Cognizant vs Oracle Interview Questions
Cognizant lists 29 LeetCode interview questions while Oracle lists 314. They share 19 problems — 66% of Cognizant's bank and 6% of Oracle's. Focus on the overlap first, then drill into 10 Cognizant-only and 295 Oracle-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 19 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and Oracle.
Step 2 — Company-specific depth: Add Cognizant-specific problems like Count Subarrays of Length Three With a Condition, Smallest Value of the Rearranged Number, Fibonacci Number and Oracle-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Oracle skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
19 Shared Questions
High-priority problems to practice for both Cognizant and Oracle.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Second Highest Salary | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Longest Common Prefix | Easy |
| Maximum Subarray | Medium |
| Reverse Integer | Medium |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Merge Sorted Array | Easy |
| 3Sum | Medium |
| Happy Number | Easy |
| Move Zeroes | Easy |
| Binary Search | Easy |
| Merge Two Sorted Lists | Easy |
| Add Two Numbers | Medium |
Unique to Cognizant (10)
Problems in Cognizant's list that do not appear at Oracle.
| Problem | Difficulty |
|---|---|
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Fibonacci Number | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Product Sales Analysis I | Easy |
| Count Primes | Medium |
| Fizz Buzz | Easy |
| Rising Temperature | Easy |
| Students and Examinations | Easy |
| Search Insert Position | Easy |
Unique to Oracle (295)
Problems in Oracle's list that do not appear at Cognizant.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Number of Islands | Medium |
| Group Anagrams | Medium |
| Top K Frequent Elements | Medium |
| Sliding Window Maximum | Hard |
| Merge k Sorted Lists | Hard |
| Merge Intervals | Medium |
| Meeting Rooms II | Medium |
| Spiral Matrix | Medium |
| Minimum One Bit Operations to Make Integers Zero | Hard |
| LFU Cache | Hard |
| Search in Rotated Sorted Array | Medium |
Frequently Asked Questions
How many LeetCode questions do Cognizant and Oracle share?
Cognizant and Oracle share 19 LeetCode interview questions. 10 problems appear only in Cognizant's list and 295 appear only in Oracle's list.
What topics overlap most between Cognizant and Oracle?
The most common shared topics between Cognizant and Oracle are Array (8 shared questions), Two Pointers (6 shared questions), String (5 shared questions), Math (4 shared questions), Hash Table (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or Oracle?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. Oracle has 61 Easy, 194 Medium, and 59 Hard questions. Oracle has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and Oracle?
Start with the 19 shared problems since they cover what both companies ask most often. Then add 10 Cognizant-specific and 20 Oracle-specific questions to round out your prep.