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Amazon interview questions (last 90 days) · FAANGrind

Amazon

FAANGGlobal Last 90 days

Amazon combines a global online store with AWS cloud services, logistics, advertising, devices, and streaming businesses.

Est. 1994 100,001+ employees

Problems: 679
Window: 90d
Topics: 6

679 problems

TopicsLinks

1

1.Minimum Cost to Convert String III

Hard1 co.

Hard

also at 0 more

2

2.Left Rotate Array by K Places

Easy25 co.

Easy

also at 24 more

3

3.Number of Provinces

Medium4 co.

Medium

also at 3 more

4

4.Random Pick with Weight

Medium8 co.

Medium

also at 7 more

5

5.Count Pairs of Equal Substrings with Minimum Difference

Medium9 co.

Medium

Greedy Algorithms

also at 8 more

6

6.Longest Substring With At Most K Distinct Characters

Medium15 co.

Medium

Strings Hashing

also at 14 more

7

7.Minimum Time Takes to Reach Destination Without Drowning

Medium6 co.

Medium

also at 5 more

8

8.Insert Delete GetRandom O(1)

Medium20 co.

Medium

also at 19 more

9

9.Delete and Earn

Medium8 co.

Medium

Dynamic Programming

also at 7 more

10

10.Longest Arithmetic Sequence After Changing At Most One Element

Medium1 co.

Medium

Recursion & Backtracking

also at 0 more

11

11.Brace Expansion

Medium9 co.

Medium

Recursion & Backtracking

also at 8 more

12

12.Partition Equal Subset Sum

Medium10 co.

Medium

Dynamic Programming

also at 9 more

13

13.Reverse Integer

Medium15 co.

Medium

also at 14 more

14

14.Contains Duplicate II

Easy11 co.

Easy

also at 10 more

15

15.Minimizing Array After Replacing Pairs With Their Product

Medium2 co.

Medium

Dynamic Programming

also at 1 more

16

16.Sort an array of 0's 1's and 2's

Medium32 co.

Medium

also at 31 more

17

17.Remove K Digits

Medium22 co.

Medium

also at 21 more

18

18.Find the Number of Subsequences With Equal GCD

Hard5 co.

Hard

Dynamic Programming

also at 4 more

19

19.Verifying an Alien Dictionary

Easy4 co.

Easy

also at 3 more

20

20.Happy Number

Easy17 co.

Easy

also at 16 more

21

21.Minimum Height Trees

Medium2 co.

Medium

also at 1 more

22

22.Pancake Sorting

Medium1 co.

Medium

Greedy Algorithms

also at 0 more

23

23.Remove Outermost Parentheses

Medium8 co.

Medium

Strings Stack & Queues

also at 7 more

24

24.Contiguous Array

Medium11 co.

Medium

also at 10 more

25

25.Edit distance

Medium24 co.

Medium

Dynamic Programming

also at 23 more

26

Medium25 co.

Medium

also at 24 more

27

27.Best time to buy and sell stock IV

Hard16 co.

Hard

Dynamic Programming

also at 15 more

28

28.Running Sum of 1d Array

Easy5 co.

Easy

also at 4 more

29

Medium20 co.

Medium

Dynamic Programming

also at 19 more

30

30.Row With Maximum Ones

Easy1 co.

Easy

also at 0 more

31

Medium2 co.

Medium

also at 1 more

32

32.Change Case of Each Character in a String

Easy3 co.

Easy

also at 2 more

33

33.Implement Queue using Arrays

Medium6 co.

Medium

also at 5 more

34

34.Minimum Adjacent Swaps for K Consecutive Ones

Hard1 co.

Hard

Greedy Algorithms

also at 0 more

35

35.Find the starting point in LL

Medium12 co.

Medium

also at 11 more

36

36.Minimum Number of Operations to Make Array Continuous

Hard2 co.

Hard

also at 1 more

37

37.Maximum Coins From K Consecutive Bags

Medium1 co.

Medium

also at 0 more

38

38.Celebrity Problem

Medium13 co.

Medium

Arrays Stack & Queues

also at 12 more

39

39.BST iterator

Medium3 co.

Medium

Binary Search Trees

also at 2 more

40

40.Maximum XOR Length

Medium1 co.

Medium

also at 0 more

41

41.Print all nodes at a distance of K in BT

Medium18 co.

Medium

also at 17 more

42

42.Design In-Memory File System

Hard10 co.

Hard

also at 9 more

43

43.Guess Number Higher or Lower

Easy2 co.

Easy

also at 1 more

44

44.Min Cost Climbing Stairs

Easy1 co.

Easy

Dynamic Programming

also at 0 more

45

45.Count Substrings Without Repeating Characters

Medium6 co.

Medium

also at 5 more

46

46.Valid Parenthesis String

Medium5 co.

Medium

Dynamic Programming

also at 4 more

47

47.Painting the Walls

Hard3 co.

Hard

Dynamic Programming

also at 2 more

48

48.Union of two sorted arrays

Medium6 co.

Medium

also at 5 more

49

49.Constructing Two Increasing Arrays

Hard4 co.

Hard

Dynamic Programming

also at 3 more

50

50.Sum of Subarray Minimums

Medium17 co.

Medium

also at 16 more

…

Showing 1–50 of 679

Difficulty split

Easy119(18%)
Medium459(68%)
Hard101(15%)

Top topics

Dynamic Programming97
Arrays70
Graphs64
Strings49
Greedy Algorithms45
Binary Search44