Cognizant vs Deloitte Interview Questions
Cognizant lists 29 LeetCode interview questions while Deloitte lists 43. They share 13 problems — 45% of Cognizant's bank and 30% of Deloitte's. Focus on the overlap first, then drill into 16 Cognizant-only and 30 Deloitte-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 13 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and Deloitte.
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 Deloitte-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Deloitte skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
13 Shared Questions
High-priority problems to practice for both Cognizant and Deloitte.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Second Highest Salary | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Longest Common Prefix | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Maximum Subarray | Medium |
| Valid Parentheses | Easy |
| Longest Substring Without Repeating Characters | Medium |
| 3Sum | Medium |
| Rising Temperature | Easy |
Unique to Cognizant (16)
Problems in Cognizant's list that do not appear at Deloitte.
| Problem | Difficulty |
|---|---|
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Fibonacci Number | Easy |
| Reverse Integer | Medium |
| Product Sales Analysis I | Easy |
| Median of Two Sorted Arrays | Hard |
| Merge Sorted Array | Easy |
| Count Primes | Medium |
| Happy Number | Easy |
| Move Zeroes | Easy |
| Binary Search | Easy |
| Merge Two Sorted Lists | Easy |
Unique to Deloitte (30)
Problems in Deloitte's list that do not appear at Cognizant.
| Problem | Difficulty |
|---|---|
| Merge k Sorted Lists | Hard |
| Change Null Values in a Table to the Previous Value | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Container With Most Water | Medium |
| Climbing Stairs | Easy |
| Valid Palindrome | Easy |
| Add Binary | Easy |
| Minimum Time to Repair Cars | Medium |
| Merge Intervals | Medium |
| First Unique Character in a String | Easy |
| Nth Highest Salary | Medium |
| Group Anagrams | Medium |
Frequently Asked Questions
How many LeetCode questions do Cognizant and Deloitte share?
Cognizant and Deloitte share 13 LeetCode interview questions. 16 problems appear only in Cognizant's list and 30 appear only in Deloitte's list.
What topics overlap most between Cognizant and Deloitte?
The most common shared topics between Cognizant and Deloitte are String (5 shared questions), Array (4 shared questions), Hash Table (3 shared questions), Two Pointers (3 shared questions), Database (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or Deloitte?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. Deloitte has 17 Easy, 23 Medium, and 3 Hard questions. Deloitte has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and Deloitte?
Start with the 13 shared problems since they cover what both companies ask most often. Then add 16 Cognizant-specific and 20 Deloitte-specific questions to round out your prep.