DoorDash vs TCS Interview Questions
DoorDash lists 78 LeetCode interview questions while TCS lists 228. They share 25 problems — 32% of DoorDash's bank and 11% of TCS's. Focus on the overlap first, then drill into 53 DoorDash-only and 203 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 25 overlapping problems first. These are the highest-yield questions for candidates interviewing at both DoorDash and TCS.
Step 2 — Company-specific depth: Add DoorDash-specific problems like Walls and Gates, Longest Increasing Path in a Matrix, Search Suggestions System and TCS-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: DoorDash skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
25 Shared Questions
High-priority problems to practice for both DoorDash and TCS.
| Problem | Difficulty |
|---|---|
| Binary Tree Maximum Path Sum | Hard |
| Koko Eating Bananas | Medium |
| Find K Closest Elements | Medium |
| Next Permutation | Medium |
| Largest Rectangle in Histogram | Hard |
| Minimum Size Subarray Sum | Medium |
| Two Sum | Easy |
| Serialize and Deserialize Binary Tree | Hard |
| Longest Common Subsequence | Medium |
| Sliding Window Maximum | Hard |
| Number of Islands | Medium |
| Jump Game | Medium |
| LRU Cache | Medium |
| 4Sum | Medium |
| Merge k Sorted Lists | Hard |
| Integer to Roman | Medium |
| Merge Intervals | Medium |
| Jump Game II | Medium |
| Maximum Gap | Medium |
| Group Anagrams | Medium |
| Longest Palindromic Substring | Medium |
| Roman to Integer | Easy |
| Diameter of Binary Tree | Easy |
| Rotting Oranges | Medium |
| Add Two Numbers | Medium |
Unique to DoorDash (53)
Problems in DoorDash's list that do not appear at TCS.
Unique to TCS (203)
Problems in TCS's list that do not appear at DoorDash.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Palindrome Number | Easy |
| Maximum Subarray | Medium |
| 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 DoorDash and TCS share?
DoorDash and TCS share 25 LeetCode interview questions. 53 problems appear only in DoorDash's list and 203 appear only in TCS's list.
What topics overlap most between DoorDash and TCS?
The most common shared topics between DoorDash and TCS are Array (15 shared questions), String (6 shared questions), Dynamic Programming (5 shared questions), Sorting (5 shared questions), Hash Table (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: DoorDash or TCS?
DoorDash has 7 Easy, 45 Medium, and 26 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. DoorDash has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both DoorDash and TCS?
Start with the 25 shared problems since they cover what both companies ask most often. Then add 20 DoorDash-specific and 20 TCS-specific questions to round out your prep.