Solutions & Explanations

Browse 4,030+ detailed solutions with multiple approaches, code in Python, Java, C++ and more.

4,030 Solutions961 Easy2102 Medium967 Hard

Title	Difficulty	Acceptance	Topics	Solution
2401. Longest Nice Subarray	Medium	64.8%	Array Bit Manipulation+1	Read
2402. Meeting Rooms III	Hard	51.6%	Array Hash Table+3	Read
2403. Minimum Time to Kill All Monsters	Hard	56.3%	Array Bit Manipulation+2	Read
2404. Most Frequent Even Element	Easy	54.0%	Array Counting+1	Read
2405. Optimal Partition of String	Medium	78.0%	Greedy Hash Table+1	Read
2406. Divide Intervals Into Minimum Number of Groups	Medium	63.7%	Array Greedy+4	Read
2407. Longest Increasing Subsequence II	Hard	26.1%	Array Binary Indexed Tree+5	Read
2408. Design SQL	Medium	63.9%	Array Design+2	Read
2409. Count Days Spent Together	Easy	48.3%	Math String	Read
2410. Maximum Matching of Players With Trainers	Medium	75.2%	Array Greedy+2	Read
2411. Smallest Subarrays With Maximum Bitwise OR	Medium	62.0%	Array Binary Search+2	Read
2412. Minimum Money Required Before Transactions	Hard	42.1%	Array Greedy+1	Read
2413. Smallest Even Multiple	Easy	88.5%	Math Number Theory	Read
2414. Length of the Longest Alphabetical Continuous Substring	Medium	61.0%	String	Read
2415. Reverse Odd Levels of Binary Tree	Medium	86.7%	Binary Tree Breadth-First Search+2	Read
2416. Sum of Prefix Scores of Strings	Hard	60.6%	Array Counting+2	Read
2417. Closest Fair Integer	Medium	43.7%	Enumeration Math	Read
2418. Sort the People	Easy	84.9%	Array Hash Table+2	Read
2419. Longest Subarray With Maximum Bitwise AND	Medium	65.4%	Array Bit Manipulation+1	Read
2420. Find All Good Indices	Medium	40.8%	Array Dynamic Programming+1	Read
2421. Number of Good Paths	Hard	56.7%	Array Graph+4	Read
2422. Merge Operations to Turn Array Into a Palindrome	Medium	69.0%	Array Greedy+1	Read
2423. Remove Letter To Equalize Frequency	Easy	19.3%	Counting Hash Table+1	Read
2424. Longest Uploaded Prefix	Medium	55.5%	Binary Indexed Tree Binary Search+5	Read
2425. Bitwise XOR of All Pairings	Medium	66.9%	Array Bit Manipulation+1	Read
2426. Number of Pairs Satisfying Inequality	Hard	47.6%	Array Binary Indexed Tree+5	Read
2427. Number of Common Factors	Easy	80.0%	Enumeration Math+1	Read
2428. Maximum Sum of an Hourglass	Medium	77.1%	Array Matrix+1	Read
2429. Minimize XOR	Medium	62.4%	Bit Manipulation Greedy	Read
2430. Maximum Deletions on a String	Hard	36.4%	Dynamic Programming Hash Function+3	Read
2431. Maximize Total Tastiness of Purchased Fruits	Medium	64.6%	Array Dynamic Programming	Read
2432. The Employee That Worked on the Longest Task	Easy	51.5%	Array	Read
2433. Find The Original Array of Prefix Xor	Medium	88.0%	Array Bit Manipulation	Read
2434. Using a Robot to Print the Lexicographically Smallest String	Medium	62.5%	Greedy Hash Table+2	Read
2435. Paths in Matrix Whose Sum Is Divisible by K	Hard	58.7%	Array Dynamic Programming+1	Read
2436. Minimum Split Into Subarrays With GCD Greater Than One	Medium	70.2%	Array Dynamic Programming+3	Read
2437. Number of Valid Clock Times	Easy	47.9%	Enumeration String	Read
2438. Range Product Queries of Powers	Medium	61.4%	Array Bit Manipulation+1	Read
2439. Minimize Maximum of Array	Medium	46.4%	Array Binary Search+3	Read
2440. Create Components With Same Value	Hard	54.0%	Array Depth-First Search+3	Read
2441. Largest Positive Integer That Exists With Its Negative	Easy	74.9%	Array Hash Table+2	Read
2442. Count Number of Distinct Integers After Reverse Operations	Medium	81.4%	Array Counting+2	Read
2443. Sum of Number and Its Reverse	Medium	50.0%	Enumeration Math	Read
2444. Count Subarrays With Fixed Bounds	Hard	69.2%	Array Monotonic Queue+2	Read
2445. Number of Nodes With Value One	Medium	66.3%	Binary Tree Breadth-First Search+2	Read
2446. Determine if Two Events Have Conflict	Easy	53.1%	Array String	Read
2447. Number of Subarrays With GCD Equal to K	Medium	53.3%	Array Math+1	Read
2448. Minimum Cost to Make Array Equal	Hard	46.7%	Array Binary Search+3	Read
2449. Minimum Number of Operations to Make Arrays Similar	Hard	61.8%	Array Greedy+1	Read
2450. Number of Distinct Binary Strings After Applying Operations	Medium	63.0%	Math String	Read

#2401Medium

Longest Nice Subarray

ArrayBit ManipulationSliding Window

Acceptance: 64.8%

#2402Hard

Meeting Rooms III

ArrayHash TableHeap (Priority Queue)+2

Acceptance: 51.6%

#2403Hard

Minimum Time to Kill All Monsters

ArrayBit ManipulationBitmask+1

Acceptance: 56.3%

#2404Easy

Most Frequent Even Element

ArrayCountingHash Table

Acceptance: 54.0%

#2405Medium

Optimal Partition of String

GreedyHash TableString

Acceptance: 78.0%

#2406Medium

Divide Intervals Into Minimum Number of Groups

ArrayGreedyHeap (Priority Queue)+3

Acceptance: 63.7%

#2407Hard

Longest Increasing Subsequence II

ArrayBinary Indexed TreeDivide and Conquer+4

Acceptance: 26.1%

#2408Medium

Design SQL

ArrayDesignHash Table+1

Acceptance: 63.9%

#2409Easy

Count Days Spent Together

MathString

Acceptance: 48.3%

#2410Medium

Maximum Matching of Players With Trainers

ArrayGreedySorting+1

Acceptance: 75.2%

#2411Medium

Smallest Subarrays With Maximum Bitwise OR

ArrayBinary SearchBit Manipulation+1

Acceptance: 62.0%

#2412Hard

Minimum Money Required Before Transactions

ArrayGreedySorting

Acceptance: 42.1%

#2413Easy

Smallest Even Multiple

MathNumber Theory

Acceptance: 88.5%

#2414Medium

Length of the Longest Alphabetical Continuous Substring

String

Acceptance: 61.0%

#2415Medium

Reverse Odd Levels of Binary Tree

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 86.7%

#2416Hard

Sum of Prefix Scores of Strings

ArrayCountingString+1

Acceptance: 60.6%

#2417Medium

Closest Fair Integer

EnumerationMath

Acceptance: 43.7%

#2418Easy

Sort the People

ArrayHash TableSorting+1

Acceptance: 84.9%

#2419Medium

Longest Subarray With Maximum Bitwise AND

ArrayBit ManipulationBrainteaser

Acceptance: 65.4%

#2420Medium

Find All Good Indices

ArrayDynamic ProgrammingPrefix Sum

Acceptance: 40.8%

#2421Hard

Number of Good Paths

ArrayGraphHash Table+3

Acceptance: 56.7%

#2422Medium

Merge Operations to Turn Array Into a Palindrome

ArrayGreedyTwo Pointers

Acceptance: 69.0%

#2423Easy

Remove Letter To Equalize Frequency

CountingHash TableString

Acceptance: 19.3%

#2424Medium

Longest Uploaded Prefix

Binary Indexed TreeBinary SearchDesign+4

Acceptance: 55.5%

#2425Medium

Bitwise XOR of All Pairings

ArrayBit ManipulationBrainteaser

Acceptance: 66.9%

#2426Hard

Number of Pairs Satisfying Inequality

ArrayBinary Indexed TreeBinary Search+4

Acceptance: 47.6%

#2427Easy

Number of Common Factors

EnumerationMathNumber Theory

Acceptance: 80.0%

#2428Medium

Maximum Sum of an Hourglass

ArrayMatrixPrefix Sum

Acceptance: 77.1%

#2429Medium

Minimize XOR

Bit ManipulationGreedy

Acceptance: 62.4%

#2430Hard

Maximum Deletions on a String

Dynamic ProgrammingHash FunctionRolling Hash+2

Acceptance: 36.4%

#2431Medium

Maximize Total Tastiness of Purchased Fruits

ArrayDynamic Programming

Acceptance: 64.6%

#2432Easy

The Employee That Worked on the Longest Task

Array

Acceptance: 51.5%

#2433Medium

Find The Original Array of Prefix Xor

ArrayBit Manipulation

Acceptance: 88.0%

#2434Medium

Using a Robot to Print the Lexicographically Smallest String

GreedyHash TableStack+1

Acceptance: 62.5%

#2435Hard

Paths in Matrix Whose Sum Is Divisible by K

ArrayDynamic ProgrammingMatrix

Acceptance: 58.7%

#2436Medium

Minimum Split Into Subarrays With GCD Greater Than One

ArrayDynamic ProgrammingGreedy+2

Acceptance: 70.2%

#2437Easy

Number of Valid Clock Times

EnumerationString

Acceptance: 47.9%

#2438Medium

Range Product Queries of Powers

ArrayBit ManipulationPrefix Sum

Acceptance: 61.4%

#2439Medium

Minimize Maximum of Array

ArrayBinary SearchDynamic Programming+2

Acceptance: 46.4%

#2440Hard

Create Components With Same Value

ArrayDepth-First SearchEnumeration+2

Acceptance: 54.0%

#2441Easy

Largest Positive Integer That Exists With Its Negative

ArrayHash TableSorting+1

Acceptance: 74.9%

#2442Medium

Count Number of Distinct Integers After Reverse Operations

ArrayCountingHash Table+1

Acceptance: 81.4%

#2443Medium

Sum of Number and Its Reverse

EnumerationMath

Acceptance: 50.0%

#2444Hard

Count Subarrays With Fixed Bounds

ArrayMonotonic QueueQueue+1

Acceptance: 69.2%

#2445Medium

Number of Nodes With Value One

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 66.3%

#2446Easy

Determine if Two Events Have Conflict

ArrayString

Acceptance: 53.1%

#2447Medium

Number of Subarrays With GCD Equal to K

ArrayMathNumber Theory

Acceptance: 53.3%

#2448Hard

Minimum Cost to Make Array Equal

ArrayBinary SearchGreedy+2

Acceptance: 46.7%

#2449Hard

Minimum Number of Operations to Make Arrays Similar

ArrayGreedySorting

Acceptance: 61.8%

#2450Medium

Number of Distinct Binary Strings After Applying Operations

MathString

Acceptance: 63.0%

1 2 348 49 5079 80 81

Page 49 of 81

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