Arista Networks vs TCS Interview Questions
Arista Networks lists 39 LeetCode interview questions while TCS lists 228. They share 15 problems — 38% of Arista Networks's bank and 7% of TCS's. Focus on the overlap first, then drill into 24 Arista Networks-only and 213 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 15 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Arista Networks and TCS.
Step 2 — Company-specific depth: Add Arista Networks-specific problems like Construct String With Repeat Limit, Find the Town Judge, Reverse Nodes in k-Group and TCS-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: TCS skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
15 Shared Questions
High-priority problems to practice for both Arista Networks and TCS.
| Problem | Difficulty |
|---|---|
| Reorder List | Medium |
| Contains Duplicate II | Easy |
| Maximum Depth of Binary Tree | Easy |
| Missing Number | Easy |
| LRU Cache | Medium |
| Search in Rotated Sorted Array | Medium |
| Permutations | Medium |
| Longest Palindromic Substring | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Remove All Occurrences of a Substring | Medium |
| Maximum Subarray | Medium |
| Swap Nodes in Pairs | Medium |
| Top K Frequent Elements | Medium |
| Valid Palindrome | Easy |
| Merge Two Sorted Lists | Easy |
Unique to Arista Networks (24)
Problems in Arista Networks's list that do not appear at TCS.
| Problem | Difficulty |
|---|---|
| Construct String With Repeat Limit | Medium |
| Find the Town Judge | Easy |
| Reverse Nodes in k-Group | Hard |
| Restore IP Addresses | Medium |
| Course Schedule II | Medium |
| Reverse Linked List II | Medium |
| Remove Linked List Elements | Easy |
| Inorder Successor in BST II | Medium |
| Copy List with Random Pointer | Medium |
| Rotated Digits | Medium |
| Maximum Units on a Truck | Easy |
| Simplify Path | Medium |
Unique to TCS (213)
Problems in TCS's list that do not appear at Arista Networks.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Two Sum | Easy |
| Palindrome Number | Easy |
| Move Zeroes | Easy |
| Majority Element | Easy |
| Longest Common Prefix | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Sort Colors | Medium |
| Valid Anagram | Easy |
| Find the Index of the First Occurrence in a String | Easy |
| Single Number | Easy |
| Second Highest Salary | Medium |
Frequently Asked Questions
How many LeetCode questions do Arista Networks and TCS share?
Arista Networks and TCS share 15 LeetCode interview questions. 24 problems appear only in Arista Networks's list and 213 appear only in TCS's list.
What topics overlap most between Arista Networks and TCS?
The most common shared topics between Arista Networks and TCS are Array (6 shared questions), Hash Table (5 shared questions), Linked List (4 shared questions), String (4 shared questions), Two Pointers (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Arista Networks or TCS?
Arista Networks has 12 Easy, 26 Medium, and 1 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. TCS has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Arista Networks and TCS?
Start with the 15 shared problems since they cover what both companies ask most often. Then add 20 Arista Networks-specific and 20 TCS-specific questions to round out your prep.