Cognizant vs Qualcomm Interview Questions
Cognizant lists 29 LeetCode interview questions while Qualcomm lists 62. They share 12 problems — 41% of Cognizant's bank and 19% of Qualcomm's. Focus on the overlap first, then drill into 17 Cognizant-only and 50 Qualcomm-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 12 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and Qualcomm.
Step 2 — Company-specific depth: Add Cognizant-specific problems like Count Subarrays of Length Three With a Condition, Smallest Value of the Rearranged Number, Fibonacci Number 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
12 Shared Questions
High-priority problems to practice for both Cognizant and Qualcomm.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Two Sum | Easy |
| Remove Duplicates from Sorted Array | Easy |
| Longest Common Prefix | Easy |
| Reverse Integer | Medium |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Merge Sorted Array | Easy |
| 3Sum | Medium |
| Move Zeroes | Easy |
| Merge Two Sorted Lists | Easy |
Unique to Cognizant (17)
Problems in Cognizant's list that do not appear at Qualcomm.
| Problem | Difficulty |
|---|---|
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Fibonacci Number | Easy |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Second Highest Salary | Medium |
| Managers with at Least 5 Direct Reports | Medium |
| Maximum Subarray | Medium |
| Product Sales Analysis I | Easy |
| Count Primes | Medium |
| Happy Number | Easy |
| Binary Search | Easy |
Unique to Qualcomm (50)
Problems in Qualcomm's list that do not appear at Cognizant.
| 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 |
| Remove Nth Node From End of List | Medium |
| Reverse Bits | Easy |
| Rotate Image | Medium |
| Power of Two | Easy |
| Rectangle Overlap | Easy |
| Linked List Cycle | Easy |
Frequently Asked Questions
How many LeetCode questions do Cognizant and Qualcomm share?
Cognizant and Qualcomm share 12 LeetCode interview questions. 17 problems appear only in Cognizant's list and 50 appear only in Qualcomm's list.
What topics overlap most between Cognizant and Qualcomm?
The most common shared topics between Cognizant and Qualcomm are Array (6 shared questions), Two Pointers (4 shared questions), String (3 shared questions), Math (2 shared questions), Hash Table (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or Qualcomm?
Cognizant has 18 Easy, 10 Medium, and 1 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 Cognizant and Qualcomm?
Start with the 12 shared problems since they cover what both companies ask most often. Then add 17 Cognizant-specific and 20 Qualcomm-specific questions to round out your prep.