Cognizant vs TikTok Interview Questions
Cognizant lists 29 LeetCode interview questions while TikTok lists 351. They share 12 problems — 41% of Cognizant's bank and 3% of TikTok's. Focus on the overlap first, then drill into 17 Cognizant-only and 339 TikTok-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 12 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and TikTok.
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 TikTok-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: TikTok skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
12 Shared Questions
High-priority problems to practice for both Cognizant and TikTok.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Longest Common Prefix | Easy |
| Maximum Subarray | Medium |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| 3Sum | Medium |
| Happy Number | Easy |
| Move Zeroes | Easy |
| Merge Two Sorted Lists | Easy |
| Add Two Numbers | Medium |
Unique to Cognizant (17)
Problems in Cognizant's list that do not appear at TikTok.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Fibonacci Number | Easy |
| Valid Anagram | Easy |
| Second Highest Salary | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Reverse Integer | Medium |
| Product Sales Analysis I | Easy |
| Merge Sorted Array | Easy |
| Count Primes | Medium |
Unique to TikTok (339)
Problems in TikTok's list that do not appear at Cognizant.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Number of Islands | Medium |
| Longest Increasing Subsequence | Medium |
| Number of Distinct Islands | Medium |
| Meeting Rooms II | Medium |
| Course Schedule II | Medium |
| Merge Intervals | Medium |
| Course Schedule | Medium |
| Trapping Rain Water | Hard |
| Subarray With Elements Greater Than Varying Threshold | Hard |
| Text Justification | Hard |
| Decode String | Medium |
Frequently Asked Questions
How many LeetCode questions do Cognizant and TikTok share?
Cognizant and TikTok share 12 LeetCode interview questions. 17 problems appear only in Cognizant's list and 339 appear only in TikTok's list.
What topics overlap most between Cognizant and TikTok?
The most common shared topics between Cognizant and TikTok are Array (5 shared questions), Two Pointers (4 shared questions), String (4 shared questions), Hash Table (3 shared questions), Dynamic Programming (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or TikTok?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. TikTok has 34 Easy, 245 Medium, and 72 Hard questions. TikTok has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and TikTok?
Start with the 12 shared problems since they cover what both companies ask most often. Then add 17 Cognizant-specific and 20 TikTok-specific questions to round out your prep.