequency: 47.3%

Excel Sheet Column Title

Asked at Microsoft

#85

Rank

#204MediumFrequency: 47.3%

Count Primes

Asked at Microsoft

Array Math Enumeration Number Theory Primality Test Sieve Theory Prime Number Sieve

#86

Rank

#29MediumFrequency: 45%

Divide Two Integers

Asked at Microsoft

Math Bit Manipulation

#87

Rank

#2423HardFrequency: 44.7%

Minimum Deletions to Make Array Divisible

Asked at LinkedIn

Array Math Sorting Heap (Priority Queue)Number Theory Euclidean Algorithm Greatest Common Divisor

#88

Rank

#633MediumFrequency: 44.7%

Sum of Square Numbers

Asked at LinkedIn

Math Two Pointers Binary Search

#89

Rank

#1693EasyFrequency: 44.7%

Sum of All Odd Length Subarrays

Asked at LinkedIn

Array Math Prefix Sum

#90

Rank

#4065HardFrequency: 44.7%

Count Sequences to K

Asked at LinkedIn

Array Math Dynamic Programming Memoization Number Theory

#91

Rank

#3886MediumFrequency: 44.6%

Count Number of Trapezoids I

Asked at Google

Array Hash Table Math Geometry

#92

Rank

#4048MediumFrequency: 44.6%

Minimum Time to Complete All Deliveries

Asked at Amazon

Math Binary Search

#93

Rank

#873HardFrequency: 44.3%

Guess the Word

Asked at Google

Array Math String Minimax Interactive Game Theory

#94

Rank

#938HardFrequency: 44%

Numbers At Most N Given Digit Set

Asked at TikTok

Array Math String Binary Search Dynamic Programming

#95

Rank

#1370MediumFrequency: 44%

Count Number of Nice Subarrays

Asked at TikTok

Array Hash Table Math Sliding Window Prefix Sum

#96

Rank

#1951MediumFrequency: 43.7%

Find the Winner of the Circular Game

Asked at Oracle

Array Math Recursion Queue Simulation

#97

Rank

#856HardFrequency: 43.7%

Consecutive Numbers Sum

Asked at Oracle

Math Enumeration

#98

Rank

#1585MediumFrequency: 43.6%

The kth Factor of n

Asked at Amazon

Math Number Theory Prime Factorization

#99

Rank

#258EasyFrequency: 43.3%

Add Digits

Asked at Microsoft

Math Simulation Number Theory

#100

Rank

#2867MediumFrequency: 43.2%

Ways to Split Array Into Good Subarrays

Asked at Flipkart

Array Math Dynamic Programming

#101

Rank

#296HardFrequency: 43.1%

Best Meeting Point

Asked at DoorDash

Array Math Sorting Matrix

#102

Rank

#326EasyFrequency: 42%

Power of Three

Asked at Google

#103

Rank

#412EasyFrequency: 42%

Fizz Buzz

Asked at Amazon

Math String Simulation

#104

Rank

#233HardFrequency: 41.2%

Number of Digit One

Asked at Salesforce

Math Dynamic Programming Recursion

#105

Rank

#2450HardFrequency: 41.2%

Minimum Replacements to Sort the Array

Asked at Salesforce

Array Math Greedy

#106

Rank

#2324MediumFrequency: 40.8%

Find Triangular Sum of an Array

Asked at Amazon

Array Math Simulation Combinatorics Number Theory

#107

Rank

#368MediumFrequency: 39.5%

Largest Divisible Subset

Asked at Google

Array Math Dynamic Programming Sorting

#108

Rank

#2663EasyFrequency: 39.4%

Distribute Money to Maximum Children

#109

Rank

#477MediumFrequency: 39.4%

Total Hamming Distance

Array Math Bit Manipulation

#110

Rank

#650MediumFrequency: 39.1%

2 Keys Keyboard

Asked at TikTok

Math Dynamic Programming

#111

Rank

#679HardFrequency: 39%

24 Game

Asked at Google

Array Math Backtracking

#112

Rank

#2050MediumFrequency: 38.9%

Count Good Numbers

Asked at Amazon

#113

Rank

#279MediumFrequency: 38.2%

Perfect Squares

Asked at Google

Math Dynamic Programming Breadth-First Search Knapsack Problem Complete Knapsack

#114

Rank

#3227EasyFrequency: 38.2%

Find Missing and Repeated Values

Asked at Google

Array Hash Table Math Matrix

#115

Rank

#445MediumFrequency: 38.2%

Add Two Numbers II

Asked at Microsoft

Linked List Math Stack

#116

Rank

#4077MediumFrequency: 37.4%

Lexicographically Smallest Negated Permutation that Sums to Target

Asked at Amazon

Array Math Two Pointers Greedy Sorting

#117

Rank

#400MediumFrequency: 36.9%

Nth Digit

Asked at Airbnb

Math Binary Search

#118

Rank

#2206MediumFrequency: 36.9%

Detonate the Maximum Bombs

Asked at Airbnb

Array Math Depth-First Search Breadth-First Search Graph Theory Geometry

#119

Rank

#96MediumFrequency: 36.8%

Unique Binary Search Trees

Math Dynamic Programming Tree Binary Search Tree Binary Tree

#120

Rank

#486MediumFrequency: 36.7%

Predict the Winner

Asked at Amazon

Array Math Dynamic Programming Recursion Minimax Game Theory Zero-Sum Game

#121

Rank

#60HardFrequency: 35.8%

Permutation Sequence

Asked at Google

#122

Rank

#371MediumFrequency: 35.8%

Sum of Two Integers

Asked at Google

Math Bit Manipulation

#123

Rank

#1426EasyFrequency: 35.7%

Find N Unique Integers Sum up to Zero

Asked at Microsoft

#124

Rank

#1630EasyFrequency: 35.7%

Count Odd Numbers in an Interval Range

Asked at Microsoft

#125

Rank

#3604HardFrequency: 35.1%

Find the Number of Possible Ways for an Event

Asked at Amazon

Math Dynamic Programming Combinatorics

#126

Rank

#3949MediumFrequency: 35.1%

Minimum Number of Primes to Sum to Target

Asked at Amazon

Array Math Dynamic Programming Number Theory

#127

Rank

#1003MediumFrequency: 34.8%

Minimum Area Rectangle II

Asked at Google

Array Hash Table Math Geometry

#128

Rank

#823HardFrequency: 34.3%

Split Array With Same Average

Asked at Microsoft

Array Hash Table Math Dynamic Programming Bit Manipulation Meet in the Middle Bitmask

#129

Rank

#1642EasyFrequency: 34.3%

Water Bottles

Asked at Microsoft

Math Simulation

#130

Rank

#1925MediumFrequency: 33.5%

Count Nice Pairs in an Array

Array Hash Table Math Counting

#131

Rank

#804MediumFrequency: 33.5%

Rotated Digits

Math Dynamic Programming

#132

Rank

#2307HardFrequency: 33.5%

Replace Non-Coprime Numbers in Array

Array Math Stack Number Theory Least Common Multiple Greatest Common Divisor

#133

Rank

#3273MediumFrequency: 33.3%

Most Expensive Item That Can Not Be Bought

Asked at Amazon

Math Dynamic Programming Number Theory

#134

Rank

#1411EasyFrequency: 33.3%

Convert Binary Number in a Linked List to Integer

Asked at Oracle

Linked List Math

#135

Rank

#956HardFrequency: 33.3%

Number of Music Playlists

Asked at Oracle

Math Dynamic Programming Combinatorics

#136

Rank

#263EasyFrequency: 33.1%

Ugly Number

Asked at Google

#137

Rank

#1477MediumFrequency: 33%

Product of the Last K Numbers

Asked at TikTok

Array Math Design Data Stream Prefix Sum

#138

Rank

#3655MediumFrequency: 32.8%

Digit Operations to Make Two Integers Equal

Asked at Microsoft

Math Graph Theory Heap (Priority Queue)Number Theory Shortest Path

#139

Rank

#826MediumFrequency: 32.4%

Soup Servings

Asked at Google

Math Dynamic Programming Probability and Statistics

#140

Rank

#3321EasyFrequency: 32.4%

Type of Triangle

Asked at Google

Array Math Sorting Polygons

#141

Rank

#89MediumFrequency: 32.3%

Gray Code

Asked at Amazon

Math Backtracking Bit Manipulation

#142

Rank

#241MediumFrequency: 32.3%

Different Ways to Add Parentheses

Asked at Amazon

Math String Dynamic Programming Recursion Memoization Bracket Sequences

#143

Rank

#2919HardFrequency: 32.3%

Maximum Number of Groups With Increasing Length

Asked at Amazon

Array Math Binary Search Greedy Sorting

#144

Rank

#1771MediumFrequency: 32.3%

Sell Diminishing-Valued Colored Balls

Asked at Amazon

Array Math Binary Search Greedy Sorting Heap (Priority Queue)

#145

Rank

#903MediumFrequency: 32.1%

Implement Rand10() Using Rand7()

Asked at LinkedIn

Math Rejection Sampling Randomized Probability and Statistics

#146

Rank

#382MediumFrequency: 31.8%

Linked List Random Node

Asked at Google

Linked List Math Reservoir Sampling Randomized

#147

Rank

#396MediumFrequency: 31.3%

Rotate Function

Asked at Amazon

Array Math Dynamic Programming

#148

Rank

#1446MediumFrequency: 31.3%

Angle Between Hands of a Clock

Asked at Amazon

#149

Rank

#3851HardFrequency: 31.3%

Find Sum of Array Product of Magical Sequences

Asked at Infosys

Array Math Dynamic Programming Bit Manipulation Combinatorics Bitmask

#150

Rank

#870MediumFrequency: 31.3%

Magic Squares In Grid

Asked at Infosys

Array Hash Table Math Matrix

#151

Rank

#1947HardFrequency: 31.3%

Number of Different Subsequences GCDs

Asked at Infosys

Array Math Counting Number Theory Euclidean Algorithm Greatest Common Divisor

#152

Rank

#3983HardFrequency: 31.3%

Minimum Operations to Equalize Binary String

Asked at Infosys

Math String Breadth-First Search Union-Find Ordered Set

#153

Rank

#1617HardFrequency: 31.3%

Stone Game IV

Asked at Infosys

Math Dynamic Programming Minimax Game Theory Nim Game Sprague–Grundy Theorem Zero-Sum Game

#154

Rank

#343MediumFrequency: 31.3%

Integer Break

Asked at Infosys

Math Dynamic Programming

#155

Rank

#453MediumFrequency: 31.3%

Minimum Moves to Equal Array Elements

Asked at Infosys

#156

Rank

#1329EasyFrequency: 31.3%

Minimum Cost to Move Chips to The Same Position

Asked at Infosys

Array Math Greedy

#157

Rank

#166MediumFrequency: 31.1%

Fraction to Recurring Decimal

Asked at Google

Hash Table Math String

#158

Rank

#441EasyFrequency: 31.1%

Arranging Coins

Asked at Microsoft

Math Binary Search

#159

Rank

#651MediumFrequency: 31.1%

4 Keys Keyboard

Asked at Microsoft

Math Dynamic Programming

#160

Rank

#2155MediumFrequency: 31.1%

Find Missing Observations

Asked at Microsoft

Array Math Simulation

#161

Rank

#1522HardFrequency: 30.4%

Stone Game III

Asked at Google

Array Math Dynamic Programming Minimax Game Theory Zero-Sum Game

#162

Rank

#3201MediumFrequency: 30.2%

Distribute Candies Among Children II

Asked at Amazon

Math Combinatorics Enumeration

#163

Rank

#867MediumFrequency: 29.7%

New 21 Game

Asked at Google

Math Dynamic Programming Sliding Window Probability and Statistics

#164

Rank

#909MediumFrequency: 29.7%

Stone Game

Asked at Google

Array Math Dynamic Programming Minimax Game Theory Zero-Sum Game

#165

Rank

#1031EasyFrequency: 29.5%

Add to Array-Form of Integer

#166

Rank

#1395EasyFrequency: 29.5%

Minimum Time Visiting All Points

Array Math Geometry

#167

Rank

#672MediumFrequency: 29.3%

Bulb Switcher II

Asked at Microsoft

Math Bit Manipulation Depth-First Search Breadth-First Search

#168

Rank

#1048MediumFrequency: 29.3%

Clumsy Factorial

Asked at Microsoft

Math Stack Simulation

#169

Rank

#1993EasyFrequency: 29.1%

Sum of All Subset XOR Totals

Asked at Amazon

Array Math Backtracking Bit Manipulation Combinatorics Enumeration

#170

Rank

#4242MediumFrequency: 29.1%

Sum of GCD of Formed Pairs

Asked at Amazon

Array Math Two Pointers Sorting Simulation Number Theory

#171

Rank

#795MediumFrequency: 28.9%

K-th Symbol in Grammar

Asked at Google

Math Bit Manipulation Recursion

#172

Rank

#830EasyFrequency: 28.9%

Largest Triangle Area

Asked at Google

Array Math Geometry Polygons

#173

Rank

#1635EasyFrequency: 28.9%

Number of Good Pairs

Asked at Google

Array Hash Table Math Counting

#174

Rank

#357MediumFrequency: 28.1%

Count Numbers with Unique Digits

Asked at Google

Math Dynamic Programming Backtracking

#175

Rank

#539MediumFrequency: 28.1%

Minimum Time Difference

Asked at Google

Array Math String Sorting

#176

Rank

#1421EasyFrequency: 28.1%

Find Numbers with Even Number of Digits

Asked at Google

#177

Rank

#1571HardFrequency: 27.8%

Allocate Mailboxes

Asked at Amazon

Array Math Dynamic Programming Sorting

#178

Rank

#1768MediumFrequency: 27.8%

Design an Expression Tree With Evaluate Function

Asked at Amazon

Array Math Stack Tree Design Binary Tree

#179

Rank

#2481MediumFrequency: 27.8%

Strictly Palindromic Number

Asked at Amazon

Math Two Pointers Brainteaser

#180

Rank

#1223HardFrequency: 27.8%

Graph Connectivity With Threshold

Array Math Union-Find Number Theory

#181

Rank

#914MediumFrequency: 27.8%

Random Point in Non-overlapping Rectangles

Array Math Binary Search Reservoir Sampling Prefix Sum Ordered Set Randomized

#182

Rank

#3933MediumFrequency: 27.8%

Minimum Jumps to Reach End via Prime Teleportation

Array Hash Table Math Breadth-First Search Number Theory

#183

Rank

#1012HardFrequency: 27.3%

Equal Rational Numbers

Asked at Microsoft

#184

Rank

#1183MediumFrequency: 27.3%

Statistics from a Large Sample

Asked at Microsoft

Array Math Probability and Statistics

#185

Rank

#1230MediumFrequency: 27.3%

Maximum of Absolute Value Expression

Asked at Microsoft

#186

Rank

#1678MediumFrequency: 27.3%

Number of Ways to Split a String

Asked at Microsoft

#187

Rank

#1936HardFrequency: 27.3%

Maximize Number of Nice Divisors

Asked at Microsoft

Math Recursion Number Theory

#188

Rank

#1950EasyFrequency: 27.3%

Sign of the Product of an Array

Asked at Microsoft

#189

Rank

#2033MediumFrequency: 27.3%

The Number of Full Rounds You Have Played

Asked at Microsoft

#190

Rank

#2083EasyFrequency: 27.3%

Three Divisors

Asked at Microsoft

Math Enumeration Number Theory Prime Factorization Sieve Theory

#191

Rank

#2593MediumFrequency: 27.3%

Number of Distinct Binary Strings After Applying Operations

Asked at Microsoft

#192

Rank

#3111MediumFrequency: 27.3%

Smallest Number With Given Digit Product

Asked at Microsoft

#193

Rank

#3315HardFrequency: 27.3%

Maximum Number of Intersections on the Chart

Asked at Microsoft

Array Hash Table Math Binary Indexed Tree Geometry Sweep Line Sorting

#194

Rank

#3945MediumFrequency: 27.3%

Minimum Sensors to Cover Grid

Asked at Microsoft

#195

Rank

#1064MediumFrequency: 27.2%

Smallest Integer Divisible by K

Asked at Google

Hash Table Math Pigeonhole Principle

#196

Rank

#2032EasyFrequency: 26.5%

Largest Odd Number in String

Asked at Amazon

Math String Greedy

#197

Rank

#2125HardFrequency: 26.5%

GCD Sort of an Array

Asked at Amazon

Array Math Union-Find Sorting Number Theory Prime Factorization Euclidean Algorithm Greatest Common Divisor

#198

Rank

#3275EasyFrequency: 26.5%

Minimum Number of Pushes to Type Word I

Asked at Amazon

Math String Greedy

#199

Rank

#3768EasyFrequency: 26.5%

Check If Digits Are Equal in String After Operations I

Asked at Amazon

Math String Simulation Combinatorics Number Theory

#200

Rank

#342EasyFrequency: 26.3%

Power of Four

Asked at Google

Math Bit Manipulation Recursion

#201

Rank

#3699MediumFrequency: 26.3%

Count Special Subsequences

Asked at Google

Array Hash Table Math Enumeration

#202

Rank

#1236EasyFrequency: 25.4%

N-th Tribonacci Number

Asked at Google

Math Dynamic Programming Memoization

#203

Rank

#292EasyFrequency: 25.4%

Nim Game

Asked at Google

Math Brainteaser Minimax Game Theory Nim Game Impartial Game

#204

Rank

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#247

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Array Math Sorting Heap (Priority Queue)Matrix Prefix Sum

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#269

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#270

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#277

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#278

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#279

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#283

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#284

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#294

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#298

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#299

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#300

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#301

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#307

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#309

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#318

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#322

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#325

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#331

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#332

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#336

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#339

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#340

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#341

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#342

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#344

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#345

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#347

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#348

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#349

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#3229MediumFrequency: 16.4%

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#3314MediumFrequency: 16.4%

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#2507EasyFrequency: 16.4%

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#352

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#3583HardFrequency: 16.4%

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#353

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#1018EasyFrequency: 16.4%

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#354

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#2174MediumFrequency: 16.4%

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#356

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#4136MediumFrequency: 16.4%

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#357

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#4085MediumFrequency: 16.4%

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#360

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#3970MediumFrequency: 16.4%

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#361

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#462MediumFrequency: 16.1%

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#3555EasyFrequency: 16.1%

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#363

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#1631MediumFrequency: 16.1%

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#364

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#365

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#366

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#1448EasyFrequency: 16.1%

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#367

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#368

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#3676EasyFrequency: 16.1%

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#370

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#371

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#372

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#373

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#2709MediumFrequency: 14.6%

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#374

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#3243HardFrequency: 14.6%

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#375

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#1500EasyFrequency: 14.6%

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#376

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#3637HardFrequency: 14.6%

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#377

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#3859EasyFrequency: 14.6%

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#378

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#2202HardFrequency: 14.6%

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#379

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#2649MediumFrequency: 14.4%

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#381

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#384

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#385

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#592MediumFrequency: 12.6%

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#386

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#2288EasyFrequency: 12.6%

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#387

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#388

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#3581EasyFrequency: 12.6%

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#389

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#390

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#2031MediumFrequency: 12%

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#2903MediumFrequency: 12%

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#392

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#1806EasyFrequency: 12%

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#393

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#395

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#396

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#3606EasyFrequency: 12%

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#397

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#1733HardFrequency: 10.5%

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#399

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#1369MediumFrequency: 10.5%

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#400

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#402

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#404

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#3864MediumFrequency: 10.5%

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#3842HardFrequency: 10.5%

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#406

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#3813HardFrequency: 10.5%

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#412

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#413

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#425

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#432

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#439

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#444

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#479

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#481

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#483

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#484

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#485

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#486

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#492

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#495

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#496

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#497

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#499

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#500

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#502

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#503

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#504

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#506

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#507

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#508

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#509

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#510

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#511

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#512

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#513

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#515

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#516

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