American Express LeetCode Interview Questions
Practice 50 real coding problems frequently asked in American Express technical interviews. Master these questions to ace your next American Express software engineering interview.
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American Express Interview Problems
| Problem | DifficultyDiff | Action |
|---|---|---|
Rank Transform of a Matrix 100% | HardH | Solve→ |
Permutation in String 96% | MediumM | Solve→ |
Valid Palindrome 94% | EasyE | Solve→ |
Minimum Add to Make Parentheses Valid 94% | MediumM | Solve→ |
Longest Subarray of 1's After Deleting One Element 93% | MediumM | Solve→ |
Insert Delete GetRandom O(1) 93% | MediumM | Solve→ |
Lowest Common Ancestor of a Binary Tree 90% | MediumM | Solve→ |
Maximum Profit in Job Scheduling 89% | HardH | Solve→ |
Valid Sudoku 84% | MediumM | Solve→ |
Sum Root to Leaf Numbers 84% | MediumM | Solve→ |
Jump Game II 82% | MediumM | Solve→ |
Identify the Largest Outlier in an Array 82% | MediumM | Solve→ |
Accounts Merge 82% | MediumM | Solve→ |
Search a 2D Matrix 81% | MediumM | Solve→ |
Isomorphic Strings 80% | EasyE | Solve→ |
Design an Ordered Stream 78% | EasyE | Solve→ |
Remove Element 78% | EasyE | Solve→ |
Design HashMap 75% | EasyE | Solve→ |
Dot Product of Two Sparse Vectors 72% | MediumM | Solve→ |
Roman to Integer 69% | EasyE | Solve→ |
Is Subsequence 69% | EasyE | Solve→ |
Squares of a Sorted Array 67% | EasyE | Solve→ |
Majority Element 65% | EasyE | Solve→ |
Count Unhappy Friends 63% | MediumM | Solve→ |
Buildings With an Ocean View 63% | MediumM | Solve→ |
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Longest Increasing Path in a Matrix 63% | HardH | Solve→ |
Random Pick Index 60% | MediumM | Solve→ |
Product of Array Except Self 59% | MediumM | Solve→ |
Lowest Common Ancestor of a Binary Tree III 58% | MediumM | Solve→ |
Counting Bits 57% | EasyE | Solve→ |
Adding Spaces to a String 55% | MediumM | Solve→ |
Integer to English Words 54% | HardH | Solve→ |
Expression Add Operators 53% | HardH | Solve→ |
Sqrt(x) 51% | EasyE | Solve→ |
Remove All Occurrences of a Substring 49% | MediumM | Solve→ |
Range Sum of BST 49% | EasyE | Solve→ |
Convert Sorted List to Binary Search Tree 48% | MediumM | Solve→ |
Longest Increasing Subsequence 46% | MediumM | Solve→ |
Diameter of Binary Tree 44% | EasyE | Solve→ |
Binary Tree Zigzag Level Order Traversal 43% | MediumM | Solve→ |
Number of Ships in a Rectangle 42% | HardH | Solve→ |
Goat Latin 41% | EasyE | Solve→ |
Design Tic-Tac-Toe 37% | MediumM | Solve→ |
N-Queens 37% | HardH | Solve→ |
Combination Sum II 36% | MediumM | Solve→ |
K Closest Points to Origin 32% | MediumM | Solve→ |
Rank Teams by Votes 31% | MediumM | Solve→ |
Letter Combinations of a Phone Number 31% | MediumM | Solve→ |
Check if One String Swap Can Make Strings Equal 26% | EasyE | Solve→ |
Maximum Value at a Given Index in a Bounded Array 20% | MediumM | Solve→ |
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Frequently Asked Questions
What LeetCode problems does American Express ask in interviews?
American Express commonly asks 50 coding problems in technical interviews, including Rank Transform of a Matrix, Permutation in String, Valid Palindrome. The difficulty breakdown is 15 Easy, 28 Medium, and 7 Hard problems.
How should I prepare for a American Express coding interview?
Focus on the most frequently asked problems first, especially those with high frequency scores. American Express interviews typically emphasize Array and Hash Table. Practice explaining your thought process while coding.
What is the difficulty level of American Express coding interviews?
Based on our data, American Express interviews include 15 Easy (30%), 28 Medium (56%), and 7 Hard (14%) problems.
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