Oracle vs Siemens Interview Questions
Oracle lists 314 LeetCode interview questions while Siemens lists 25. They share 17 problems — 5% of Oracle's bank and 68% of Siemens's. Focus on the overlap first, then drill into 297 Oracle-only and 8 Siemens-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 17 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Oracle and Siemens.
Step 2 — Company-specific depth: Add Oracle-specific problems like Longest Substring Without Repeating Characters, Sliding Window Maximum, Merge k Sorted Lists and Siemens-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
17 Shared Questions
High-priority problems to practice for both Oracle and Siemens.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Number of Islands | Medium |
| Two Sum | Easy |
| Group Anagrams | Medium |
| Top K Frequent Elements | Medium |
| Valid Parentheses | Easy |
| Merge Intervals | Medium |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Best Time to Buy and Sell Stock | Easy |
| First Missing Positive | Hard |
| Palindrome Number | Easy |
| Merge Two Sorted Lists | Easy |
| Remove Duplicates from Sorted Array | Easy |
| Clone Graph | Medium |
| Rotate Array | Medium |
| Single Number III | Medium |
Unique to Oracle (297)
Problems in Oracle's list that do not appear at Siemens.
| Problem | Difficulty |
|---|---|
| Longest Substring Without Repeating Characters | Medium |
| Sliding Window Maximum | Hard |
| Merge k Sorted Lists | Hard |
| 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 |
| Asteroid Collision | Medium |
| Remove All Adjacent Duplicates in String II | Medium |
| Container With Most Water | Medium |
| 3Sum | Medium |
Unique to Siemens (8)
Problems in Siemens's list that do not appear at Oracle.
Frequently Asked Questions
How many LeetCode questions do Oracle and Siemens share?
Oracle and Siemens share 17 LeetCode interview questions. 297 problems appear only in Oracle's list and 8 appear only in Siemens's list.
What topics overlap most between Oracle and Siemens?
The most common shared topics between Oracle and Siemens are Array (10 shared questions), Hash Table (7 shared questions), String (4 shared questions), Sorting (4 shared questions), Two Pointers (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Oracle or Siemens?
Oracle has 61 Easy, 194 Medium, and 59 Hard questions. Siemens has 8 Easy, 13 Medium, and 4 Hard questions. Oracle has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Oracle and Siemens?
Start with the 17 shared problems since they cover what both companies ask most often. Then add 20 Oracle-specific and 8 Siemens-specific questions to round out your prep.