Solutions & Explanations

Browse 4,029+ detailed solutions with multiple approaches, code in Python, Java, C++ and more.

4,029 Solutions961 Easy2102 Medium966 Hard

All4029 Easy961 Medium2102 Hard966

Title	Difficulty	Acceptance	Topics	Solution
1422. Maximum Score After Splitting a String	Easy	65.1%	Prefix Sum String	Read
1426. Counting Elements	Easy	60.3%	Array Hash Table	Read
1427. Perform String Shifts	Easy	56.0%	Array Math+1	Read
1431. Kids With the Greatest Number of Candies	Easy	87.8%	Array	Read
1435. Create a Session Bar Chart	Easy	74.9%	Database	Read
1436. Destination City	Easy	79.5%	Array Hash Table+1	Read
1437. Check If All 1's Are at Least Length K Places Away	Easy	64.3%	Array	Read
1446. Consecutive Characters	Easy	60.1%	String	Read
1450. Number of Students Doing Homework at a Given Time	Easy	76.3%	Array	Read
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	68.8%	String String Matching+1	Read
1460. Make Two Arrays Equal by Reversing Subarrays	Easy	75.9%	Array Hash Table+1	Read
1464. Maximum Product of Two Elements in an Array	Easy	84.7%	Array Heap (Priority Queue)+1	Read
1469. Find All The Lonely Nodes	Easy	83.8%	Binary Tree Breadth-First Search+2	Read
1470. Shuffle the Array	Easy	88.7%	Array	Read
1474. Delete N Nodes After M Nodes of a Linked List	Easy	74.4%	Linked List	Read
1475. Final Prices With a Special Discount in a Shop	Easy	84.1%	Array Monotonic Stack+1	Read
1480. Running Sum of 1d Array	Easy	86.9%	Array Prefix Sum	Read
1484. Group Sold Products By The Date	Easy	77.5%	Database	Read
1486. XOR Operation in an Array	Easy	87.5%	Bit Manipulation Math	Read
1491. Average Salary Excluding the Minimum and Maximum Salary	Easy	63.5%	Array Sorting	Read
1495. Friendly Movies Streamed Last Month	Easy	49.0%	Database	Read
1496. Path Crossing	Easy	62.5%	Hash Table String	Read
1502. Can Make Arithmetic Progression From Sequence	Easy	68.9%	Array Sorting	Read
1507. Reformat Date	Easy	69.0%	String	Read
1511. Customer Order Frequency	Easy	67.3%	Database	Read
1512. Number of Good Pairs	Easy	89.9%	Array Counting+2	Read
1517. Find Users With Valid E-Mails	Easy	44.0%	Database	Read
1518. Water Bottles	Easy	72.6%	Math Simulation	Read
1523. Count Odd Numbers in an Interval Range	Easy	54.4%	Math	Read
1527. Patients With a Condition	Easy	40.0%	Database	Read
1528. Shuffle String	Easy	85.5%	Array String	Read
1534. Count Good Triplets	Easy	85.5%	Array Enumeration	Read
1539. Kth Missing Positive Number	Easy	63.9%	Array Binary Search	Read
1543. Fix Product Name Format	Easy	59.1%	Database	Read
1544. Make The String Great	Easy	68.2%	Stack String	Read
1550. Three Consecutive Odds	Easy	69.3%	Array	Read
1556. Thousand Separator	Easy	53.7%	String	Read
1560. Most Visited Sector in a Circular Track	Easy	59.9%	Array Simulation	Read
1565. Unique Orders and Customers Per Month	Easy	82.1%	Database	Read
1566. Detect Pattern of Length M Repeated K or More Times	Easy	43.9%	Array Enumeration	Read
1571. Warehouse Manager	Easy	87.5%	Database	Read
1572. Matrix Diagonal Sum	Easy	84.2%	Array Matrix	Read
1576. Replace All ?'s to Avoid Consecutive Repeating Characters	Easy	45.7%	String	Read
1581. Customer Who Visited but Did Not Make Any Transactions	Easy	67.7%	Database	Read
1582. Special Positions in a Binary Matrix	Easy	72.6%	Array Matrix	Read
1587. Bank Account Summary II	Easy	83.4%	Database	Read
1588. Sum of All Odd Length Subarrays	Easy	84.0%	Array Math+1	Read
1592. Rearrange Spaces Between Words	Easy	43.9%	String	Read
1598. Crawler Log Folder	Easy	71.7%	Array Stack+1	Read
1603. Design Parking System	Easy	87.2%	Counting Design+1	Read

Maximum Score After Splitting a String

Prefix SumString

Acceptance: 65.1%

Counting Elements

ArrayHash Table

Acceptance: 60.3%

Perform String Shifts

ArrayMathString

Acceptance: 56.0%

Kids With the Greatest Number of Candies

Acceptance: 87.8%

Create a Session Bar Chart

Acceptance: 74.9%

Destination City

ArrayHash TableString

Acceptance: 79.5%

Check If All 1's Are at Least Length K Places Away

Acceptance: 64.3%

Consecutive Characters

Acceptance: 60.1%

Number of Students Doing Homework at a Given Time

Acceptance: 76.3%

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

StringString MatchingTwo Pointers

Acceptance: 68.8%

Make Two Arrays Equal by Reversing Subarrays

ArrayHash TableSorting

Acceptance: 75.9%

Maximum Product of Two Elements in an Array

ArrayHeap (Priority Queue)Sorting

Acceptance: 84.7%

Find All The Lonely Nodes

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 83.8%

Shuffle the Array

Acceptance: 88.7%

Delete N Nodes After M Nodes of a Linked List

Acceptance: 74.4%

Final Prices With a Special Discount in a Shop

ArrayMonotonic StackStack

Acceptance: 84.1%

Running Sum of 1d Array

ArrayPrefix Sum

Acceptance: 86.9%

Group Sold Products By The Date

Acceptance: 77.5%

XOR Operation in an Array

Bit ManipulationMath

Acceptance: 87.5%

Average Salary Excluding the Minimum and Maximum Salary

Acceptance: 63.5%

Friendly Movies Streamed Last Month

Acceptance: 49.0%

Path Crossing

Hash TableString

Acceptance: 62.5%

Can Make Arithmetic Progression From Sequence

Acceptance: 68.9%

Reformat Date

Acceptance: 69.0%

Customer Order Frequency

Acceptance: 67.3%

Number of Good Pairs

ArrayCountingHash Table+1

Acceptance: 89.9%

Find Users With Valid E-Mails

Acceptance: 44.0%

Water Bottles

Acceptance: 72.6%

Count Odd Numbers in an Interval Range

Acceptance: 54.4%

Patients With a Condition

Acceptance: 40.0%

Shuffle String

Acceptance: 85.5%

Count Good Triplets

ArrayEnumeration

Acceptance: 85.5%

Kth Missing Positive Number

ArrayBinary Search

Acceptance: 63.9%

Fix Product Name Format

Acceptance: 59.1%

Make The String Great

Acceptance: 68.2%

Three Consecutive Odds

Acceptance: 69.3%

Thousand Separator

Acceptance: 53.7%

Most Visited Sector in a Circular Track

ArraySimulation

Acceptance: 59.9%

Unique Orders and Customers Per Month

Acceptance: 82.1%

Detect Pattern of Length M Repeated K or More Times

ArrayEnumeration

Acceptance: 43.9%

Warehouse Manager

Acceptance: 87.5%

Matrix Diagonal Sum

Acceptance: 84.2%

Replace All ?'s to Avoid Consecutive Repeating Characters

Acceptance: 45.7%

Customer Who Visited but Did Not Make Any Transactions

Acceptance: 67.7%

Special Positions in a Binary Matrix

Acceptance: 72.6%

Bank Account Summary II

Acceptance: 83.4%

Sum of All Odd Length Subarrays

ArrayMathPrefix Sum

Acceptance: 84.0%

Rearrange Spaces Between Words

Acceptance: 43.9%

Crawler Log Folder

ArrayStackString

Acceptance: 71.7%

Design Parking System

CountingDesignSimulation

Acceptance: 87.2%

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Master DSA with Step-by-Step Solutions

Each solution article on FleetCode breaks down the problem into multiple approaches, from brute force to optimal, with detailed explanations and code in Python, Java, C++ and more. Understanding why an approach works - not just copying code - is what separates candidates who clear interviews from those who don't.

How to Use These Solutions

Try the problem first: Spend at least 20 minutes before reading the solution
Read all approaches: Start from brute force to understand the problem fully, then study the optimized solution
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Code it yourself: After understanding the approach, close the solution and implement from memory
Revisit after a week: Spaced repetition helps retain problem-solving patterns