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 |
|---|---|---|---|---|
| 4013. Count Subarrays With Even Odd Ratio II | Hard | 40.3% | Read | |
| 4017. Peaks in Array II | Hard | 27.8% | Read | |
| 4018. Total Sum of Interaction Cost in Tree Groups II | Hard | 69.2% | Read | |
| 4023. Elevator Requests II | Hard | 27.0% | Read | |
| 4027. Elevator Requests III | Hard | 45.7% | Read | |
| 4029. Minimum Operations to Make a Rotated Palindrome II | Hard | 62.9% | Read | |
| 4028. Minimum Operations to Make a Rotated Palindrome II | Hard | 68.4% | Read | |
| 4033. Valid K-Unique Subarrays I | Hard | 34.8% | Read | |
| 4037. Maximum Valid Split Positions II | Hard | 31.6% | Read | |
| 4041. Minimum Operations to Form Subset Sum II | Hard | 49.3% | Read | |
| 4042. Valid K-Unique Subarrays II | Hard | 68.8% | Read | |
| 4046. Minimum Cost Path With At Most K Turns | Hard | 53.9% | Read | |
| 4047. Minimum Operations to Make XOR of All Elements Zero | Hard | 57.7% | Read | |
| 4051. Count Subarrays with Distant Sums | Hard | 32.2% | Read | |
| 4055. Count Shadow Pairs II | Hard | 17.5% | Read | |
| 4059. Lexicographically Largest Power Array | Hard | 22.4% | Read |
#4013Hard
Count Subarrays With Even Odd Ratio II
ArrayBinary Indexed TreeDivide and Conquer+3
Acceptance: 40.3%
#4017Hard
Peaks in Array II
ArrayDivide and ConquerSegment Tree
Acceptance: 27.8%
#4018Hard
Total Sum of Interaction Cost in Tree Groups II
Acceptance: 69.2%
#4023Hard
Elevator Requests II
ArrayDynamic ProgrammingSorting
Acceptance: 27.0%
#4027Hard
Elevator Requests III
ArrayBit ManipulationBitmask+2
Acceptance: 45.7%
#4029Hard
Minimum Operations to Make a Rotated Palindrome II
Acceptance: 62.9%
#4028Hard
Minimum Operations to Make a Rotated Palindrome II
Acceptance: 68.4%
#4033Hard
Valid K-Unique Subarrays I
ArrayBinary Indexed TreeBit Manipulation+3
Acceptance: 34.8%
#4037Hard
Maximum Valid Split Positions II
ArrayEnumerationMath+1
Acceptance: 31.6%
#4041Hard
Minimum Operations to Form Subset Sum II
ArrayDynamic Programming
Acceptance: 49.3%
#4042Hard
Valid K-Unique Subarrays II
Acceptance: 68.8%
#4046Hard
Minimum Cost Path With At Most K Turns
ArrayGraphHeap+2
Acceptance: 53.9%
#4047Hard
Minimum Operations to Make XOR of All Elements Zero
Acceptance: 57.7%
#4051Hard
Count Subarrays with Distant Sums
ArrayBinary Indexed TreeBinary Search+2
Acceptance: 32.2%
#4055Hard
Count Shadow Pairs II
ArrayBinary Indexed TreeBinary Search+5
Acceptance: 17.5%
#4059Hard
Lexicographically Largest Power Array
Acceptance: 22.4%
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