ServiceNow vs TCS Interview Questions
ServiceNow lists 71 LeetCode interview questions while TCS lists 228. They share 40 problems — 56% of ServiceNow's bank and 18% of TCS's. Focus on the overlap first, then drill into 31 ServiceNow-only and 188 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 40 overlapping problems first. These are the highest-yield questions for candidates interviewing at both ServiceNow and TCS.
Step 2 — Company-specific depth: Add ServiceNow-specific problems like Number of Distinct Roll Sequences, Lexicographically Smallest String After Operations With Constraint, Find Minimum Diameter After Merging Two Trees and TCS-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
40 Shared Questions
High-priority problems to practice for both ServiceNow and TCS.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Trapping Rain Water | Hard |
| Number of Islands | Medium |
| Generate Parentheses | Medium |
| String Compression | Medium |
| Valid Parentheses | Easy |
| Container With Most Water | Medium |
| First Missing Positive | Hard |
| Sliding Window Maximum | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Group Anagrams | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Move Zeroes | Easy |
| Set Matrix Zeroes | Medium |
| Jump Game II | Medium |
| Merge Two Sorted Lists | Easy |
| Maximum Subarray | Medium |
| Rotting Oranges | Medium |
| Median of Two Sorted Arrays | Hard |
| Zigzag Conversion | Medium |
| Merge Intervals | Medium |
| Largest Number | Medium |
| Daily Temperatures | Medium |
| Maximum Product Subarray | Medium |
| Reverse Linked List | Easy |
| Pow(x, n) | Medium |
| Palindrome Linked List | Easy |
Showing top 30 of 40 shared problems.
Unique to ServiceNow (31)
Problems in ServiceNow's list that do not appear at TCS.
Unique to TCS (188)
Problems in TCS's list that do not appear at ServiceNow.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Palindrome Number | Easy |
| Majority Element | Easy |
| Longest Common Prefix | Easy |
| Valid Anagram | Easy |
| Find the Index of the First Occurrence in a String | Easy |
| Single Number | Easy |
| Second Highest Salary | Medium |
| Rotate Array | Medium |
| Remove Duplicates from Sorted Array | Easy |
| 3Sum | Medium |
| Reverse Integer | Medium |
Frequently Asked Questions
How many LeetCode questions do ServiceNow and TCS share?
ServiceNow and TCS share 40 LeetCode interview questions. 31 problems appear only in ServiceNow's list and 188 appear only in TCS's list.
What topics overlap most between ServiceNow and TCS?
The most common shared topics between ServiceNow and TCS are Array (19 shared questions), String (8 shared questions), Dynamic Programming (8 shared questions), Hash Table (6 shared questions), Two Pointers (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: ServiceNow or TCS?
ServiceNow has 7 Easy, 51 Medium, and 13 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. ServiceNow has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both ServiceNow and TCS?
Start with the 40 shared problems since they cover what both companies ask most often. Then add 20 ServiceNow-specific and 20 TCS-specific questions to round out your prep.