American Express vs Cognizant Interview Questions
American Express lists 23 LeetCode interview questions while Cognizant lists 29. They share 5 problems — 22% of American Express's bank and 17% of Cognizant's. Focus on the overlap first, then drill into 18 American Express-only and 24 Cognizant-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 Cognizant.
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 Cognizant-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
5 Shared Questions
High-priority problems to practice for both American Express and Cognizant.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Valid Anagram | Easy |
| Longest Substring Without Repeating Characters | Medium |
| 3Sum | Medium |
| Longest Common Prefix | Easy |
Unique to American Express (18)
Problems in American Express's list that do not appear at Cognizant.
Unique to Cognizant (24)
Problems in Cognizant's list that do not appear at American Express.
Frequently Asked Questions
How many LeetCode questions do American Express and Cognizant share?
American Express and Cognizant share 5 LeetCode interview questions. 18 problems appear only in American Express's list and 24 appear only in Cognizant's list.
What topics overlap most between American Express and Cognizant?
The most common shared topics between American Express and Cognizant are Array (3 shared questions), Hash Table (3 shared questions), String (3 shared questions), Sorting (2 shared questions), Sliding Window (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Cognizant?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Cognizant has 18 Easy, 10 Medium, and 1 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 Cognizant?
Start with the 5 shared problems since they cover what both companies ask most often. Then add 18 American Express-specific and 20 Cognizant-specific questions to round out your prep.