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Two Pointers Interview Questions

Master 212 two pointers problems frequently asked in technical interviews. These questions test your understanding of two pointersconcepts and are essential for coding interview success.

212

Total Problems

60

Easy

125

Medium

27

Hard

Related Topics

Array String Sorting Binary Search Greedy Hash Table Dynamic Programming Linked List

#408EasyFrequency: 96.8%

Valid Word Abbreviation

Two Pointers String

#1

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#680EasyFrequency: 95.1%

Valid Palindrome II

Two Pointers String Greedy

#2

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#1790MediumFrequency: 88.5%

Lowest Common Ancestor of a Binary Tree III

Hash Table Two Pointers Tree Binary Tree Binary Lifting Lowest Common Ancestor

#3

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#443MediumFrequency: 88.1%

String Compression

Asked at Salesforce

Two Pointers String

#4

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#42HardFrequency: 88%

Trapping Rain Water

Asked at Amazon

Array Two Pointers Dynamic Programming Stack Monotonic Stack

#5

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#88EasyFrequency: 86.3%

Merge Sorted Array

Array Two Pointers Sorting

#6

Rank

#1019EasyFrequency: 85.8%

Squares of a Sorted Array

Array Two Pointers Sorting

#7

Rank

#251MediumFrequency: 85.6%

Flatten 2D Vector

Asked at Airbnb

Array Two Pointers Design Iterator

#8

Rank

#253MediumFrequency: 83.8%

Meeting Rooms II

Asked at TikTok

Array Two Pointers Greedy Sorting Heap (Priority Queue)Prefix Sum

#9

Rank

#125EasyFrequency: 82.6%

Valid Palindrome

Two Pointers String

#10

Rank

#244MediumFrequency: 82.3%

Shortest Word Distance II

Asked at LinkedIn

Array Hash Table Two Pointers String Design

#11

Rank

#277MediumFrequency: 80.7%

Find the Celebrity

Asked at LinkedIn

Two Pointers Graph Theory Interactive

#12

Rank

#5MediumFrequency: 80.5%

Longest Palindromic Substring

Asked at Microsoft

Two Pointers String Dynamic Programming Manacher

#13

Rank

#1713MediumFrequency: 79.6%

Dot Product of Two Sparse Vectors

Array Hash Table Two Pointers Design Linear Algebra

#14

Rank

#31MediumFrequency: 79%

Next Permutation

Array Two Pointers

#15

Rank

#15MediumFrequency: 78.3%

3Sum

Asked at Amazon

Array Two Pointers Sorting

#16

Rank

#189MediumFrequency: 78.2%

Rotate Array

Array Math Two Pointers

#17

Rank

#11MediumFrequency: 76.7%

Container With Most Water

Asked at Amazon

Array Two Pointers Greedy

#18

Rank

#1165MediumFrequency: 76%

Meeting Scheduler

Asked at PayPal

Array Two Pointers Sorting

#19

Rank

#160EasyFrequency: 73.9%

Intersection of Two Linked Lists

Asked at Airbnb

Hash Table Linked List Two Pointers

#20

Rank

#1028MediumFrequency: 73.6%

Interval List Intersections

Array Two Pointers Sweep Line

#21

Rank

#26EasyFrequency: 70.8%

Remove Duplicates from Sorted Array

Asked at Microsoft

Array Two Pointers

#22

Rank

#1894EasyFrequency: 69.5%

Merge Strings Alternately

Asked at Google

Two Pointers String

#23

Rank

#151MediumFrequency: 68%

Reverse Words in a String

Two Pointers String

#24

Rank

#283EasyFrequency: 67.6%

Move Zeroes

Asked at Infosys

Array Two Pointers

#25

Rank

#853MediumFrequency: 67.4%

Most Profit Assigning Work

Asked at DoorDash

Array Two Pointers Binary Search Greedy Sorting

#26

Rank

#360MediumFrequency: 66.5%

Sort Transformed Array

Asked at LinkedIn

Array Math Two Pointers Sorting

#27

Rank

#295HardFrequency: 66.4%

Find Median from Data Stream

Asked at PayPal

Two Pointers Design Sorting Heap (Priority Queue)Data Stream

#28

Rank

#202EasyFrequency: 65.5%

Happy Number

Asked at Airbnb

Hash Table Math Two Pointers Floyd's Cycle Finding Algorithm

#29

Rank

#19MediumFrequency: 64.7%

Remove Nth Node From End of List

Linked List Two Pointers

#30

Rank

#556MediumFrequency: 64.6%

Next Greater Element III

Asked at DoorDash

Math Two Pointers String

#31

Rank

#658MediumFrequency: 64.6%

Find K Closest Elements

Asked at DoorDash

Array Two Pointers Binary Search Sliding Window Sorting Heap (Priority Queue)

#32

Rank

#75MediumFrequency: 64.1%

Sort Colors

Asked at Microsoft

Array Two Pointers Sorting Quicksort Bubble Sort

#33

Rank

#647MediumFrequency: 63%

Palindromic Substrings

Two Pointers String Dynamic Programming

#34

Rank

#272HardFrequency: 61.6%

Closest Binary Search Tree Value II

Asked at LinkedIn

Two Pointers Stack Tree Depth-First Search Binary Search Tree Heap (Priority Queue)Binary Tree

#35

Rank

#1972MediumFrequency: 60.5%

Rotating the Box

Array Two Pointers Matrix

#36

Rank

#321HardFrequency: 59.8%

Create Maximum Number

Asked at Flipkart

Array Two Pointers Stack Greedy Monotonic Stack

#37

Rank

#18MediumFrequency: 59.4%

4Sum

Asked at Amazon

Array Two Pointers Sorting

#38

Rank

#143MediumFrequency: 59.3%

Reorder List

Asked at TikTok

Linked List Two Pointers Stack Recursion

#39

Rank

#27EasyFrequency: 57.9%

Remove Element

Asked at Google

Array Two Pointers

#40

Rank

#2699MediumFrequency: 57.5%

Count the Number of Fair Pairs

Asked at Salesforce

Array Two Pointers Binary Search Sorting

#41

Rank

#234EasyFrequency: 57.2%

Palindrome Linked List

Asked at Amazon

Linked List Two Pointers Stack Recursion

#42

Rank

#259MediumFrequency: 57%

3Sum Smaller

Asked at PayPal

Array Two Pointers Binary Search Sorting

#43

Rank

#287MediumFrequency: 55.7%

Find the Duplicate Number

Asked at Amazon

Array Two Pointers Binary Search Bit Manipulation Pigeonhole Principle Floyd's Cycle Finding Algorithm

#44

Rank

#167MediumFrequency: 55.5%

Two Sum II - Input Array Is Sorted

Asked at Amazon

Array Two Pointers Binary Search

#45

Rank

#28EasyFrequency: 55.2%

Find the Index of the First Occurrence in a String

Asked at Microsoft

Two Pointers String String Matching Z Algorithm Knuth–Morris–Pratt Algorithm Boyer–Moore String-Search Algorithm

#46

Rank

#165MediumFrequency: 55%

Compare Version Numbers

Two Pointers String

#47

Rank

#141EasyFrequency: 52.8%

Linked List Cycle

Asked at Microsoft

Hash Table Linked List Two Pointers Floyd's Cycle Finding Algorithm

#48

Rank

#567MediumFrequency: 52.8%

Permutation in String

Asked at Microsoft

Hash Table Two Pointers String Sliding Window

#49

Rank

#532MediumFrequency: 52.4%

K-diff Pairs in an Array

Asked at Salesforce

Array Hash Table Two Pointers Binary Search Sorting

#50

Rank

#16MediumFrequency: 51.4%

3Sum Closest

Asked at Amazon

Array Two Pointers Sorting

#51

Rank

#908EasyFrequency: 51.4%

Middle of the Linked List

Asked at Amazon

Linked List Two Pointers

#52

Rank

#2701HardFrequency: 51.3%

Subsequence With the Minimum Score

Asked at DoorDash

Two Pointers String Binary Search

#53

Rank

#349EasyFrequency: 51.1%

Intersection of Two Arrays

Asked at Amazon

Array Hash Table Two Pointers Binary Search Sorting

#54

Rank

#246EasyFrequency: 50.5%

Strobogrammatic Number

Hash Table Two Pointers String

#55

Rank

#852MediumFrequency: 50.5%

Friends Of Appropriate Ages

Array Two Pointers Binary Search Sorting

#56

Rank

#61MediumFrequency: 50%

Rotate List

Asked at Amazon

Linked List Two Pointers

#57

Rank

#80MediumFrequency: 48.9%

Remove Duplicates from Sorted Array II

Asked at Amazon

Array Two Pointers

#58

Rank

#3248HardFrequency: 48.7%

Count the Number of Incremovable Subarrays II

Array Two Pointers Binary Search

#59

Rank

#3252EasyFrequency: 48.7%

Count the Number of Incremovable Subarrays I

Array Two Pointers Binary Search Enumeration

#60

Rank

#875MediumFrequency: 48%

Longest Mountain in Array

Asked at TikTok

Array Two Pointers Dynamic Programming Enumeration

#61

Rank

#161MediumFrequency: 47.5%

One Edit Distance

Two Pointers String

#62

Rank

#186MediumFrequency: 47.5%

Reverse Words in a String II

Two Pointers String

#63

Rank

#1486EasyFrequency: 47.5%

Find the Distance Value Between Two Arrays

Array Two Pointers Binary Search Sorting

#64

Rank

#2093EasyFrequency: 47.5%

Check If String Is a Prefix of Array

Array Two Pointers String

#65

Rank

#345EasyFrequency: 47.4%

Reverse Vowels of a String

Asked at Oracle

Two Pointers String

#66

Rank

#2019MediumFrequency: 46.5%

Product of Two Run-Length Encoded Arrays

Array Two Pointers

#67

Rank

#148MediumFrequency: 46%

Sort List

Asked at Amazon

Linked List Two Pointers Divide and Conquer Sorting Merge Sort

#68

Rank

#344EasyFrequency: 45.6%

Reverse String

Asked at Amazon

Two Pointers String

#69

Rank

#142MediumFrequency: 45%

Linked List Cycle II

Asked at Microsoft

Hash Table Linked List Two Pointers Floyd's Cycle Finding Algorithm

#70

Rank

#170EasyFrequency: 44.7%

Two Sum III - Data structure design

Asked at LinkedIn

Array Hash Table Two Pointers Design Data Stream

#71

Rank

#2559HardFrequency: 44.7%

Maximum Number of Non-overlapping Palindrome Substrings

Asked at LinkedIn

Two Pointers String Dynamic Programming Greedy

#72

Rank

#633MediumFrequency: 44.7%

Sum of Square Numbers

Asked at LinkedIn

Math Two Pointers Binary Search

#73

Rank

#2271MediumFrequency: 44.6%

Rearrange Array Elements by Sign

Asked at Amazon

Array Two Pointers Simulation

#74

Rank

#581MediumFrequency: 44%

Shortest Unsorted Continuous Subarray

Asked at TikTok

Array Two Pointers Stack Greedy Sorting Monotonic Stack

#75

Rank

#392EasyFrequency: 43.3%

Is Subsequence

Two Pointers String Dynamic Programming

#76

Rank

#917MediumFrequency: 43.2%

Boats to Save People

Asked at Flipkart

Array Two Pointers Greedy Sorting Timsort

#77

Rank

#2414MediumFrequency: 42.7%

Move Pieces to Obtain a String

Asked at Google

Two Pointers String

#78

Rank

#768MediumFrequency: 41.4%

Partition Labels

Asked at Amazon

Hash Table Two Pointers String Greedy

#79

Rank

#2095MediumFrequency: 40.9%

Minimum Number of Swaps to Make the String Balanced

Asked at PayPal

Two Pointers String Stack Greedy Bracket Sequences

#80

Rank

#2581MediumFrequency: 40.9%

Divide Players Into Teams of Equal Skill

Asked at PayPal

Array Hash Table Two Pointers Sorting

#81

Rank

#1129MediumFrequency: 40.9%

Longest String Chain

Asked at PayPal

Array Hash Table Two Pointers String Dynamic Programming Sorting

#82

Rank

#793MediumFrequency: 40.2%

Swap Adjacent in LR String

Asked at Google

Two Pointers String

#83

Rank

#455EasyFrequency: 40.2%

Assign Cookies

Asked at Amazon

Array Two Pointers Greedy Sorting Quicksort

#84

Rank

#611MediumFrequency: 39.4%

Valid Triangle Number

Asked at LinkedIn

Array Two Pointers Binary Search Greedy Sorting

#85

Rank

#2565MediumFrequency: 39.1%

Merge Operations to Turn Array Into a Palindrome

Asked at TikTok

Array Two Pointers Greedy

#86

Rank

#1923MediumFrequency: 39.1%

Sentence Similarity III

Asked at TikTok

Array Two Pointers String

#87

Rank

#1002MediumFrequency: 39%

Maximum Width Ramp

Asked at Google

Array Two Pointers Stack Monotonic Stack

#88

Rank

#3643MediumFrequency: 39%

Zero Array Transformation II

Asked at Google

Array Two Pointers Binary Search Prefix Sum

#89

Rank

#86MediumFrequency: 38.2%

Partition List

Asked at Amazon

Linked List Two Pointers

#90

Rank

#696EasyFrequency: 38.2%

Count Binary Substrings

Asked at Microsoft

Two Pointers String

#91

Rank

#2588HardFrequency: 37.9%

Maximum Number of Points From Grid Queries

Array Two Pointers Breadth-First Search Union-Find Sorting Heap (Priority Queue)Matrix

#92

Rank

#4077MediumFrequency: 37.4%

Lexicographically Smallest Negated Permutation that Sums to Target

Asked at Amazon

Array Math Two Pointers Greedy Sorting

#93

Rank

#653EasyFrequency: 35.7%

Two Sum IV - Input is a BST

Asked at Microsoft

Hash Table Two Pointers Tree Depth-First Search Breadth-First Search Binary Search Tree Binary Tree

#94

Rank

#941EasyFrequency: 35%

Sort Array By Parity

Array Two Pointers Sorting

#95

Rank

#874EasyFrequency: 34.8%

Backspace String Compare

Asked at Google

Two Pointers String Stack Simulation

#96

Rank

#2162HardFrequency: 34.2%

Partition Array Into Two Arrays to Minimize Sum Difference

Asked at Google

Array Two Pointers Binary Search Dynamic Programming Bit Manipulation Meet in the Middle Sorting Ordered Set Bitmask

#97

Rank

#528MediumFrequency: 34.2%

Swapping Nodes in a Linked List

Asked at Amazon

Linked List Two Pointers

#98

Rank

#541EasyFrequency: 33.1%

Reverse String II

Asked at Google

Two Pointers String

#99

Rank

#2417MediumFrequency: 32.4%

The Latest Time to Catch a Bus

Asked at Google

Array Two Pointers Binary Search Sorting

#100

Rank

#2265MediumFrequency: 32.3%

Partition Array According to Given Pivot

Asked at Amazon

Array Two Pointers Simulation

#101

Rank

#3018MediumFrequency: 31.3%

Make String a Subsequence Using Cyclic Increments

Asked at Amazon

Two Pointers String

#102

Rank

#1621MediumFrequency: 31.3%

Number of Subsequences That Satisfy the Given Sum Condition

Asked at Infosys

Array Two Pointers Binary Search Sorting

#103

Rank

#82MediumFrequency: 31.1%

Remove Duplicates from Sorted List II

Asked at Google

Linked List Two Pointers

#104

Rank

#861EasyFrequency: 31.1%

Flipping an Image

Asked at Google

Array Two Pointers Bit Manipulation Matrix Simulation

#105

Rank

#2634EasyFrequency: 31.1%

Minimum Common Value

Asked at Microsoft

Array Hash Table Two Pointers Binary Search

#106

Rank

#1468EasyFrequency: 29.7%

Check If N and Its Double Exist

Asked at Google

Array Hash Table Two Pointers Binary Search Sorting

#107

Rank

#557EasyFrequency: 29.1%

Reverse Words in a String III

Asked at Amazon

Two Pointers String

#108

Rank

#4242MediumFrequency: 29.1%

Sum of GCD of Formed Pairs

Asked at Amazon

Array Math Two Pointers Sorting Simulation Number Theory

#109

Rank

#350EasyFrequency: 28.9%

Intersection of Two Arrays II

Asked at Google

Array Hash Table Two Pointers Binary Search Sorting

#110

Rank

#1168EasyFrequency: 28.9%

Duplicate Zeros

Asked at Google

Array Two Pointers

#111

Rank

#3647MediumFrequency: 28.1%

Zero Array Transformation III

Asked at Google

Array Two Pointers Greedy Sorting Heap (Priority Queue)Prefix Sum

#112

Rank

#475MediumFrequency: 27.8%

Heaters

Asked at Amazon

Array Two Pointers Binary Search Sorting

#113

Rank

#2481MediumFrequency: 27.8%

Strictly Palindromic Number

Asked at Amazon

Math Two Pointers Brainteaser

#114

Rank

#1356HardFrequency: 27.3%

Minimum Number of Moves to Make Palindrome

Asked at Microsoft

Two Pointers String Greedy Binary Indexed Tree

#115

Rank

#2524EasyFrequency: 27.3%

Largest Positive Integer That Exists With Its Negative

Asked at Microsoft

Array Hash Table Two Pointers Sorting

#116

Rank

#2216MediumFrequency: 27.2%

Delete the Middle Node of a Linked List

Asked at Google

Linked List Two Pointers

#117

Rank

#958EasyFrequency: 26.5%

Sort Array By Parity II

Asked at Amazon

Array Two Pointers Sorting

#118

Rank

#1679MediumFrequency: 26.5%

Shortest Subarray to be Removed to Make Array Sorted

Asked at Amazon

Array Two Pointers Binary Search Stack Monotonic Stack

#119

Rank

#1798MediumFrequency: 26.5%

Max Number of K-Sum Pairs

Asked at Amazon

Array Hash Table Two Pointers Sorting

#120

Rank

#3959MediumFrequency: 26.5%

Maximum Total from Optimal Activation Order

Asked at Amazon

Array Two Pointers Greedy Sorting Heap (Priority Queue)

#121

Rank

#827MediumFrequency: 26.3%

Expressive Words

Asked at Google

Array Two Pointers String

#122

Rank

#985MediumFrequency: 26.3%

Bag of Tokens

Asked at Google

Array Two Pointers Greedy Sorting

#123

Rank

#2320EasyFrequency: 25.4%

Find All K-Distant Indices in an Array

Asked at Google

Array Two Pointers

#124

Rank

#2664MediumFrequency: 25.3%

Maximize Greatness of an Array

Asked at Oracle

Array Two Pointers Greedy Sorting

#125

Rank

#2233MediumFrequency: 25.1%

Number of Smooth Descent Periods of a Stock

Asked at Amazon

Array Math Two Pointers Dynamic Programming Sliding Window

#126

Rank

#2236MediumFrequency: 25.1%

Maximum Twin Sum of a Linked List

Asked at Amazon

Linked List Two Pointers Stack

#127

Rank

#2917EasyFrequency: 25.1%

Count Pairs Whose Sum is Less than Target

Array Two Pointers Binary Search Sorting

#128

Rank

#1358MediumFrequency: 24.6%

Find Positive Integer Solution for a Given Equation

Asked at TikTok

Math Two Pointers Binary Search Interactive

#129

Rank

#723MediumFrequency: 24.6%

Candy Crush

Asked at TikTok

Array Two Pointers Matrix Simulation

#130

Rank

#2707EasyFrequency: 24.4%

Merge Two 2D Arrays by Summing Values

Asked at Google

Array Hash Table Two Pointers

#131

Rank

#1083EasyFrequency: 23.6%

Two Sum Less Than K

Asked at Amazon

Array Two Pointers Binary Search Sorting

#132

Rank

#1150MediumFrequency: 23.6%

Two Sum BSTs

Asked at Amazon

Two Pointers Binary Search Stack Tree Depth-First Search Binary Search Tree Binary Tree

#133

Rank

#1454EasyFrequency: 23.6%

Remove Palindromic Subsequences

Asked at Amazon

Two Pointers String

#134

Rank

#1850MediumFrequency: 23.6%

Minimum Length of String After Deleting Similar Ends

Asked at Amazon

Two Pointers String

#135

Rank

#1997HardFrequency: 23.6%

Next Palindrome Using Same Digits

Asked at Amazon

Two Pointers String

#136

Rank

#2497MediumFrequency: 23.6%

Maximum Matching of Players With Trainers

Asked at Amazon

Array Two Pointers Greedy Sorting

#137

Rank

#3692HardFrequency: 23.6%

Shortest Matching Substring

Asked at Amazon

Two Pointers String Binary Search String Matching

#138

Rank

#4079MediumFrequency: 23.6%

Maximum Capacity Within Budget

Asked at Amazon

Array Two Pointers Binary Search Sorting

#139

Rank

#1980EasyFrequency: 23.4%

Faulty Sensor

Array Two Pointers

#140

Rank

#868MediumFrequency: 23.3%

Push Dominoes

Asked at Google

Two Pointers String Dynamic Programming

#141

Rank

#3195MediumFrequency: 22.5%

Separate Black and White Balls

Asked at Microsoft

Two Pointers String Greedy

#142

Rank

#524MediumFrequency: 22.1%

Longest Word in Dictionary through Deleting

Asked at Google

Array Two Pointers String Sorting

#143

Rank

#1815HardFrequency: 22.1%

Checking Existence of Edge Length Limited Paths

Asked at Google

Array Two Pointers Union-Find Graph Theory Sorting

#144

Rank

#1874MediumFrequency: 21.9%

Form Array by Concatenating Subarrays of Another Array

Asked at Amazon

Array Two Pointers Greedy String Matching Knuth–Morris–Pratt Algorithm

#145

Rank

#2232MediumFrequency: 21.9%

Adding Spaces to a String

Asked at Amazon

Array Two Pointers String Simulation

#146

Rank

#2561EasyFrequency: 21.9%

Number of Distinct Averages

Asked at Amazon

Array Hash Table Two Pointers Sorting

#147

Rank

#2572MediumFrequency: 21.9%

Append Characters to String to Make Subsequence

Asked at Amazon

Two Pointers String Greedy

#148

Rank

#2140HardFrequency: 21.5%

Longest Subsequence Repeated k Times

Hash Table Two Pointers String Backtracking Counting Enumeration

#149

Rank

#481MediumFrequency: 20.9%

Magical String

Asked at Google

Two Pointers String

#150

Rank

#979EasyFrequency: 20.9%

DI String Match

Asked at Google

Array Two Pointers String Greedy

#151

Rank

#1918HardFrequency: 20.9%

Maximum Score of a Good Subarray

Asked at Google

Array Two Pointers Binary Search Stack Monotonic Stack Cartesian Tree

#152

Rank

#811MediumFrequency: 20.3%

Number of Subarrays with Bounded Maximum

Array Two Pointers

#153

Rank

#719HardFrequency: 20.3%

Find K-th Smallest Pair Distance

Array Two Pointers Binary Search Sorting

#154

Rank

#1774MediumFrequency: 20%

Add Two Polynomials Represented as Linked Lists

Asked at Amazon

Linked List Math Two Pointers

#155

Rank

#1891HardFrequency: 20%

Count Pairs Of Nodes

Asked at Amazon

Array Hash Table Two Pointers Binary Search Graph Theory Sorting Counting

#156

Rank

#2392MediumFrequency: 20%

Successful Pairs of Spells and Potions

Asked at Amazon

Array Two Pointers Binary Search Sorting

#157

Rank

#2468MediumFrequency: 20%

Valid Palindrome IV

Asked at Amazon

Two Pointers String

#158

Rank

#3471EasyFrequency: 20%

Minimum Average of Smallest and Largest Elements

Asked at Amazon

Array Two Pointers Sorting

#159

Rank

#4109MediumFrequency: 20%

Maximum Calories Burnt from Jumps

Asked at Amazon

Array Two Pointers Greedy Sorting

#160

Rank

#4177EasyFrequency: 20%

Reverse String Prefix

Asked at Amazon

Two Pointers String

#161

Rank

#961EasyFrequency: 20%

Long Pressed Name

Asked at LinkedIn

Two Pointers String

#162

Rank

#522MediumFrequency: 19.5%

Longest Uncommon Subsequence II

Asked at Google

Array Hash Table Two Pointers String Sorting

#163

Rank

#953EasyFrequency: 19.5%

Reverse Only Letters

Asked at Google

Two Pointers String

#164

Rank

#3303HardFrequency: 19.5%

Find Beautiful Indices in the Given Array II

Asked at Google

Two Pointers String Binary Search Rolling Hash String Matching Hash Function Z Algorithm Knuth–Morris–Pratt Algorithm Boyer–Moore String-Search Algorithm

#165

Rank

#1251HardFrequency: 18%

Longest Chunked Palindrome Decomposition

Asked at Google

Two Pointers String Dynamic Programming Greedy Rolling Hash Hash Function

#166

Rank

#1615MediumFrequency: 18%

Range Sum of Sorted Subarray Sums

Asked at Google

Array Two Pointers Binary Search Sorting Prefix Sum

#167

Rank

#1739MediumFrequency: 18%

Split Two Strings to Make Palindrome

Asked at Google

Two Pointers String

#168

Rank

#3524MediumFrequency: 18%

Minimum Number of Flips to Make Binary Grid Palindromic II

Asked at Google

Array Two Pointers Matrix

#169

Rank

#2551EasyFrequency: 18%

Apply Operations to an Array

Asked at Amazon

Array Two Pointers Simulation

#170

Rank

#2180HardFrequency: 18%

Maximum Number of Tasks You Can Assign

Asked at Amazon

Array Two Pointers Binary Search Greedy Queue Sorting Monotonic Queue

#171

Rank

#1051MediumFrequency: 16.4%

Shortest Way to Form String

Asked at Google

Two Pointers String Binary Search Greedy

#172

Rank

#1080MediumFrequency: 16.4%

Camelcase Matching

Asked at Google

Array Two Pointers String Trie String Matching

#173

Rank

#1581MediumFrequency: 16.4%

The k Strongest Values in an Array

Asked at Google

Array Two Pointers Sorting

#174

Rank

#1978MediumFrequency: 16.4%

Minimum Adjacent Swaps to Reach the Kth Smallest Number

Asked at Google

Two Pointers String Greedy

#175

Rank

#2228MediumFrequency: 16.4%

Watering Plants II

Asked at Google

Array Two Pointers Simulation

#176

Rank

#2241HardFrequency: 16.4%

Recover the Original Array

Asked at Google

Array Hash Table Two Pointers Sorting Enumeration

#177

Rank

#3967MediumFrequency: 16.4%

Earliest Finish Time for Land and Water Rides II

Asked at Google

Array Two Pointers Binary Search Greedy Sorting

#178

Rank

#3683MediumFrequency: 16.1%

Find the Lexicographically Largest String From the Box I

Asked at Microsoft

Two Pointers String Enumeration

#179

Rank

#841EasyFrequency: 16.1%

Shortest Distance to a Character

Asked at Microsoft

Array Two Pointers String

#180

Rank

#1133HardFrequency: 16.1%

Last Substring in Lexicographical Order

Asked at Microsoft

Two Pointers String Lyndon Factorization

#181

Rank

#3437MediumFrequency: 15.7%

Maximum Total Damage With Spell Casting

Asked at Amazon

Array Hash Table Two Pointers Binary Search Dynamic Programming Sorting Counting

#182

Rank

#3965EasyFrequency: 15.7%

Earliest Finish Time for Land and Water Rides I

Asked at Amazon

Array Two Pointers Binary Search Greedy Sorting

#183

Rank

#1659HardFrequency: 14.6%

Get the Maximum Score

Asked at Google

Array Two Pointers Dynamic Programming Greedy

#184

Rank

#3852HardFrequency: 14.6%

Path Existence Queries in a Graph II

Asked at Google

Array Two Pointers Binary Search Dynamic Programming Greedy Bit Manipulation Graph Theory Sorting

#185

Rank

#1988MediumFrequency: 14.6%

Minimize Maximum Pair Sum in Array

Asked at Google

Array Two Pointers Greedy Sorting

#186

Rank

#3584MediumFrequency: 14.6%

Find the Lexicographically Smallest Valid Sequence

Asked at Google

Two Pointers String Dynamic Programming Greedy

#187

Rank

#2128EasyFrequency: 13.2%

Reverse Prefix of Word

Asked at Amazon

Two Pointers String Stack

#188

Rank

#2553MediumFrequency: 12%

Total Cost to Hire K Workers

Asked at Microsoft

Array Two Pointers Heap (Priority Queue)Simulation

#189

Rank

#2488MediumFrequency: 10.5%

Divide Intervals Into Minimum Number of Groups

Asked at Google

Array Two Pointers Greedy Sorting Heap (Priority Queue)Prefix Sum

#190

Rank

#1009MediumFrequency: 10.3%

Pancake Sorting

Asked at Amazon

Array Two Pointers Greedy Sorting

#191

Rank

#959MediumFrequency: 8.1%

3Sum With Multiplicity

Asked at Google

Array Hash Table Two Pointers Sorting Counting

#192

Rank

#1881HardFrequency: 8.1%

Closest Subsequence Sum

Asked at Google

Array Two Pointers Dynamic Programming Bit Manipulation Meet in the Middle Sorting Bitmask

#193

Rank

#3873MediumFrequency: 8.1%

Subsequence Sum After Capping Elements

Asked at Google

Array Two Pointers Dynamic Programming Sorting

#194

Rank

#457MediumFrequency: 8.1%

Circular Array Loop

Asked at Google

Array Hash Table Two Pointers Floyd's Cycle Finding Algorithm

#195

Rank

#1566EasyFrequency: 7.3%

Check If a Word Occurs As a Prefix of Any Word in a Sentence

Asked at Microsoft

Two Pointers String String Matching

#196

Rank

#3245MediumFrequency: 7.3%

Find Beautiful Indices in the Given Array I

Asked at Microsoft

Two Pointers String Binary Search Rolling Hash String Matching Hash Function Z Algorithm Knuth–Morris–Pratt Algorithm Boyer–Moore String-Search Algorithm

#197

Rank

#1984MediumFrequency: 7.3%

Maximum Distance Between a Pair of Values

Asked at Microsoft

Array Two Pointers Binary Search

#198

Rank

#2027MediumFrequency: 7.2%

Maximum Number of Removable Characters

Asked at Amazon

Array Two Pointers String Binary Search

#199

Rank

#1831MediumFrequency: 5.5%

Ways to Split Array Into Three Subarrays

Asked at Google

Array Two Pointers Binary Search Prefix Sum

#200

Rank

#466HardFrequency: 5.5%

Count The Repetitions

Asked at Google

Two Pointers String Dynamic Programming

#201

Rank

#3973EasyFrequency: 5.5%

Flip Square Submatrix Vertically

Asked at Google

Array Two Pointers Matrix

#202

Rank

#4277MediumFrequency: 5.5%

Minimum Operations to Transform Array into Alternating Prime

Asked at Google

Array Math Two Pointers Binary Search Sorting Number Theory

#203

Rank

#2442EasyFrequency: 5%

Number of Arithmetic Triplets

Asked at Google

Array Hash Table Two Pointers Enumeration

#204

Rank

#3487MediumFrequency: 5%

Find Maximum Removals From Source String

Asked at Google

Array Hash Table Two Pointers String Dynamic Programming

#205

Rank

#3793MediumFrequency: 5%

Longest Palindrome After Substring Concatenation I

Asked at Google

Two Pointers String Dynamic Programming Enumeration

#206

Rank

#3808HardFrequency: 5%

Longest Palindrome After Substring Concatenation II

Asked at Google

Two Pointers String Dynamic Programming

#207

Rank

#901MediumFrequency: 5%

Advantage Shuffle

Asked at Amazon

Array Two Pointers Greedy Sorting

#208

Rank

#2698EasyFrequency: 5%

Find the Array Concatenation Value

Asked at Amazon

Array Two Pointers Simulation

#209

Rank

#3755MediumFrequency: 5%

Maximum Product of First and Last Elements of a Subsequence

Asked at Amazon

Array Two Pointers

#210

Rank

#2816EasyFrequency: 5%

Lexicographically Smallest Palindrome

Asked at Amazon

Two Pointers String Greedy

#211

Rank

#4312EasyFrequency: 5%

Limit Occurrences in Sorted Array

Array Two Pointers

#212

Rank

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