Dashboard Problems Companies Topics SQL System Design AI

No account needed. Your solved list, notes and streak are saved in this browser. Export them from Settings.

Companies

Dashboard Problems Companies System Design

Search

Jump to any problem, company or topic

American Express interview questions (last 30 days) · FAANGrind

American Express

FinanceGlobal Last 30 days

American Express combines card issuing, payment-network services, merchant solutions, travel, and expense management for consumers and businesses.

Est. 1850 50,001-100,000 employees

Problems: 165
Window: 30d
Topics: 6

165 problems

TopicsLinks

1

1.Print N to 1 using Recursion

Easy1 co.

Easy

Recursion & Backtracking

also at 0 more

2

2.Stock span problem

Medium10 co.

Medium

also at 9 more

3

3.Bold Words in String

Medium6 co.

Medium

also at 5 more

4

4.Subsequences with a Unique Middle Mode II

Hard1 co.

Hard

also at 0 more

5

5.Best time to buy and sell stock

Medium45 co.

Medium

Dynamic Programming

also at 44 more

6

6.Next Closest Time

Medium5 co.

Medium

Recursion & Backtracking

also at 4 more

7

7.Find K-Length Substrings With No Repeated Characters

Medium5 co.

Medium

also at 4 more

8

8.Largest rectangle in a histogram

Hard30 co.

Hard

also at 29 more

9

9.Bitwise OR of Adjacent Elements

Easy10 co.

Easy

Arrays Bit Manipulation

also at 9 more

10

10.Best time to buy and sell stock III

Medium13 co.

Medium

Dynamic Programming

also at 12 more

11

11.Longest Word with All Prefixes

Medium5 co.

Medium

also at 4 more

12

12.Move Zeros to End

Easy31 co.

Easy

also at 30 more

13

13.Permutations of a String

Medium2 co.

Medium

Recursion & Backtracking

also at 1 more

14

14.Best Time to Buy and Sell Stock with Cooldown

Medium12 co.

Medium

Dynamic Programming

also at 11 more

15

15.Maximum Consecutive Ones

Easy14 co.

Easy

also at 13 more

16

16.Maximum Number of Books You Can Take

Hard1 co.

Hard

Dynamic Programming

also at 0 more

17

17.Minimum Moves to Spread Stones Over Grid

Medium2 co.

Medium

Recursion & Backtracking

also at 1 more

18

18.Find All Symmetric Pairs

Easy4 co.

Easy

also at 3 more

19

19.Find the Duplicate Number

Medium16 co.

Medium

Arrays Bit Manipulation

also at 15 more

20

20.Largest Element

Easy6 co.

Easy

also at 5 more

21

21.Minimum Window Subsequence

Hard3 co.

Hard

also at 2 more

22

22.Rearrange array elements by sign

Medium11 co.

Medium

also at 10 more

23

23.Number of distinct substrings in a string

Medium6 co.

Medium

also at 5 more

24

24.Add two numbers in Linked List

Medium38 co.

Medium

also at 37 more

25

25.Expression Add Operators

Hard10 co.

Hard

Recursion & Backtracking Mathematics

also at 9 more

26

26.Count Substrings With K-Frequency Characters II

Medium8 co.

Medium

also at 7 more

27

27.Count the Number of Good Subsequences

Medium10 co.

Medium

also at 9 more

28

28.Remove K Digits

Medium22 co.

Medium

also at 21 more

29

29.Longest Substring With At Most K Distinct Characters

Medium15 co.

Medium

Strings Hashing

also at 14 more

30

30.Change Case of Each Character in a String

Easy3 co.

Easy

also at 2 more

31

31.Count the Number of Words in a Given String

Easy1 co.

Easy

also at 0 more

32

32.Longest Repeating Character Replacement

Medium22 co.

Medium

also at 21 more

33

33.Implement Trie II (Prefix Tree)

Medium6 co.

Medium

also at 5 more

34

34.Factor Combinations

Medium6 co.

Medium

Recursion & Backtracking

also at 5 more

35

35.Counting Elements

Easy5 co.

Easy

also at 4 more

36

Easy1 co.

Easy

also at 0 more

37

37.Find All Repeating Elements in an Array

Easy1 co.

Easy

also at 0 more

38

38.Sort a Linked List of 0's 1's and 2's

Medium10 co.

Medium

also at 9 more

39

39.Permutation Sequence

Medium5 co.

Medium

Recursion & Backtracking

also at 4 more

40

40.Count number of Nice subarrays

Medium13 co.

Medium

Arrays Hashing+1

also at 12 more

41

41.Maximum Area of Two Non-Overlapping Square Submatrices

Medium1 co.

Medium

also at 0 more

42

42.Palindrome Permutation II

Medium2 co.

Medium

Recursion & Backtracking

also at 1 more

43

Easy58 co.

Easy

also at 57 more

44

44.Find Distinct Expressions

Easy3 co.

Easy

also at 2 more

45

45.Trie Implementation and Advanced Operations

Medium20 co.

Medium

also at 19 more

46

46.Generate Parentheses

Medium32 co.

Medium

Recursion & Backtracking

also at 31 more

47

47.Find Middle of Linked List

Easy12 co.

Easy

also at 11 more

48

48.Maximum Product Subarray in an Array

Medium25 co.

Medium

also at 24 more

49

Medium7 co.

Medium

also at 6 more

50

50.Word Abbreviation

Hard2 co.

Hard

also at 1 more

…

Showing 1–50 of 165

Difficulty split

Easy52(32%)
Medium96(58%)
Hard17(10%)

Top topics

Arrays30
Hashing29
Strings28
Recursion & Backtracking26
Linked List14
Stack & Queues14