Cognizant vs ServiceNow Interview Questions
Cognizant lists 29 LeetCode interview questions while ServiceNow lists 71. They share 8 problems — 28% of Cognizant's bank and 11% of ServiceNow's. Focus on the overlap first, then drill into 21 Cognizant-only and 63 ServiceNow-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 8 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and ServiceNow.
Step 2 — Company-specific depth: Add Cognizant-specific problems like Palindrome Number, Count Subarrays of Length Three With a Condition, Smallest Value of the Rearranged Number and ServiceNow-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: ServiceNow skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
8 Shared Questions
High-priority problems to practice for both Cognizant and ServiceNow.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Maximum Subarray | Medium |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Move Zeroes | Easy |
| Merge Two Sorted Lists | Easy |
Unique to Cognizant (21)
Problems in Cognizant's list that do not appear at ServiceNow.
Unique to ServiceNow (63)
Problems in ServiceNow's list that do not appear at Cognizant.
Frequently Asked Questions
How many LeetCode questions do Cognizant and ServiceNow share?
Cognizant and ServiceNow share 8 LeetCode interview questions. 21 problems appear only in Cognizant's list and 63 appear only in ServiceNow's list.
What topics overlap most between Cognizant and ServiceNow?
The most common shared topics between Cognizant and ServiceNow are Array (4 shared questions), String (3 shared questions), Hash Table (2 shared questions), Two Pointers (2 shared questions), Dynamic Programming (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or ServiceNow?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. ServiceNow has 7 Easy, 51 Medium, and 13 Hard questions. ServiceNow has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and ServiceNow?
Start with the 8 shared problems since they cover what both companies ask most often. Then add 20 Cognizant-specific and 20 ServiceNow-specific questions to round out your prep.