Coding interview questions

Meta Coding Interview Questions (DSA)

The 50 DSA problems Meta has asked most in the last six months, most-asked first. 50 of them have a full breakdown with diagrams and code. Tick them off as you go.

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50problems
50full breakdowns
38topics

By difficulty: Easy (20) · Medium (25) · Hard (5)

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Topics

1.Two Sum
Full breakdownArrayHash Table
Easy+10▶ Mock
3.Longest Substring Without Repeating Characters
Full breakdownHash TableStringSliding Window
Medium+13▶ Mock
215.Kth Largest Element in an Array
Full breakdownArrayDivide and ConquerSorting
Medium▶ Mock
26.Remove Duplicates from Sorted Array
Full breakdownArrayTwo Pointers
Easy+1▶ Mock
2.Add Two Numbers
Full breakdownLinked ListMathRecursion
Medium+3▶ Mock
5.Longest Palindromic Substring
Full breakdownTwo PointersStringDynamic Programming
Medium+8▶ Mock
560.Subarray Sum Equals K
Full breakdownArrayHash TablePrefix Sum
Medium+2▶ Mock
12.Integer to Roman
Full breakdownHash TableMathString
Medium▶ Mock
7.Reverse Integer
Full breakdownMath
Medium▶ Mock
238.Product of Array Except Self
Full breakdownArrayPrefix Sum
Medium+5▶ Mock
283.Move Zeroes
Full breakdownArrayTwo Pointers
567.Permutation in String
Full breakdownHash TableTwo PointersString
Medium▶ Mock
11.Container With Most Water
Full breakdownArrayTwo PointersGreedy
Medium+6▶ Mock
4.Median of Two Sorted Arrays
Full breakdownArrayBinary SearchDivide and Conquer
Hard+5▶ Mock
70.Climbing Stairs
Full breakdownMathDynamic ProgrammingMemoization
Easy+4▶ Mock
136.Single Number
Full breakdownArrayBit Manipulation
509.Fibonacci Number
Full breakdownMathDynamic ProgrammingRecursion
13.Roman to Integer
Full breakdownHash TableMathString
Easy+2▶ Mock
3090.Maximum Length Substring With Two Occurrences
Full breakdownHash TableStringSliding Window
209.Minimum Size Subarray Sum
Full breakdownArrayBinary SearchSliding Window
Medium▶ Mock
20.Valid Parentheses
Full breakdownStringStackBracket Sequences
Easy+3▶ Mock
53.Maximum Subarray
Full breakdownArrayDivide and ConquerDynamic Programming
Medium+7▶ Mock
1386.Cinema Seat Allocation
Full breakdownArrayHash TableGreedy
Medium▶ Mock
1768.Merge Strings Alternately
Full breakdownTwo PointersString
297.Serialize and Deserialize Binary Tree
Full breakdownStringTreeDepth-First Search
Hard+4▶ Mock
303.Range Sum Query - Immutable
Full breakdownArrayDesignPrefix Sum
15.3Sum
Full breakdownArrayTwo PointersSorting
Medium+5▶ Mock
189.Rotate Array
Full breakdownArrayMathTwo Pointers
Medium+1▶ Mock
207.Course Schedule
Full breakdownDepth-First SearchBreadth-First SearchGraph Theory
Medium+4▶ Mock
986.Interval List Intersections
Full breakdownArrayTwo PointersSweep Line
Medium▶ Mock
42.Trapping Rain Water
Full breakdownArrayTwo PointersDynamic Programming
Hard+6▶ Mock
Rising Temperature
Full breakdownDatabase
122.Best Time to Buy and Sell Stock II
Full breakdownArrayDynamic ProgrammingGreedy
Medium▶ Mock
32.Longest Valid Parentheses
Full breakdownStringDynamic ProgrammingStack
146.LRU Cache
Full breakdownHash TableLinked ListDesign
Medium+9▶ Mock
78.Subsets
Full breakdownArrayBacktrackingBit Manipulation
Medium+1▶ Mock
14.Longest Common Prefix
Full breakdownArrayStringTrie
Easy+1▶ Mock
704.Binary Search
Full breakdownArrayBinary Search
121.Best Time to Buy and Sell Stock
Full breakdownArrayDynamic Programming
Easy+10▶ Mock
31.Next Permutation
Full breakdownArrayTwo Pointers
Medium▶ Mock
977.Squares of a Sorted Array
Full breakdownArrayTwo PointersSorting
796.Rotate String
Full breakdownStringString Matching
23.Merge k Sorted Lists
Full breakdownLinked ListDivide and ConquerHeap (Priority Queue)
Hard+4▶ Mock
1004.Max Consecutive Ones III
Full breakdownArrayBinary SearchSliding Window
Medium▶ Mock
33.Search in Rotated Sorted Array
Full breakdownArrayBinary Search
Medium+5▶ Mock

Frequently Asked Questions

What questions does Meta ask in coding interviews?

Meta coding interviews focus on Array, Backtracking, Binary Search, Binary Tree, and other data structure problems. We compiled 50 questions from real Meta interviews. The most common topics are Array, Backtracking, Binary Search, Binary Tree, Bit Manipulation. Filter by topic to see what comes up most often.

How many Meta coding interview questions are there?

InterviewSkool has 50 Meta coding interview questions: 20 Easy, 25 Medium, and 5 Hard. Most Meta interviews focus on Medium-difficulty problems, so prioritize those in your prep.

How should I prepare for Meta coding interviews?

Start with Medium difficulty problems. Group by topic (Array, Tree, DP) to build pattern recognition. Aim to solve 30 to 40 problems before your interview. Then practice under pressure with a mock interview.

Are Meta coding interview questions free?

Yes. All 50 Meta coding interview questions are free to browse with no sign-up required. You can filter by difficulty and topic tags. Start a mock interview with a free credit to practice under real pressure.

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