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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
#1790Easy

Check if One String Swap Can Make Strings Equal

CountingHash TableString

Acceptance: 49.5%

#1791Easy

Find Center of Star Graph

Graph

Acceptance: 86.6%

#1795Easy

Rearrange Products Table

Database

Acceptance: 85.4%

#1796Easy

Second Largest Digit in a String

Hash TableString

Acceptance: 55.2%

#1800Easy

Maximum Ascending Subarray Sum

Array

Acceptance: 66.3%

#1805Easy

Number of Different Integers in a String

Hash TableString

Acceptance: 40.2%

#1809Easy

Ad-Free Sessions

Database

Acceptance: 58.6%

#1812Easy

Determine Color of a Chessboard Square

MathString

Acceptance: 79.8%

#1816Easy

Truncate Sentence

ArrayString

Acceptance: 86.7%

#1821Easy

Find Customers With Positive Revenue this Year

Database

Acceptance: 87.7%

#1822Easy

Sign of the Product of an Array

ArrayMath

Acceptance: 64.8%

#1826Easy

Faulty Sensor

ArrayTwo Pointers

Acceptance: 50.2%

#1827Easy

Minimum Operations to Make the Array Increasing

ArrayGreedy

Acceptance: 82.5%

#1832Easy

Check if the Sentence Is Pangram

Hash TableString

Acceptance: 84.2%

#1837Easy

Sum of Digits in Base K

Math

Acceptance: 79.2%

#1844Easy

Replace All Digits with Characters

String

Acceptance: 82.7%

#1848Easy

Minimum Distance to the Target Element

Array

Acceptance: 64.5%

#1853Easy

Convert Date Format

Database

Acceptance: 85.6%

#1854Easy

Maximum Population Year

ArrayCountingPrefix Sum

Acceptance: 64.4%

#1859Easy

Sorting the Sentence

SortingString

Acceptance: 84.1%

#1863Easy

Sum of All Subset XOR Totals

ArrayBacktrackingBit Manipulation+3

Acceptance: 90.1%

#1869Easy

Longer Contiguous Segments of Ones than Zeros

String

Acceptance: 62.4%

#1873Easy

Calculate Special Bonus

Database

Acceptance: 57.5%

#1876Easy

Substrings of Size Three with Distinct Characters

CountingHash TableSliding Window+1

Acceptance: 76.7%

#1880Easy

Check if Word Equals Summation of Two Words

String

Acceptance: 75.2%

#1886Easy

Determine Whether Matrix Can Be Obtained By Rotation

ArrayMatrix

Acceptance: 68.2%

#1890Easy

The Latest Login in 2020

Database

Acceptance: 77.4%

#1893Easy

Check if All the Integers in a Range Are Covered

ArrayHash TablePrefix Sum

Acceptance: 51.4%

#1897Easy

Redistribute Characters to Make All Strings Equal

CountingHash TableString

Acceptance: 67.0%

#1903Easy

Largest Odd Number in String

GreedyMathString

Acceptance: 67.7%

#1909Easy

Remove One Element to Make the Array Strictly Increasing

Array

Acceptance: 30.8%

#1913Easy

Maximum Product Difference Between Two Pairs

ArraySorting

Acceptance: 82.9%

#1920Easy

Build Array from Permutation

ArraySimulation

Acceptance: 91.1%

#1925Easy

Count Square Sum Triples

EnumerationMath

Acceptance: 77.2%

#1929Easy

Concatenation of Array

ArraySimulation

Acceptance: 90.2%

#1933Easy

Check if String Is Decomposable Into Value-Equal Substrings

String

Acceptance: 50.4%

#1935Easy

Maximum Number of Words You Can Type

Hash TableString

Acceptance: 82.9%

#1939Easy

Users That Actively Request Confirmation Messages

Database

Acceptance: 56.4%

#1941Easy

Check if All Characters Have Equal Number of Occurrences

CountingHash TableString

Acceptance: 79.4%

#1945Easy

Sum of Digits of String After Convert

SimulationString

Acceptance: 74.9%

#1952Easy

Three Divisors

EnumerationMathNumber Theory

Acceptance: 64.6%

#1957Easy

Delete Characters to Make Fancy String

String

Acceptance: 74.1%

#1961Easy

Check If String Is a Prefix of Array

ArrayStringTwo Pointers

Acceptance: 52.7%

#1965Easy

Employees With Missing Information

Database

Acceptance: 72.6%

#1967Easy

Number of Strings That Appear as Substrings in Word

ArrayString

Acceptance: 86.1%

#1971Easy

Find if Path Exists in Graph

Breadth-First SearchDepth-First SearchGraph+1

Acceptance: 55.5%

#1974Easy

Minimum Time to Type Word Using Special Typewriter

GreedyString

Acceptance: 78.5%

#1978Easy

Employees Whose Manager Left the Company

Database

Acceptance: 48.9%

#1979Easy

Find Greatest Common Divisor of Array

ArrayMathNumber Theory

Acceptance: 83.4%

#1984Easy

Minimum Difference Between Highest and Lowest of K Scores

ArraySliding WindowSorting

Acceptance: 66.2%

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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