Array Interview Questions

Rank

#3594MediumFrequency: 100%

Identify the Largest Outlier in an Array

Array Hash Table Counting Enumeration

Rank

#1352HardFrequency: 100%

Maximum Profit in Job Scheduling

Array Binary Search Dynamic Programming Sorting

Rank

#3613MediumFrequency: 100%

Maximize Amount After Two Days of Conversions

Array String Depth-First Search Breadth-First Search Graph

Rank

#1085MediumFrequency: 100%

The Earliest Moment When Everyone Become Friends

Array Union Find Sorting

Rank

#64MediumFrequency: 100%

Minimum Path Sum

Rank

#817EasyFrequency: 100%

Design HashMap

Array Hash Table Linked List Design Hash Function

Rank

#322MediumFrequency: 100%

Coin Change

Array Dynamic Programming Breadth-First Search

Rank

#42HardFrequency: 100%

Trapping Rain Water

Array Two Pointers Dynamic Programming Stack Monotonic Stack

Rank

#3681MediumFrequency: 100%

Maximum Area Rectangle With Point Constraints I

Array Math Binary Indexed Tree Segment Tree Geometry Sorting Enumeration

#10

Rank

#1056MediumFrequency: 100%

Capacity To Ship Packages Within D Days

#11

Rank

#833HardFrequency: 95%

Bus Routes

Array Hash Table Breadth-First Search

#12

Rank

#739MediumFrequency: 94%

Daily Temperatures

#13

Rank

#2891MediumFrequency: 93%

Maximum Beauty of an Array After Applying Operation

Array Binary Search Sliding Window Sorting

#14

Rank

#152MediumFrequency: 93%

Maximum Product Subarray

#15

Rank

#84HardFrequency: 93%

Largest Rectangle in Histogram

#16

Rank

#3639MediumFrequency: 93%

Zero Array Transformation I

#17

Rank

#88EasyFrequency: 92%

Merge Sorted Array

#18

Rank

#215MediumFrequency: 92%

Kth Largest Element in an Array

Array Divide and Conquer Sorting Heap (Priority Queue)Quickselect

#19

Rank

#1046MediumFrequency: 91%

Max Consecutive Ones III

Array Binary Search Sliding Window Prefix Sum

#20

Rank

#122MediumFrequency: 90%

Best Time to Buy and Sell Stock II

#21

Rank

#121EasyFrequency: 89%

Best Time to Buy and Sell Stock

#22

Rank

#136EasyFrequency: 89%

Single Number

Array Bit Manipulation

#23

Rank

#852MediumFrequency: 89%

Friends Of Appropriate Ages

Array Two Pointers Binary Search Sorting

#24

Rank

#912MediumFrequency: 87%

Random Pick with Weight

Array Math Binary Search Prefix Sum Randomized

#25

Rank

#621MediumFrequency: 85%

Task Scheduler

Array Hash Table Greedy Sorting Heap (Priority Queue)Counting

#26

Rank

#162MediumFrequency: 85%

Find Peak Element

#27

Rank

#1019EasyFrequency: 85%

Squares of a Sorted Array

#28

Rank

#134MediumFrequency: 85%

Gas Station

#29

Rank

#1330MediumFrequency: 83%

Longest Arithmetic Subsequence of Given Difference

Array Hash Table Dynamic Programming

#30

Rank

#1108MediumFrequency: 83%

Analyze User Website Visit Pattern

Array Hash Table Sorting

#31

Rank

#772MediumFrequency: 83%

Construct Quad Tree

Array Divide and Conquer Tree Matrix

#32

Rank

#3654MediumFrequency: 83%

Minimum Array Sum

#33

Rank

#200MediumFrequency: 82%

Number of Islands

Array Depth-First Search Breadth-First Search Union Find Matrix

#34

Rank

#1014MediumFrequency: 82%

K Closest Points to Origin

Array Math Divide and Conquer Geometry Sorting Heap (Priority Queue)Quickselect

#35

Rank

#560MediumFrequency: 81%

Subarray Sum Equals K

#36

Rank

#348MediumFrequency: 81%

Design Tic-Tac-Toe

Array Hash Table Design Matrix Simulation

#37

Rank

#733EasyFrequency: 81%

Flood Fill

Array Depth-First Search Breadth-First Search Matrix

#38

Rank

#27EasyFrequency: 80%

Remove Element

#39

Rank

#53MediumFrequency: 79%

Maximum Subarray

Array Divide and Conquer Dynamic Programming

#40

Rank

#269HardFrequency: 79%

Alien Dictionary

Array String Depth-First Search Breadth-First Search Graph Topological Sort

#41

Rank

#305HardFrequency: 79%

Number of Islands II

#42

Rank

#362MediumFrequency: 79%

Design Hit Counter

Array Binary Search Design Queue Data Stream

#43

Rank

#380MediumFrequency: 79%

Insert Delete GetRandom O(1)

#44

Rank

#1966MediumFrequency: 79%

Frequency of the Most Frequent Element

Array Binary Search Greedy Sliding Window Sorting Prefix Sum

#45

Rank

#329HardFrequency: 79%

Longest Increasing Path in a Matrix

Array Dynamic Programming Depth-First Search Breadth-First Search Graph Topological Sort Memoization Matrix

#46

Rank

#4HardFrequency: 79%

Median of Two Sorted Arrays

Array Binary Search Divide and Conquer

#47

Rank

#74MediumFrequency: 78%

Search a 2D Matrix

Array Binary Search Matrix

#48

Rank

#356MediumFrequency: 77%

Line Reflection

Array Hash Table Math

#49

Rank

#347MediumFrequency: 76%

Top K Frequent Elements

Array Hash Table Divide and Conquer Sorting Heap (Priority Queue)Bucket Sort Counting Quickselect

#50

Rank

#1713MediumFrequency: 76%

Dot Product of Two Sparse Vectors

Array Hash Table Two Pointers Design

#51

Rank

#2267HardFrequency: 76%

Minimum Difference in Sums After Removal of Elements

Array Dynamic Programming Heap (Priority Queue)

#52

Rank

#2232MediumFrequency: 76%

Adding Spaces to a String

Array Two Pointers String Simulation

#53

Rank

#1478MediumFrequency: 76%

Maximum Number of Events That Can Be Attended

Array Greedy Sorting Heap (Priority Queue)

#54

Rank

#66EasyFrequency: 76%

Plus One

Array Math

#55

Rank

#249MediumFrequency: 76%

Group Shifted Strings

Array Hash Table String

#56

Rank

#3555EasyFrequency: 76%

Final Array State After K Multiplication Operations I

Array Math Heap (Priority Queue)Simulation

#57

Rank

#41HardFrequency: 74%

First Missing Positive

#58

Rank

#39MediumFrequency: 74%

Combination Sum

#59

Rank

#346EasyFrequency: 74%

Moving Average from Data Stream

Array Design Queue Data Stream

#60

Rank

#55MediumFrequency: 73%

Jump Game

#61

Rank

#2089MediumFrequency: 73%

Maximum Matrix Sum

Array Greedy Matrix

#62

Rank

#2711HardFrequency: 73%

Minimum Time to Visit a Cell In a Grid

Array Breadth-First Search Graph Heap (Priority Queue)Matrix Shortest Path

#63

Rank

#49MediumFrequency: 72%

Group Anagrams

Array Hash Table String Sorting

#64

Rank

#56MediumFrequency: 72%

Merge Intervals

#65

Rank

#381HardFrequency: 72%

Insert Delete GetRandom O(1) - Duplicates allowed

#66

Rank

#605EasyFrequency: 72%

Can Place Flowers

#67

Rank

#658MediumFrequency: 72%

Find K Closest Elements

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

#68

Rank

#325MediumFrequency: 71%

Maximum Size Subarray Sum Equals k

#69

Rank

#1028MediumFrequency: 69%

Interval List Intersections

#70

Rank

#1171MediumFrequency: 69%

Shortest Path in Binary Matrix

#71

Rank

#753MediumFrequency: 69%

Open the Lock

Array Hash Table String Breadth-First Search

#72

Rank

#518MediumFrequency: 69%

Coin Change II

#73

Rank

#90MediumFrequency: 68%

Subsets II

#74

Rank

#1036MediumFrequency: 68%

Rotting Oranges

#75

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

#76

Rank

#353MediumFrequency: 67%

Design Snake Game

Array Hash Table Design Queue Simulation

#77

Rank

#1549MediumFrequency: 67%

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#78

Rank

#283EasyFrequency: 66%

Move Zeroes

#79

Rank

#907MediumFrequency: 66%

Koko Eating Bananas

#80

Rank

#2094MediumFrequency: 66%

Remove Stones to Minimize the Total

Array Greedy Heap (Priority Queue)

#81

Rank

#128MediumFrequency: 66%

Longest Consecutive Sequence

#82

Rank

#410HardFrequency: 65%

Split Array Largest Sum

Array Binary Search Dynamic Programming Greedy Prefix Sum

#83

Rank

#78MediumFrequency: 64%

Subsets

#84

Rank

#1909MediumFrequency: 64%

Buildings With an Ocean View

#85

Rank

#35EasyFrequency: 64%

Search Insert Position

#86

Rank

#54MediumFrequency: 63%

Spiral Matrix

#87

Rank

#79MediumFrequency: 63%

Word Search

Array String Backtracking Matrix

#88

Rank

#399MediumFrequency: 63%

Evaluate Division

Array String Depth-First Search Breadth-First Search Union Find Graph Shortest Path

#89

Rank

#34MediumFrequency: 63%

Find First and Last Position of Element in Sorted Array

#90

Rank

#40MediumFrequency: 63%

Combination Sum II

#91

Rank

#244MediumFrequency: 63%

Shortest Word Distance II

Array Hash Table Two Pointers String Design

#92

Rank

#987MediumFrequency: 63%

Reveal Cards In Increasing Order

Array Queue Sorting Simulation

#93

Rank

#2695MediumFrequency: 63%

Find Score of an Array After Marking All Elements

Array Hash Table Sorting Heap (Priority Queue)Simulation

#94

Rank

#46MediumFrequency: 63%

Permutations

#95

Rank

#31MediumFrequency: 62%

Next Permutation

#96

Rank

#721MediumFrequency: 62%

Accounts Merge

Array Hash Table String Depth-First Search Breadth-First Search Union Find Sorting

#97

Rank

#777EasyFrequency: 61%

Toeplitz Matrix

Array Matrix

#98

Rank

#2868MediumFrequency: 60%

Continuous Subarrays

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#99

Rank

#15MediumFrequency: 60%

3Sum

#100

Rank

#854HardFrequency: 60%

Making A Large Island

Array Depth-First Search Breadth-First Search Union Find Matrix

#101

Rank

#1586MediumFrequency: 60%

Longest Subarray of 1's After Deleting One Element

Array Dynamic Programming Sliding Window

#102

Rank

#48MediumFrequency: 59%

Rotate Image

Array Math Matrix

#103

Rank

#118EasyFrequency: 59%

Pascal's Triangle

#104

Rank

#1705MediumFrequency: 58%

Count Unhappy Friends

Array Simulation

#105

Rank

#253MediumFrequency: 58%

Meeting Rooms II

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

#106

Rank

#11MediumFrequency: 58%

Container With Most Water

Array Two Pointers Greedy

#107

Rank

#1468EasyFrequency: 58%

Check If N and Its Double Exist

Array Hash Table Two Pointers Binary Search Sorting

#108

Rank

#139MediumFrequency: 57%

Word Break

Array Hash Table String Dynamic Programming Trie Memoization

#109

Rank

#1646EasyFrequency: 57%

Kth Missing Positive Number

#110

Rank

#523MediumFrequency: 57%

Continuous Subarray Sum

Array Hash Table Math Prefix Sum

#111

Rank

#33MediumFrequency: 57%

Search in Rotated Sorted Array

#112

Rank

#1775EasyFrequency: 57%

Design an Ordered Stream

Array Hash Table Design Data Stream

#113

Rank

#2164MediumFrequency: 56%

Two Best Non-Overlapping Events

Array Binary Search Dynamic Programming Sorting Heap (Priority Queue)

#114

Rank

#18MediumFrequency: 55%

4Sum

#115

Rank

#167MediumFrequency: 55%

Two Sum II - Input Array Is Sorted

Array Two Pointers Binary Search

#116

Rank

#169EasyFrequency: 55%

Majority Element

Array Hash Table Divide and Conquer Sorting Counting

#117

Rank

#198MediumFrequency: 55%

House Robber

#118

Rank

#213MediumFrequency: 55%

House Robber II

#119

Rank

#1147MediumFrequency: 55%

Flip Columns For Maximum Number of Equal Rows

#120

Rank

#1886MediumFrequency: 54%

Minimum Limit of Balls in a Bag

#121

Rank

#1095MediumFrequency: 54%

Two City Scheduling

Array Greedy Sorting

#122

Rank

#3643MediumFrequency: 54%

Zero Array Transformation II

Array Binary Search Prefix Sum

#123

Rank

#26EasyFrequency: 53%

Remove Duplicates from Sorted Array

#124

Rank

#1306EasyFrequency: 52%

Minimum Absolute Difference

#125

Rank

#1034HardFrequency: 50%

Subarrays with K Different Integers

Array Hash Table Sliding Window Counting

#126

Rank

#954MediumFrequency: 50%

Maximum Sum Circular Subarray

Array Divide and Conquer Dynamic Programming Queue Monotonic Queue

#127

Rank

#51HardFrequency: 48%

N-Queens

#128

Rank

#976MediumFrequency: 48%

Minimum Area Rectangle

Array Hash Table Math Geometry Sorting

#129

Rank

#2692EasyFrequency: 48%

Take Gifts From the Richest Pile

Array Heap (Priority Queue)Simulation

#130

Rank

#63MediumFrequency: 48%

Unique Paths II

#131

Rank

#238MediumFrequency: 45%

Product of Array Except Self

#132

Rank

#239HardFrequency: 45%

Sliding Window Maximum

Array Queue Sliding Window Heap (Priority Queue)Monotonic Queue

#133

Rank

#373MediumFrequency: 45%

Find K Pairs with Smallest Sums

Array Heap (Priority Queue)

#134

Rank

#498MediumFrequency: 43%

Diagonal Traverse

#135

Rank

#75MediumFrequency: 42%

Sort Colors

#136

Rank

#179MediumFrequency: 42%

Largest Number

Array String Greedy Sorting

#137

Rank

#268EasyFrequency: 42%

Missing Number

Array Hash Table Math Binary Search Bit Manipulation Sorting

#138

Rank

#300MediumFrequency: 42%

Longest Increasing Subsequence

Array Binary Search Dynamic Programming

#139

Rank

#1783MediumFrequency: 42%

Ways to Make a Fair Array

#140

Rank

#532MediumFrequency: 40%

K-diff Pairs in an Array

Array Hash Table Two Pointers Binary Search Sorting

#141

Rank

#163EasyFrequency: 37%

Missing Ranges

Array

#142

Rank

#378MediumFrequency: 37%

Kth Smallest Element in a Sorted Matrix

Array Binary Search Sorting Heap (Priority Queue)Matrix

#143

Rank

#735MediumFrequency: 37%

Asteroid Collision

Array Stack Simulation

#144

Rank

#36MediumFrequency: 36%

Valid Sudoku

#145

Rank

#80MediumFrequency: 36%

Remove Duplicates from Sorted Array II

#146

Rank

#188HardFrequency: 36%

Best Time to Buy and Sell Stock IV

#147

Rank

#1257HardFrequency: 34%

Rank Transform of a Matrix

Array Union Find Graph Topological Sort Sorting Matrix

#148

Rank

#45MediumFrequency: 33%

Jump Game II

#149

Rank

#1397MediumFrequency: 33%

Search Suggestions System

Array String Binary Search Trie Sorting Heap (Priority Queue)

#150

Rank

#2552MediumFrequency: 21%

Maximum Sum of Distinct Subarrays With Length K

Array Hash Table Sliding Window

#151

Rank

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Array Interview Questions

Master 151 array problems frequently asked in technical interviews. These questions test your understanding of arrayconcepts and are essential for coding interview success.

151

Total Problems

Easy

107

Medium

Hard

Two Sum

Rank

#3594MediumFrequency: 100%

Identify the Largest Outlier in an Array

Array Hash Table Counting Enumeration

Rank

#1352HardFrequency: 100%

Maximum Profit in Job Scheduling

Array Binary Search Dynamic Programming Sorting

Rank

#3613MediumFrequency: 100%

Maximize Amount After Two Days of Conversions

Array String Depth-First Search Breadth-First Search Graph

Rank

#1085MediumFrequency: 100%

The Earliest Moment When Everyone Become Friends

Array Union Find Sorting

Rank

#64MediumFrequency: 100%

Minimum Path Sum

Rank

#817EasyFrequency: 100%

Design HashMap

Array Hash Table Linked List Design Hash Function

Rank

#322MediumFrequency: 100%

Coin Change

Array Dynamic Programming Breadth-First Search

Rank

#42HardFrequency: 100%

Trapping Rain Water

Array Two Pointers Dynamic Programming Stack Monotonic Stack

Rank

#3681MediumFrequency: 100%

Maximum Area Rectangle With Point Constraints I

Array Math Binary Indexed Tree Segment Tree Geometry Sorting Enumeration

#10

Rank

#1056MediumFrequency: 100%

Capacity To Ship Packages Within D Days

#11

Rank

#833HardFrequency: 95%

Bus Routes

Array Hash Table Breadth-First Search

#12

Rank

#739MediumFrequency: 94%

Daily Temperatures

#13

Rank

#2891MediumFrequency: 93%

Maximum Beauty of an Array After Applying Operation

Array Binary Search Sliding Window Sorting

#14

Rank

#152MediumFrequency: 93%

Maximum Product Subarray

#15

Rank

#84HardFrequency: 93%

Largest Rectangle in Histogram

#16

Rank

#3639MediumFrequency: 93%

Zero Array Transformation I

#17

Rank

#88EasyFrequency: 92%

Merge Sorted Array

#18

Rank

#215MediumFrequency: 92%

Kth Largest Element in an Array

Array Divide and Conquer Sorting Heap (Priority Queue)Quickselect

#19

Rank

#1046MediumFrequency: 91%

Max Consecutive Ones III

Array Binary Search Sliding Window Prefix Sum

#20

Rank

#122MediumFrequency: 90%

Best Time to Buy and Sell Stock II

#21

Rank

#121EasyFrequency: 89%

Best Time to Buy and Sell Stock

#22

Rank

#136EasyFrequency: 89%

Single Number

Array Bit Manipulation

#23

Rank

#852MediumFrequency: 89%

Friends Of Appropriate Ages

Array Two Pointers Binary Search Sorting

#24

Rank

#912MediumFrequency: 87%

Random Pick with Weight

Array Math Binary Search Prefix Sum Randomized

#25

Rank

#621MediumFrequency: 85%

Task Scheduler

Array Hash Table Greedy Sorting Heap (Priority Queue)Counting

#26

Rank

#162MediumFrequency: 85%

Find Peak Element

#27

Rank

#1019EasyFrequency: 85%

Squares of a Sorted Array

#28

Rank

#134MediumFrequency: 85%

Gas Station

#29

Rank

#1330MediumFrequency: 83%

Longest Arithmetic Subsequence of Given Difference

Array Hash Table Dynamic Programming

#30

Rank

#1108MediumFrequency: 83%

Analyze User Website Visit Pattern

Array Hash Table Sorting

#31

Rank

#772MediumFrequency: 83%

Construct Quad Tree

Array Divide and Conquer Tree Matrix

#32

Rank

#3654MediumFrequency: 83%

Minimum Array Sum

#33

Rank

#200MediumFrequency: 82%

Number of Islands

Array Depth-First Search Breadth-First Search Union Find Matrix

#34

Rank

#1014MediumFrequency: 82%

K Closest Points to Origin

Array Math Divide and Conquer Geometry Sorting Heap (Priority Queue)Quickselect

#35

Rank

#560MediumFrequency: 81%

Subarray Sum Equals K

#36

Rank

#348MediumFrequency: 81%

Design Tic-Tac-Toe

Array Hash Table Design Matrix Simulation

#37

Rank

#733EasyFrequency: 81%

Flood Fill

Array Depth-First Search Breadth-First Search Matrix

#38

Rank

#27EasyFrequency: 80%

Remove Element

#39

Rank

#53MediumFrequency: 79%

Maximum Subarray

Array Divide and Conquer Dynamic Programming

#40

Rank

#269HardFrequency: 79%

Alien Dictionary

Array String Depth-First Search Breadth-First Search Graph Topological Sort

#41

Rank

#305HardFrequency: 79%

Number of Islands II

#42

Rank

#362MediumFrequency: 79%

Design Hit Counter

Array Binary Search Design Queue Data Stream

#43

Rank

#380MediumFrequency: 79%

Insert Delete GetRandom O(1)

#44

Rank

#1966MediumFrequency: 79%

Frequency of the Most Frequent Element

Array Binary Search Greedy Sliding Window Sorting Prefix Sum

#45

Rank

#329HardFrequency: 79%

Longest Increasing Path in a Matrix

Array Dynamic Programming Depth-First Search Breadth-First Search Graph Topological Sort Memoization Matrix

#46

Rank

#4HardFrequency: 79%

Median of Two Sorted Arrays

Array Binary Search Divide and Conquer

#47

Rank

#74MediumFrequency: 78%

Search a 2D Matrix

Array Binary Search Matrix

#48

Rank

#356MediumFrequency: 77%

Line Reflection

Array Hash Table Math

#49

Rank

#347MediumFrequency: 76%

Top K Frequent Elements

Array Hash Table Divide and Conquer Sorting Heap (Priority Queue)Bucket Sort Counting Quickselect

#50

Rank

#1713MediumFrequency: 76%

Dot Product of Two Sparse Vectors

Array Hash Table Two Pointers Design

#51

Rank

#2267HardFrequency: 76%

Minimum Difference in Sums After Removal of Elements

Array Dynamic Programming Heap (Priority Queue)

#52

Rank

#2232MediumFrequency: 76%

Adding Spaces to a String

Array Two Pointers String Simulation

#53

Rank

#1478MediumFrequency: 76%

Maximum Number of Events That Can Be Attended

Array Greedy Sorting Heap (Priority Queue)

#54

Rank

#66EasyFrequency: 76%

Plus One

Array Math

#55

Rank

#249MediumFrequency: 76%

Group Shifted Strings

Array Hash Table String

#56

Rank

#3555EasyFrequency: 76%

Final Array State After K Multiplication Operations I

Array Math Heap (Priority Queue)Simulation

#57

Rank

#41HardFrequency: 74%

First Missing Positive

#58

Rank

#39MediumFrequency: 74%

Combination Sum

#59

Rank

#346EasyFrequency: 74%

Moving Average from Data Stream

Array Design Queue Data Stream

#60

Rank

#55MediumFrequency: 73%

Jump Game

#61

Rank

#2089MediumFrequency: 73%

Maximum Matrix Sum

Array Greedy Matrix

#62

Rank

#2711HardFrequency: 73%

Minimum Time to Visit a Cell In a Grid

Array Breadth-First Search Graph Heap (Priority Queue)Matrix Shortest Path

#63

Rank

#49MediumFrequency: 72%

Group Anagrams

Array Hash Table String Sorting

#64

Rank

#56MediumFrequency: 72%

Merge Intervals

#65

Rank

#381HardFrequency: 72%

Insert Delete GetRandom O(1) - Duplicates allowed

#66

Rank

#605EasyFrequency: 72%

Can Place Flowers

#67

Rank

#658MediumFrequency: 72%

Find K Closest Elements

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

#68

Rank

#325MediumFrequency: 71%

Maximum Size Subarray Sum Equals k

#69

Rank

#1028MediumFrequency: 69%

Interval List Intersections

#70

Rank

#1171MediumFrequency: 69%

Shortest Path in Binary Matrix

#71

Rank

#753MediumFrequency: 69%

Open the Lock

Array Hash Table String Breadth-First Search

#72

Rank

#518MediumFrequency: 69%

Coin Change II

#73

Rank

#90MediumFrequency: 68%

Subsets II

#74

Rank

#1036MediumFrequency: 68%

Rotting Oranges

#75

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

#76

Rank

#353MediumFrequency: 67%

Design Snake Game

Array Hash Table Design Queue Simulation

#77

Rank

#1549MediumFrequency: 67%

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#78

Rank

#283EasyFrequency: 66%

Move Zeroes

#79

Rank

#907MediumFrequency: 66%

Koko Eating Bananas

#80

Rank

#2094MediumFrequency: 66%

Remove Stones to Minimize the Total

Array Greedy Heap (Priority Queue)

#81

Rank

#128MediumFrequency: 66%

Longest Consecutive Sequence

#82

Rank

#410HardFrequency: 65%

Split Array Largest Sum

Array Binary Search Dynamic Programming Greedy Prefix Sum

#83

Rank

#78MediumFrequency: 64%

Subsets

#84

Rank

#1909MediumFrequency: 64%

Buildings With an Ocean View

#85

Rank

#35EasyFrequency: 64%

Search Insert Position

#86

Rank

#54MediumFrequency: 63%

Spiral Matrix

#87

Rank

#79MediumFrequency: 63%

Word Search

Array String Backtracking Matrix

#88

Rank

#399MediumFrequency: 63%

Evaluate Division

Array String Depth-First Search Breadth-First Search Union Find Graph Shortest Path

#89

Rank

#34MediumFrequency: 63%

Find First and Last Position of Element in Sorted Array

#90

Rank

#40MediumFrequency: 63%

Combination Sum II

#91

Rank

#244MediumFrequency: 63%

Shortest Word Distance II

Array Hash Table Two Pointers String Design

#92

Rank

#987MediumFrequency: 63%

Reveal Cards In Increasing Order

Array Queue Sorting Simulation

#93

Rank

#2695MediumFrequency: 63%

Find Score of an Array After Marking All Elements

Array Hash Table Sorting Heap (Priority Queue)Simulation

#94

Rank

#46MediumFrequency: 63%

Permutations

#95

Rank

#31MediumFrequency: 62%

Next Permutation

#96

Rank

#721MediumFrequency: 62%

Accounts Merge

Array Hash Table String Depth-First Search Breadth-First Search Union Find Sorting

#97

Rank

#777EasyFrequency: 61%

Toeplitz Matrix

Array Matrix

#98

Rank

#2868MediumFrequency: 60%

Continuous Subarrays

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#99

Rank

#15MediumFrequency: 60%

3Sum

#100

Rank

#854HardFrequency: 60%

Making A Large Island

Array Depth-First Search Breadth-First Search Union Find Matrix

#101

Rank

#1586MediumFrequency: 60%

Longest Subarray of 1's After Deleting One Element

Array Dynamic Programming Sliding Window

#102

Rank

#48MediumFrequency: 59%

Rotate Image

Array Math Matrix

#103

Rank

#118EasyFrequency: 59%

Pascal's Triangle

#104

Rank

#1705MediumFrequency: 58%

Count Unhappy Friends

Array Simulation

#105

Rank

#253MediumFrequency: 58%

Meeting Rooms II

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

#106

Rank

#11MediumFrequency: 58%

Container With Most Water

Array Two Pointers Greedy

#107

Rank

#1468EasyFrequency: 58%

Check If N and Its Double Exist

Array Hash Table Two Pointers Binary Search Sorting

#108

Rank

#139MediumFrequency: 57%

Word Break

Array Hash Table String Dynamic Programming Trie Memoization

#109

Rank

#1646EasyFrequency: 57%

Kth Missing Positive Number

#110

Rank

#523MediumFrequency: 57%

Continuous Subarray Sum

Array Hash Table Math Prefix Sum

#111

Rank

#33MediumFrequency: 57%

Search in Rotated Sorted Array

#112

Rank

#1775EasyFrequency: 57%

Design an Ordered Stream

Array Hash Table Design Data Stream

#113

Rank

#2164MediumFrequency: 56%

Two Best Non-Overlapping Events

Array Binary Search Dynamic Programming Sorting Heap (Priority Queue)

#114

Rank

#18MediumFrequency: 55%

4Sum

#115

Rank

#167MediumFrequency: 55%

Two Sum II - Input Array Is Sorted

Array Two Pointers Binary Search

#116

Rank

#169EasyFrequency: 55%

Majority Element

Array Hash Table Divide and Conquer Sorting Counting

#117

Rank

#198MediumFrequency: 55%

House Robber

#118

Rank

#213MediumFrequency: 55%

House Robber II

#119

Rank

#1147MediumFrequency: 55%

Flip Columns For Maximum Number of Equal Rows

#120

Rank

#1886MediumFrequency: 54%

Minimum Limit of Balls in a Bag

#121

Rank

#1095MediumFrequency: 54%

Two City Scheduling

Array Greedy Sorting

#122

Rank

#3643MediumFrequency: 54%

Zero Array Transformation II

Array Binary Search Prefix Sum

#123

Rank

#26EasyFrequency: 53%

Remove Duplicates from Sorted Array

#124

Rank

#1306EasyFrequency: 52%

Minimum Absolute Difference

#125

Rank

#1034HardFrequency: 50%

Subarrays with K Different Integers

Array Hash Table Sliding Window Counting

#126

Rank

#954MediumFrequency: 50%

Maximum Sum Circular Subarray

Array Divide and Conquer Dynamic Programming Queue Monotonic Queue

#127

Rank

#51HardFrequency: 48%

N-Queens

#128

Rank

#976MediumFrequency: 48%

Minimum Area Rectangle

Array Hash Table Math Geometry Sorting

#129

Rank

#2692EasyFrequency: 48%

Take Gifts From the Richest Pile

Array Heap (Priority Queue)Simulation

#130

Rank

#63MediumFrequency: 48%

Unique Paths II

#131

Rank

#238MediumFrequency: 45%

Product of Array Except Self

#132

Rank

#239HardFrequency: 45%

Sliding Window Maximum

Array Queue Sliding Window Heap (Priority Queue)Monotonic Queue

#133

Rank

#373MediumFrequency: 45%

Find K Pairs with Smallest Sums

Array Heap (Priority Queue)

#134

Rank

#498MediumFrequency: 43%

Diagonal Traverse

#135

Rank

#75MediumFrequency: 42%

Sort Colors

#136

Rank

#179MediumFrequency: 42%

Largest Number

Array String Greedy Sorting

#137

Rank

#268EasyFrequency: 42%

Missing Number

Array Hash Table Math Binary Search Bit Manipulation Sorting

#138

Rank

#300MediumFrequency: 42%

Longest Increasing Subsequence

Array Binary Search Dynamic Programming

#139

Rank

#1783MediumFrequency: 42%

Ways to Make a Fair Array

#140

Rank

#532MediumFrequency: 40%

K-diff Pairs in an Array

Array Hash Table Two Pointers Binary Search Sorting

#141

Rank

#163EasyFrequency: 37%

Missing Ranges

Array

#142

Rank

#378MediumFrequency: 37%

Kth Smallest Element in a Sorted Matrix

Array Binary Search Sorting Heap (Priority Queue)Matrix

#143

Rank

#735MediumFrequency: 37%

Asteroid Collision

Array Stack Simulation

#144

Rank

#36MediumFrequency: 36%

Valid Sudoku

#145

Rank

#80MediumFrequency: 36%

Remove Duplicates from Sorted Array II

#146

Rank

#188HardFrequency: 36%

Best Time to Buy and Sell Stock IV

#147

Rank

#1257HardFrequency: 34%

Rank Transform of a Matrix

Array Union Find Graph Topological Sort Sorting Matrix

#148

Rank

#45MediumFrequency: 33%

Jump Game II

#149

Rank

#1397MediumFrequency: 33%

Search Suggestions System

Array String Binary Search Trie Sorting Heap (Priority Queue)

#150

Rank

#2552MediumFrequency: 21%

Maximum Sum of Distinct Subarrays With Length K