American Express vs Qualcomm Interview Questions
American Express lists 23 LeetCode interview questions while Qualcomm lists 62. They share 5 problems — 22% of American Express's bank and 8% of Qualcomm's. Focus on the overlap first, then drill into 18 American Express-only and 57 Qualcomm-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 5 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and Qualcomm.
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 Qualcomm-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Qualcomm skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
5 Shared Questions
High-priority problems to practice for both American Express and Qualcomm.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| 3Sum | Medium |
| Permutations | Medium |
| Longest Common Prefix | Easy |
Unique to American Express (18)
Problems in American Express's list that do not appear at Qualcomm.
Unique to Qualcomm (57)
Problems in Qualcomm's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| String Compression III | Medium |
| Maximum Number of Ones | Hard |
| Reverse Nodes in k-Group | Hard |
| Number of Islands | Medium |
| LRU Cache | Medium |
| Reverse Linked List | Easy |
| Valid Parentheses | Easy |
| Palindrome Number | Easy |
| Remove Nth Node From End of List | Medium |
| Reverse Bits | Easy |
| Rotate Image | Medium |
| Power of Two | Easy |
Frequently Asked Questions
How many LeetCode questions do American Express and Qualcomm share?
American Express and Qualcomm share 5 LeetCode interview questions. 18 problems appear only in American Express's list and 57 appear only in Qualcomm's list.
What topics overlap most between American Express and Qualcomm?
The most common shared topics between American Express and Qualcomm are Array (4 shared questions), Hash Table (2 shared questions), String (2 shared questions), Sliding Window (1 shared questions), Two Pointers (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Qualcomm?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Qualcomm has 28 Easy, 25 Medium, and 9 Hard questions. Qualcomm has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and Qualcomm?
Start with the 5 shared problems since they cover what both companies ask most often. Then add 18 American Express-specific and 20 Qualcomm-specific questions to round out your prep.