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Solutions & Explanations

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

4,029 Solutions961 Easy2102 Medium966 Hard
All4029Easy961Medium2102Hard966
#3803Easy

Count Residue Prefixes

Hash TableString

Acceptance: 66.0%

#3798Easy

Largest Even Number

String

Acceptance: 68.5%

#3813Easy

Vowel-Consonant Score

SimulationString

Acceptance: 53.3%

#3794Easy

Reverse String Prefix

StringTwo Pointers

Acceptance: 88.5%

#3783Easy

Mirror Distance of an Integer

Math

Acceptance: 91.5%

#3774Easy

Absolute Difference Between Maximum and Minimum K Elements

ArraySorting

Acceptance: 74.8%

#3769Easy

Sort Integers by Binary Reflection

ArraySorting

Acceptance: 60.2%

#3754Easy

Concatenate Non-Zero Digits and Multiply by Sum I

Math

Acceptance: 66.2%

#3750Easy

Minimum Number of Flips to Reverse Binary String

Bit ManipulationMathString+1

Acceptance: 76.7%

#3736Easy

Minimum Moves to Equal Array Elements III

ArrayMath

Acceptance: 81.0%

#3740Easy

Minimum Distance Between Three Equal Elements I

ArrayHash Table

Acceptance: 73.4%

#3745Easy

Maximize Expression of Three Elements

ArrayEnumerationGreedy+1

Acceptance: 72.3%

#3731Easy

Find Missing Elements

ArrayHash TableSorting

Acceptance: 88.6%

#3718Easy

Smallest Missing Multiple of K

ArrayHash Table

Acceptance: 71.5%

#3712Easy

Sum of Elements With Frequency Divisible by K

ArrayCountingHash Table

Acceptance: 77.7%

#3696Easy

Maximum Distance Between Unequal Words in Array I

ArrayString

Acceptance: 81.7%

#3687Easy

Library Late Fee Calculator

ArraySimulation

Acceptance: 94.4%

#3701Easy

Compute Alternating Sum

ArraySimulation

Acceptance: 89.8%

#3692Easy

Majority Frequency Characters

CountingHash TableString

Acceptance: 66.3%

#3707Easy

Equal Score Substrings

Prefix SumString

Acceptance: 56.7%

#3726Easy

Remove Zeros in Decimal Representation

MathSimulation

Acceptance: 75.7%

#3697Easy

Compute Decimal Representation

ArrayMath

Acceptance: 64.7%

#3667Easy

Sort Array By Absolute Value

ArrayMathSorting+1

Acceptance: 86.7%

#3662Easy

Filter Characters by Frequency

CountingHash TableString

Acceptance: 86.2%

#3683Easy

Earliest Time to Finish One Task

Array

Acceptance: 84.5%

#3678Easy

Smallest Absent Positive Greater Than Average

ArrayHash Table

Acceptance: 34.2%

#3688Easy

Bitwise OR of Even Numbers in an Array

ArrayBit ManipulationSimulation

Acceptance: 84.9%

#3668Easy

Restore Finishing Order

ArrayHash Table

Acceptance: 91.1%

#3674Easy

Minimum Operations to Equalize Array

ArrayBit ManipulationBrainteaser

Acceptance: 60.8%

#3684Easy

Maximize Sum of At Most K Distinct Elements

ArrayGreedyHash Table+1

Acceptance: 76.8%

#3658Easy

GCD of Odd and Even Sums

MathNumber Theory

Acceptance: 89.8%

#3663Easy

Find The Least Frequent Digit

ArrayCountingHash Table+1

Acceptance: 68.8%

#3643Easy

Flip Square Submatrix Vertically

ArrayMatrixTwo Pointers

Acceptance: 79.3%

#3633Easy

Earliest Finish Time for Land and Water Rides I

ArrayBinary SearchGreedy+2

Acceptance: 73.0%

#3637Easy

Trionic Array I

Array

Acceptance: 49.5%

#3606Easy

Coupon Code Validator

ArrayHash TableSorting+1

Acceptance: 64.4%

#3581Easy

Count Odd Letters from Number

CountingHash TableSimulation+1

Acceptance: 85.1%

#3622Easy

Check Divisibility by Digit Sum and Product

Math

Acceptance: 74.5%

#3591Easy

Check if Any Element Has Prime Frequency

ArrayCountingHash Table+2

Acceptance: 62.6%

#3602Easy

Hexadecimal and Hexatrigesimal Conversion

MathString

Acceptance: 79.4%

#3571Easy

Find the Shortest Superstring II

String

Acceptance: 48.8%

#3582Easy

Generate Tag for Video Caption

SimulationString

Acceptance: 32.4%

#3560Easy

Find Minimum Log Transportation Cost

Math

Acceptance: 42.2%

#3541Easy

Find Most Frequent Vowel and Consonant

CountingHash TableString

Acceptance: 89.4%

#3545Easy

Minimum Deletions for At Most K Distinct Characters

CountingGreedyHash Table+2

Acceptance: 72.2%

#3550Easy

Smallest Index With Digit Sum Equal to Index

ArrayMath

Acceptance: 79.5%

#3536Easy

Maximum Product of Two Digits

MathSorting

Acceptance: 75.7%

#3512Easy

Minimum Operations to Make Array Sum Divisible by K

ArrayMath

Acceptance: 92.4%

#3491Easy

Phone Number Prefix

ArraySortingString+1

Acceptance: 69.9%

#3502Easy

Minimum Cost to Reach Every Position

Array

Acceptance: 82.6%

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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