Coding interview questions

Amazon Coding Interview Questions (DSA)

The 50 DSA problems Amazon 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
49topics

By difficulty: Easy (13) · Medium (30) · Hard (7)

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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
121.Best Time to Buy and Sell Stock
Full breakdownArrayDynamic Programming
Easy+10▶ Mock
146.LRU Cache
Full breakdownHash TableLinked ListDesign
Medium+9▶ Mock
200.Number of Islands
Full breakdownArrayDepth-First SearchBreadth-First Search
Medium+7▶ Mock
875.Koko Eating Bananas
Full breakdownArrayBinary Search
Medium▶ Mock
11.Container With Most Water
Full breakdownArrayTwo PointersGreedy
Medium+6▶ Mock
42.Trapping Rain Water
Full breakdownArrayTwo PointersDynamic Programming
Hard+6▶ Mock
56.Merge Intervals
Full breakdownArraySortingQuicksort
Medium+14▶ Mock
2.Add Two Numbers
Full breakdownLinked ListMathRecursion
Medium+3▶ Mock
207.Course Schedule
Full breakdownDepth-First SearchBreadth-First SearchGraph Theory
Medium+4▶ Mock
138.Copy List with Random Pointer
Full breakdownHash TableLinked List
Medium+1▶ Mock
169.Majority Element
Full breakdownArrayHash TableDivide and Conquer
15.3Sum
Full breakdownArrayTwo PointersSorting
Medium+5▶ Mock
4.Median of Two Sorted Arrays
Full breakdownArrayBinary SearchDivide and Conquer
Hard+5▶ Mock
9.Palindrome Number
Full breakdownMath
75.Sort Colors
Full breakdownArrayTwo PointersSorting
Medium▶ Mock
76.Minimum Window Substring
Full breakdownHash TableStringSliding Window
5.Longest Palindromic Substring
Full breakdownTwo PointersStringDynamic Programming
Medium+8▶ Mock
3413.Maximum Coins From K Consecutive Bags
Full breakdownArrayBinary SearchGreedy
Medium▶ Mock
904.Fruit Into Baskets
Full breakdownArrayHash TableSliding Window
Medium▶ Mock
26.Remove Duplicates from Sorted Array
Full breakdownArrayTwo Pointers
Easy+1▶ Mock
49.Group Anagrams
Full breakdownArrayHash TableString
Medium+9▶ Mock
21.Merge Two Sorted Lists
Full breakdownLinked ListRecursion
Easy+2▶ Mock
127.Word Ladder
Full breakdownHash TableStringBreadth-First Search
53.Maximum Subarray
Full breakdownArrayDivide and ConquerDynamic Programming
Medium+7▶ Mock
78.Subsets
Full breakdownArrayBacktrackingBit Manipulation
Medium▶ Mock
347.Top K Frequent Elements
Full breakdownArrayHash TableDivide and Conquer
Medium+6▶ Mock
410.Split Array Largest Sum
Full breakdownArrayBinary SearchDynamic Programming
7.Reverse Integer
Full breakdownMath
Medium▶ Mock
239.Sliding Window Maximum
Full breakdownArrayQueueSliding Window
Hard+2▶ Mock
1011.Capacity To Ship Packages Within D Days
Full breakdownArrayBinary Search
Medium▶ Mock
70.Climbing Stairs
Full breakdownMathDynamic ProgrammingMemoization
Easy+4▶ Mock
994.Rotting Oranges
Full breakdownArrayBreadth-First SearchMatrix
Medium+5▶ Mock
88.Merge Sorted Array
Full breakdownArrayTwo PointersSorting
Easy+1▶ Mock
253.Meeting Rooms II
Full breakdownArrayTwo PointersGreedy
Medium+6▶ Mock
337.House Robber III
Full breakdownDynamic ProgrammingTreeDepth-First Search
Medium▶ Mock
167.Two Sum II - Input Array Is Sorted
Full breakdownArrayTwo PointersBinary Search
Medium▶ Mock
767.Reorganize String
Full breakdownHash TableStringGreedy
Medium▶ Mock
28.Find the Index of the First Occurrence in a String
Full breakdownTwo PointersStringString Matching
20.Valid Parentheses
Full breakdownStringStackBracket Sequences
Easy+3▶ Mock
643.Maximum Average Subarray I
Full breakdownArraySliding Window
1929.Concatenation of Array
Full breakdownArraySimulation
153.Find Minimum in Rotated Sorted Array
Full breakdownArrayBinary Search
Medium▶ Mock
124.Binary Tree Maximum Path Sum
Full breakdownDynamic ProgrammingTreeDepth-First Search
735.Asteroid Collision
Full breakdownArrayStackSimulation
Medium+1▶ Mock
128.Longest Consecutive Sequence
Full breakdownArrayHash TableUnion-Find
Medium+3▶ Mock
27.Remove Element
Full breakdownArrayTwo Pointers
621.Task Scheduler
Full breakdownArrayHash TableGreedy
Medium+2▶ Mock

Frequently Asked Questions

What questions does Amazon ask in coding interviews?

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

How many Amazon coding interview questions are there?

InterviewSkool has 50 Amazon coding interview questions: 13 Easy, 30 Medium, and 7 Hard. Most Amazon interviews focus on Medium-difficulty problems, so prioritize those in your prep.

How should I prepare for Amazon 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 Amazon coding interview questions free?

Yes. All 50 Amazon 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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