Solutions & Explanations

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

4,029 Solutions961 Easy2102 Medium966 Hard

Title	Difficulty	Acceptance	Topics	Solution
1607. Sellers With No Sales	Easy	54.4%	Database	Read
1608. Special Array With X Elements Greater Than or Equal X	Easy	66.8%	Array Binary Search+1	Read
1614. Maximum Nesting Depth of the Parentheses	Easy	84.8%	Stack String	Read
1619. Mean of Array After Removing Some Elements	Easy	72.2%	Array Sorting	Read
1623. All Valid Triplets That Can Represent a Country	Easy	81.8%	Database	Read
1624. Largest Substring Between Two Equal Characters	Easy	68.5%	Hash Table String	Read
1629. Slowest Key	Easy	59.7%	Array String	Read
1633. Percentage of Users Attended a Contest	Easy	58.6%	Database	Read
1636. Sort Array by Increasing Frequency	Easy	80.8%	Array Hash Table+1	Read
1637. Widest Vertical Area Between Two Points Containing No Points	Easy	87.3%	Array Sorting	Read
1640. Check Array Formation Through Concatenation	Easy	57.3%	Array Hash Table	Read
1646. Get Maximum in Generated Array	Easy	51.4%	Array Simulation	Read
1652. Defuse the Bomb	Easy	79.2%	Array Sliding Window	Read
1656. Design an Ordered Stream	Easy	82.6%	Array Data Stream+2	Read
1661. Average Time of Process per Machine	Easy	68.7%	Database	Read
1662. Check If Two String Arrays are Equivalent	Easy	86.2%	Array String	Read
1667. Fix Names in a Table	Easy	61.3%	Database	Read
1668. Maximum Repeating Substring	Easy	41.9%	Dynamic Programming String+1	Read
1672. Richest Customer Wealth	Easy	88.9%	Array Matrix	Read
1677. Product's Worth Over Invoices	Easy	38.2%	Database	Read
1678. Goal Parser Interpretation	Easy	88.0%	String	Read
1683. Invalid Tweets	Easy	85.6%	Database	Read
1684. Count the Number of Consistent Strings	Easy	88.1%	Array Bit Manipulation+3	Read
1688. Count of Matches in Tournament	Easy	86.4%	Math Simulation	Read
1693. Daily Leads and Partners	Easy	86.6%	Database	Read
1694. Reformat Phone Number	Easy	67.7%	String	Read
1700. Number of Students Unable to Eat Lunch	Easy	79.5%	Array Queue+2	Read
1704. Determine if String Halves Are Alike	Easy	78.6%	Counting String	Read
1708. Largest Subarray Length K	Easy	65.7%	Array Greedy	Read
1710. Maximum Units on a Truck	Easy	75.3%	Array Greedy+1	Read
1716. Calculate Money in Leetcode Bank	Easy	82.4%	Math	Read
1720. Decode XORed Array	Easy	87.3%	Array Bit Manipulation	Read
1725. Number Of Rectangles That Can Form The Largest Square	Easy	79.5%	Array	Read
1729. Find Followers Count	Easy	69.3%	Database	Read
1731. The Number of Employees Which Report to Each Employee	Easy	50.6%	Database	Read
1732. Find the Highest Altitude	Easy	84.7%	Array Prefix Sum	Read
1736. Latest Time by Replacing Hidden Digits	Easy	43.7%	Greedy String	Read
1741. Find Total Time Spent by Each Employee	Easy	86.9%	Database	Read
1742. Maximum Number of Balls in a Box	Easy	74.8%	Counting Hash Table+1	Read
1748. Sum of Unique Elements	Easy	80.4%	Array Counting+1	Read
1752. Check if Array Is Sorted and Rotated	Easy	57.3%	Array	Read
1757. Recyclable and Low Fat Products	Easy	89.3%	Database	Read
1758. Minimum Changes To Make Alternating Binary String	Easy	67.8%	String	Read
1763. Longest Nice Substring	Easy	64.4%	Bit Manipulation Divide and Conquer+3	Read
1768. Merge Strings Alternately	Easy	82.1%	String Two Pointers	Read
1773. Count Items Matching a Rule	Easy	85.3%	Array String	Read
1777. Product's Price for Each Store	Easy	82.3%	Database	Read
1779. Find Nearest Point That Has the Same X or Y Coordinate	Easy	69.9%	Array	Read
1784. Check if Binary String Has at Most One Segment of Ones	Easy	49.0%	String	Read
1789. Primary Department for Each Employee	Easy	68.1%	Database	Read

#1607Easy

Sellers With No Sales

Database

Acceptance: 54.4%

#1608Easy

Special Array With X Elements Greater Than or Equal X

ArrayBinary SearchSorting

Acceptance: 66.8%

#1614Easy

Maximum Nesting Depth of the Parentheses

StackString

Acceptance: 84.8%

#1619Easy

Mean of Array After Removing Some Elements

ArraySorting

Acceptance: 72.2%

#1623Easy

All Valid Triplets That Can Represent a Country

Database

Acceptance: 81.8%

#1624Easy

Largest Substring Between Two Equal Characters

Hash TableString

Acceptance: 68.5%

#1629Easy

Slowest Key

ArrayString

Acceptance: 59.7%

#1633Easy

Percentage of Users Attended a Contest

Database

Acceptance: 58.6%

#1636Easy

Sort Array by Increasing Frequency

ArrayHash TableSorting

Acceptance: 80.8%

#1637Easy

Widest Vertical Area Between Two Points Containing No Points

ArraySorting

Acceptance: 87.3%

#1640Easy

Check Array Formation Through Concatenation

ArrayHash Table

Acceptance: 57.3%

#1646Easy

Get Maximum in Generated Array

ArraySimulation

Acceptance: 51.4%

#1652Easy

Defuse the Bomb

ArraySliding Window

Acceptance: 79.2%

#1656Easy

Design an Ordered Stream

ArrayData StreamDesign+1

Acceptance: 82.6%

#1661Easy

Average Time of Process per Machine

Database

Acceptance: 68.7%

#1662Easy

Check If Two String Arrays are Equivalent

ArrayString

Acceptance: 86.2%

#1667Easy

Fix Names in a Table

Database

Acceptance: 61.3%

#1668Easy

Maximum Repeating Substring

Dynamic ProgrammingStringString Matching

Acceptance: 41.9%

#1672Easy

Richest Customer Wealth

ArrayMatrix

Acceptance: 88.9%

#1677Easy

Product's Worth Over Invoices

Database

Acceptance: 38.2%

#1678Easy

Goal Parser Interpretation

String

Acceptance: 88.0%

#1683Easy

Invalid Tweets

Database

Acceptance: 85.6%

#1684Easy

Count the Number of Consistent Strings

ArrayBit ManipulationCounting+2

Acceptance: 88.1%

#1688Easy

Count of Matches in Tournament

MathSimulation

Acceptance: 86.4%

#1693Easy

Daily Leads and Partners

Database

Acceptance: 86.6%

#1694Easy

Reformat Phone Number

String

Acceptance: 67.7%

#1700Easy

Number of Students Unable to Eat Lunch

ArrayQueueSimulation+1

Acceptance: 79.5%

#1704Easy

Determine if String Halves Are Alike

CountingString

Acceptance: 78.6%

#1708Easy

Largest Subarray Length K

ArrayGreedy

Acceptance: 65.7%

#1710Easy

Maximum Units on a Truck

ArrayGreedySorting

Acceptance: 75.3%

#1716Easy

Calculate Money in Leetcode Bank

Math

Acceptance: 82.4%

#1720Easy

Decode XORed Array

ArrayBit Manipulation

Acceptance: 87.3%

#1725Easy

Number Of Rectangles That Can Form The Largest Square

Array

Acceptance: 79.5%

#1729Easy

Find Followers Count

Database

Acceptance: 69.3%

#1731Easy

The Number of Employees Which Report to Each Employee

Database

Acceptance: 50.6%

#1732Easy

Find the Highest Altitude

ArrayPrefix Sum

Acceptance: 84.7%

#1736Easy

Latest Time by Replacing Hidden Digits

GreedyString

Acceptance: 43.7%

#1741Easy

Find Total Time Spent by Each Employee

Database

Acceptance: 86.9%

#1742Easy

Maximum Number of Balls in a Box

CountingHash TableMath

Acceptance: 74.8%

#1748Easy

Sum of Unique Elements

ArrayCountingHash Table

Acceptance: 80.4%

#1752Easy

Check if Array Is Sorted and Rotated

Array

Acceptance: 57.3%

#1757Easy

Recyclable and Low Fat Products

Database

Acceptance: 89.3%

#1758Easy

Minimum Changes To Make Alternating Binary String

String

Acceptance: 67.8%

#1763Easy

Longest Nice Substring

Bit ManipulationDivide and ConquerHash Table+2

Acceptance: 64.4%

#1768Easy

Merge Strings Alternately

StringTwo Pointers

Acceptance: 82.1%

#1773Easy

Count Items Matching a Rule

ArrayString

Acceptance: 85.3%

#1777Easy

Product's Price for Each Store

Database

Acceptance: 82.3%

#1779Easy

Find Nearest Point That Has the Same X or Y Coordinate

Array

Acceptance: 69.9%

#1784Easy

Check if Binary String Has at Most One Segment of Ones

String

Acceptance: 49.0%

#1789Easy

Primary Department for Each Employee

Database

Acceptance: 68.1%

1 2 38 9 1018 19 20

Page 9 of 20

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
Understand the complexity: Pay attention to time and space analysis for each approach
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