All American Express Coding Interview Questions
23 questions we track for American Express, most frequently asked first. Practice any of them in the code editor and get AI feedback on your solution.
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- Junior39% (9)
- Mid/Senior43% (10)
- Staff17% (4)
Questions
- Two Sum129 companiesJunior
- Longest Substring Without Repeating Characters112 companiesMid/Senior
- Longest Common Prefix57 companiesJunior
- 3Sum61 companiesMid/Senior
- Trapping Rain Water78 companiesStaff
- Permutations26 companiesMid/Senior
- Best Time to Buy and Sell Stock90 companiesJunior
- Valid Palindrome44 companiesJunior
- Rotate Array28 companiesMid/Senior
- Isomorphic Strings15 companiesJunior
- Valid Anagram38 companiesJunior
- Ugly Number III3 companiesMid/Senior
- Maximum Equal Frequency1 companyStaff
- Find N Unique Integers Sum up to Zero6 companiesJunior
- Find a Value of a Mysterious Function Closest to Target1 companyStaff
- Minimum Deletions to Make Character Frequencies Unique6 companiesMid/Senior
- Equal Sum Arrays With Minimum Number of Operations1 companyMid/Senior
- Maximize the Topmost Element After K Moves1 companyMid/Senior
- Percentage of Letter in String1 companyJunior
- Maximum XOR After Operations2 companiesMid/Senior
- Minimum Number of Operations to Make Array XOR Equal to K3 companiesMid/Senior
- Divide an Array Into Subarrays With Minimum Cost I6 companiesJunior
- Divide an Array Into Subarrays With Minimum Cost II4 companiesStaff