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Sorting Interview Questions

66 Sorting problems asked across FAANG and top tech companies. Approach hints, optimal solutions, and related problems.

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Sorting 66
SortingClear all
56.Merge Intervals
ArraySorting
Medium+14▶ Mock
49.Group Anagrams
Hash TableStringSorting
Medium+9▶ Mock
15.3Sum
ArrayTwo PointersSorting
Medium+5▶ Mock
253.Meeting Rooms II
ArrayHeapSorting
Medium+6▶ Mock
75.Sort Colors
ArrayTwo PointersSorting
Medium▶ Mock
88.Merge Sorted Array
ArrayTwo PointersSorting
Easy+1▶ Mock
215.Kth Largest Element in an Array
ArrayDivide and ConquerSorting
Medium▶ Mock
977.Squares of a Sorted Array
ArrayTwo PointersSorting
Easy▶ Mock
169.Majority Element
ArrayHash TableDivide and Conquer
Easy▶ Mock
2503.Maximum Number of Points from Grid Queries
ArrayTwo PointersBreadth-First Search
Hard▶ Mock
2402.Meeting Rooms III
ArrayHash TableSorting
Hard▶ Mock
217.Contains Duplicate
ArrayHash TableSorting
Easy▶ Mock
16.3Sum Closest
ArrayTwo PointersSorting
Medium▶ Mock
18.4Sum
ArrayTwo PointersSorting
Medium▶ Mock
870.Advantage Shuffle
ArrayTwo PointersGreedy
Medium▶ Mock
314.Binary Tree Vertical Order Traversal
Hash TableTreeDepth-First Search
Medium▶ Mock
220.Contains Duplicate III
ArraySliding WindowSorting
Hard▶ Mock
588.Design In-Memory File System
Hash TableStringDesign
Hard▶ Mock
179.Largest Number
ArrayStringGreedy
Medium▶ Mock
1048.Longest String Chain
ArrayHash TableTwo Pointers
Medium▶ Mock
658.Find K Closest Elements
ArrayTwo PointersBinary Search
Medium▶ Mock
2933.High-Access Employees
ArrayHash TableString
Medium▶ Mock
1200.Minimum Absolute Difference
ArraySorting
Easy▶ Mock
628.Maximum Product of Three Numbers
ArrayMathSorting
Easy▶ Mock
2551.Put Marbles in Bags
ArrayGreedySorting
Hard▶ Mock
1366.Rank Teams by Votes
ArrayHash TableString
Medium▶ Mock
2561.Rearranging Fruits
ArrayHash TableGreedy
Hard▶ Mock
767.Reorganize String
Hash TableStringGreedy
Medium▶ Mock
857.Minimum Cost to Hire K Workers
ArrayGreedySorting
Hard▶ Mock
3035.Maximum Palindromes After Operations
ArrayHash TableString
Medium▶ Mock
3893.Maximum Team Size with Overlapping Intervals
ArraySortingUnion Find
Medium▶ Mock
3634.Minimum Removals to Balance Array
ArrayBinary SearchSliding Window
Medium▶ Mock
3413.Maximum Coins From K Consecutive Bags
ArrayBinary SearchGreedy
Medium▶ Mock
3367.Maximize Sum of Weights after Edge Removals
Dynamic ProgrammingTreeDepth-First Search
Hard▶ Mock
2251.Number of Flowers in Full Bloom
ArrayHash TableBinary Search
Hard▶ Mock
3649.Number of Perfect Pairs
ArrayMathTwo Pointers
Medium▶ Mock
912.Sort an Array
ArrayDivide and ConquerSorting
Medium▶ Mock
645.Set Mismatch
ArrayHash TableBit Manipulation
Easy▶ Mock
692.Top K Frequent Words
ArrayHash TableString
Medium▶ Mock
1101.The Earliest Moment When Everyone Become Friends
ArrayUnion FindSorting
Medium▶ Mock
2948.Make Lexicographically Smallest Array by Swapping Elements
ArrayUnion FindSorting
Medium▶ Mock
332.Reconstruct Itinerary
ArrayStringDepth-First Search
Hard▶ Mock
354.Russian Doll Envelopes
ArrayBinary SearchDynamic Programming
Hard▶ Mock
1258.Synonymous Sentences
ArrayHash TableString
Medium▶ Mock
987.Vertical Order Traversal of a Binary Tree
Hash TableTreeDepth-First Search
Hard▶ Mock
Valid Anagram
Hash TableStringSorting
Easy▶ Mock
Missing Number
ArrayHash TableMath
Easy▶ Mock
475.Heaters
ArrayTwo PointersBinary Search
Medium▶ Mock
642.Design Search Autocomplete System
StringDepth-First SearchDesign
Hard▶ Mock
853.Car Fleet
ArrayStackSorting
Medium▶ Mock
973.K Closest Points to Origin
ArrayMathDivide and Conquer
Medium▶ Mock
1029.Two City Scheduling
ArrayGreedySorting
Medium▶ Mock
1086.High Five
ArrayHash TableSorting
Easy▶ Mock
1202.Smallest String With Swaps
ArrayHash TableString
Medium▶ Mock
1235.Maximum Profit in Job Scheduling
ArrayBinary SearchDynamic Programming
Hard▶ Mock
1244.Design A Leaderboard
Hash TableDesignSorting
Medium▶ Mock
1353.Maximum Number of Events That Can Be Attended
ArrayGreedySorting
Medium▶ Mock
1564.Put Boxes Into the Warehouse I
ArrayGreedySorting
Medium▶ Mock
1610.Maximum Number of Visible Points
ArrayMathGeometry
Hard▶ Mock
1648.Sell Diminishing-Valued Colored Balls
ArrayMathBinary Search
Medium▶ Mock
1710.Maximum Units on a Truck
ArrayGreedySorting
Easy▶ Mock
1751.Maximum Number of Events That Can Be Attended II
ArrayBinary SearchDynamic Programming
Hard▶ Mock
1834.Single-Threaded CPU
ArraySortingHeap
Medium▶ Mock
2171.Removing Minimum Number of Magic Beans
ArrayGreedySorting
Medium▶ Mock
2491.Divide Players Into Teams of Equal Skill
ArrayHash TableTwo Pointers
Medium▶ Mock
2895.Minimum Processing Time
ArrayGreedySorting
Medium▶ Mock

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