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
1451. Rearrange Words in a Sentence	Medium	66.9%	Sorting String	Read
1452. People Whose List of Favorite Companies Is Not a Subset of Another List	Medium	60.6%	Array Hash Table+1	Read
1453. Maximum Number of Darts Inside of a Circular Dartboard	Hard	41.2%	Array Geometry+1	Read
1454. Active Users	Medium	36.7%	Database	Read
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	68.8%	String String Matching+1	Read
1456. Maximum Number of Vowels in a Substring of Given Length	Medium	63.0%	Sliding Window String	Read
1457. Pseudo-Palindromic Paths in a Binary Tree	Medium	68.3%	Binary Tree Bit Manipulation+3	Read
1458. Max Dot Product of Two Subsequences	Hard	69.4%	Array Dynamic Programming	Read
1459. Rectangles Area	Medium	68.5%	Database	Read
1460. Make Two Arrays Equal by Reversing Subarrays	Easy	75.9%	Array Hash Table+1	Read
1461. Check If a String Contains All Binary Codes of Size K	Medium	61.5%	Bit Manipulation Hash Function+3	Read
1462. Course Schedule IV	Medium	60.4%	Breadth-First Search Depth-First Search+2	Read
1463. Cherry Pickup II	Hard	72.4%	Array Dynamic Programming+1	Read
1464. Maximum Product of Two Elements in an Array	Easy	84.7%	Array Heap (Priority Queue)+1	Read
1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium	41.1%	Array Greedy+1	Read
1466. Reorder Routes to Make All Paths Lead to the City Zero	Medium	65.7%	Breadth-First Search Depth-First Search+1	Read
1467. Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard	61.7%	Array Backtracking+4	Read
1468. Calculate Salaries	Medium	78.4%	Database	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
1471. The k Strongest Values in an Array	Medium	62.6%	Array Sorting+1	Read
1472. Design Browser History	Medium	78.3%	Array Data Stream+4	Read
1473. Paint House III	Hard	60.9%	Array Dynamic Programming	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
1476. Subrectangle Queries	Medium	86.3%	Array Design+1	Read
1477. Find Two Non-overlapping Sub-arrays Each With Target Sum	Medium	49.5%	Array Binary Search+3	Read
1478. Allocate Mailboxes	Hard	56.5%	Array Dynamic Programming+2	Read
1479. Sales by Day of the Week	Hard	77.4%	Database	Read
1480. Running Sum of 1d Array	Easy	86.9%	Array Prefix Sum	Read
1481. Least Number of Unique Integers after K Removals	Medium	63.8%	Array Counting+3	Read
1482. Minimum Number of Days to Make m Bouquets	Medium	56.9%	Array Binary Search	Read
1483. Kth Ancestor of a Tree Node	Hard	39.7%	Binary Search Breadth-First Search+4	Read
1484. Group Sold Products By The Date	Easy	77.5%	Database	Read
1485. Clone Binary Tree With Random Pointer	Medium	81.2%	Binary Tree Breadth-First Search+3	Read
1486. XOR Operation in an Array	Easy	87.5%	Bit Manipulation Math	Read
1487. Making File Names Unique	Medium	38.5%	Array Hash Table+1	Read
1488. Avoid Flood in The City	Medium	39.0%	Array Binary Search+3	Read
1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard	66.4%	Graph Minimum Spanning Tree+3	Read
1490. Clone N-ary Tree	Medium	83.2%	Breadth-First Search Depth-First Search+2	Read
1491. Average Salary Excluding the Minimum and Maximum Salary	Easy	63.5%	Array Sorting	Read
1492. The kth Factor of n	Medium	70.8%	Math Number Theory	Read
1493. Longest Subarray of 1's After Deleting One Element	Medium	71.1%	Array Dynamic Programming+1	Read
1494. Parallel Courses II	Hard	31.3%	Bit Manipulation Bitmask+2	Read
1495. Friendly Movies Streamed Last Month	Easy	49.0%	Database	Read
1496. Path Crossing	Easy	62.5%	Hash Table String	Read
1497. Check If Array Pairs Are Divisible by k	Medium	46.2%	Array Counting+1	Read
1498. Number of Subsequences That Satisfy the Given Sum Condition	Medium	49.2%	Array Binary Search+2	Read
1499. Max Value of Equation	Hard	45.0%	Array Heap (Priority Queue)+3	Read
1500. Design a File Sharing System	Medium	41.7%	Data Stream Design+3	Read

#1451Medium

Rearrange Words in a Sentence

SortingString

Acceptance: 66.9%

#1452Medium

People Whose List of Favorite Companies Is Not a Subset of Another List

ArrayHash TableString

Acceptance: 60.6%

#1453Hard

Maximum Number of Darts Inside of a Circular Dartboard

ArrayGeometryMath

Acceptance: 41.2%

#1454Medium

Active Users

Database

Acceptance: 36.7%

#1455Easy

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

StringString MatchingTwo Pointers

Acceptance: 68.8%

#1456Medium

Maximum Number of Vowels in a Substring of Given Length

Sliding WindowString

Acceptance: 63.0%

#1457Medium

Pseudo-Palindromic Paths in a Binary Tree

Binary TreeBit ManipulationBreadth-First Search+2

Acceptance: 68.3%

#1458Hard

Max Dot Product of Two Subsequences

ArrayDynamic Programming

Acceptance: 69.4%

#1459Medium

Rectangles Area

Database

Acceptance: 68.5%

#1460Easy

Make Two Arrays Equal by Reversing Subarrays

ArrayHash TableSorting

Acceptance: 75.9%

#1461Medium

Check If a String Contains All Binary Codes of Size K

Bit ManipulationHash FunctionHash Table+2

Acceptance: 61.5%

#1462Medium

Course Schedule IV

Breadth-First SearchDepth-First SearchGraph+1

Acceptance: 60.4%

#1463Hard

Cherry Pickup II

ArrayDynamic ProgrammingMatrix

Acceptance: 72.4%

#1464Easy

Maximum Product of Two Elements in an Array

ArrayHeap (Priority Queue)Sorting

Acceptance: 84.7%

#1465Medium

Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts

ArrayGreedySorting

Acceptance: 41.1%

#1466Medium

Reorder Routes to Make All Paths Lead to the City Zero

Breadth-First SearchDepth-First SearchGraph

Acceptance: 65.7%

#1467Hard

Probability of a Two Boxes Having The Same Number of Distinct Balls

ArrayBacktrackingCombinatorics+3

Acceptance: 61.7%

#1468Medium

Calculate Salaries

Database

Acceptance: 78.4%

#1469Easy

Find All The Lonely Nodes

Binary TreeBreadth-First SearchDepth-First Search+1

Acceptance: 83.8%

#1470Easy

Shuffle the Array

Array

Acceptance: 88.7%

#1471Medium

The k Strongest Values in an Array

ArraySortingTwo Pointers

Acceptance: 62.6%

#1472Medium

Design Browser History

ArrayData StreamDesign+3

Acceptance: 78.3%

#1473Hard

Paint House III

ArrayDynamic Programming

Acceptance: 60.9%

#1474Easy

Delete N Nodes After M Nodes of a Linked List

Linked List

Acceptance: 74.4%

#1475Easy

Final Prices With a Special Discount in a Shop

ArrayMonotonic StackStack

Acceptance: 84.1%

#1476Medium

Subrectangle Queries

ArrayDesignMatrix

Acceptance: 86.3%

#1477Medium

Find Two Non-overlapping Sub-arrays Each With Target Sum

ArrayBinary SearchDynamic Programming+2

Acceptance: 49.5%

#1478Hard

Allocate Mailboxes

ArrayDynamic ProgrammingMath+1

Acceptance: 56.5%

#1479Hard

Sales by Day of the Week

Database

Acceptance: 77.4%

#1480Easy

Running Sum of 1d Array

ArrayPrefix Sum

Acceptance: 86.9%

#1481Medium

Least Number of Unique Integers after K Removals

ArrayCountingGreedy+2

Acceptance: 63.8%

#1482Medium

Minimum Number of Days to Make m Bouquets

ArrayBinary Search

Acceptance: 56.9%

#1483Hard

Kth Ancestor of a Tree Node

Binary SearchBreadth-First SearchDepth-First Search+3

Acceptance: 39.7%

#1484Easy

Group Sold Products By The Date

Database

Acceptance: 77.5%

#1485Medium

Clone Binary Tree With Random Pointer

Binary TreeBreadth-First SearchDepth-First Search+2

Acceptance: 81.2%

#1486Easy

XOR Operation in an Array

Bit ManipulationMath

Acceptance: 87.5%

#1487Medium

Making File Names Unique

ArrayHash TableString

Acceptance: 38.5%

#1488Medium

Avoid Flood in The City

ArrayBinary SearchGreedy+2

Acceptance: 39.0%

#1489Hard

Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree

GraphMinimum Spanning TreeSorting+2

Acceptance: 66.4%

#1490Medium

Clone N-ary Tree

Breadth-First SearchDepth-First SearchHash Table+1

Acceptance: 83.2%

#1491Easy

Average Salary Excluding the Minimum and Maximum Salary

ArraySorting

Acceptance: 63.5%

#1492Medium

The kth Factor of n

MathNumber Theory

Acceptance: 70.8%

#1493Medium

Longest Subarray of 1's After Deleting One Element

ArrayDynamic ProgrammingSliding Window

Acceptance: 71.1%

#1494Hard

Parallel Courses II

Bit ManipulationBitmaskDynamic Programming+1

Acceptance: 31.3%

#1495Easy

Friendly Movies Streamed Last Month

Database

Acceptance: 49.0%

#1496Easy

Path Crossing

Hash TableString

Acceptance: 62.5%

#1497Medium

Check If Array Pairs Are Divisible by k

ArrayCountingHash Table

Acceptance: 46.2%

#1498Medium

Number of Subsequences That Satisfy the Given Sum Condition

ArrayBinary SearchSorting+1

Acceptance: 49.2%

#1499Hard

Max Value of Equation

ArrayHeap (Priority Queue)Monotonic Queue+2

Acceptance: 45.0%

#1500Medium

Design a File Sharing System

Data StreamDesignHash Table+2

Acceptance: 41.7%

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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
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