Solutions & Explanations
Browse 4,029+ detailed solutions with multiple approaches, code in Python, Java, C++ and more.
Check if One String Swap Can Make Strings Equal
Acceptance: 49.5%
Find Center of Star Graph
Acceptance: 86.6%
Rearrange Products Table
Acceptance: 85.4%
Second Largest Digit in a String
Acceptance: 55.2%
Maximum Ascending Subarray Sum
Acceptance: 66.3%
Number of Different Integers in a String
Acceptance: 40.2%
Ad-Free Sessions
Acceptance: 58.6%
Determine Color of a Chessboard Square
Acceptance: 79.8%
Truncate Sentence
Acceptance: 86.7%
Find Customers With Positive Revenue this Year
Acceptance: 87.7%
Sign of the Product of an Array
Acceptance: 64.8%
Faulty Sensor
Acceptance: 50.2%
Minimum Operations to Make the Array Increasing
Acceptance: 82.5%
Check if the Sentence Is Pangram
Acceptance: 84.2%
Sum of Digits in Base K
Acceptance: 79.2%
Replace All Digits with Characters
Acceptance: 82.7%
Minimum Distance to the Target Element
Acceptance: 64.5%
Convert Date Format
Acceptance: 85.6%
Maximum Population Year
Acceptance: 64.4%
Sorting the Sentence
Acceptance: 84.1%
Sum of All Subset XOR Totals
Acceptance: 90.1%
Longer Contiguous Segments of Ones than Zeros
Acceptance: 62.4%
Calculate Special Bonus
Acceptance: 57.5%
Substrings of Size Three with Distinct Characters
Acceptance: 76.7%
Check if Word Equals Summation of Two Words
Acceptance: 75.2%
Determine Whether Matrix Can Be Obtained By Rotation
Acceptance: 68.2%
The Latest Login in 2020
Acceptance: 77.4%
Check if All the Integers in a Range Are Covered
Acceptance: 51.4%
Redistribute Characters to Make All Strings Equal
Acceptance: 67.0%
Largest Odd Number in String
Acceptance: 67.7%
Remove One Element to Make the Array Strictly Increasing
Acceptance: 30.8%
Maximum Product Difference Between Two Pairs
Acceptance: 82.9%
Build Array from Permutation
Acceptance: 91.1%
Count Square Sum Triples
Acceptance: 77.2%
Concatenation of Array
Acceptance: 90.2%
Check if String Is Decomposable Into Value-Equal Substrings
Acceptance: 50.4%
Maximum Number of Words You Can Type
Acceptance: 82.9%
Users That Actively Request Confirmation Messages
Acceptance: 56.4%
Check if All Characters Have Equal Number of Occurrences
Acceptance: 79.4%
Sum of Digits of String After Convert
Acceptance: 74.9%
Three Divisors
Acceptance: 64.6%
Delete Characters to Make Fancy String
Acceptance: 74.1%
Check If String Is a Prefix of Array
Acceptance: 52.7%
Employees With Missing Information
Acceptance: 72.6%
Number of Strings That Appear as Substrings in Word
Acceptance: 86.1%
Find if Path Exists in Graph
Acceptance: 55.5%
Minimum Time to Type Word Using Special Typewriter
Acceptance: 78.5%
Employees Whose Manager Left the Company
Acceptance: 48.9%
Find Greatest Common Divisor of Array
Acceptance: 83.4%
Minimum Difference Between Highest and Lowest of K Scores
Acceptance: 66.2%
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