American Express vs Palo Alto Networks Interview Questions
American Express lists 23 LeetCode interview questions while Palo Alto Networks lists 46. They share 3 problems — 13% of American Express's bank and 7% of Palo Alto Networks's. Focus on the overlap first, then drill into 20 American Express-only and 43 Palo Alto Networks-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 3 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and Palo Alto Networks.
Step 2 — Company-specific depth: Add American Express-specific problems like Minimum Deletions to Make Character Frequencies Unique, Maximum Equal Frequency, Divide an Array Into Subarrays With Minimum Cost II and Palo Alto Networks-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: American Express skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
3 Shared Questions
High-priority problems to practice for both American Express and Palo Alto Networks.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Longest Common Prefix | Easy |
Unique to American Express (20)
Problems in American Express's list that do not appear at Palo Alto Networks.
Unique to Palo Alto Networks (43)
Problems in Palo Alto Networks's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Find the Longest Equal Subarray | Medium |
| Logger Rate Limiter | Easy |
| String Compression | Medium |
| Add Two Numbers | Medium |
| Design HashMap | Easy |
| Search in Rotated Sorted Array | Medium |
| Group Anagrams | Medium |
| Decode String | Medium |
| Minimum Number of Food Buckets to Feed the Hamsters | Medium |
| Min Stack | Medium |
| Binary Tree Level Order Traversal | Medium |
Frequently Asked Questions
How many LeetCode questions do American Express and Palo Alto Networks share?
American Express and Palo Alto Networks share 3 LeetCode interview questions. 20 problems appear only in American Express's list and 43 appear only in Palo Alto Networks's list.
What topics overlap most between American Express and Palo Alto Networks?
The most common shared topics between American Express and Palo Alto Networks are Array (2 shared questions), Hash Table (2 shared questions), String (2 shared questions), Sliding Window (1 shared questions), Trie (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Palo Alto Networks?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Palo Alto Networks has 12 Easy, 29 Medium, and 5 Hard questions. American Express has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and Palo Alto Networks?
Start with the 3 shared problems since they cover what both companies ask most often. Then add 20 American Express-specific and 20 Palo Alto Networks-specific questions to round out your prep.