DoorDash vs Oracle Interview Questions
DoorDash lists 78 LeetCode interview questions while Oracle lists 314. They share 42 problems — 54% of DoorDash's bank and 13% of Oracle's. Focus on the overlap first, then drill into 36 DoorDash-only and 272 Oracle-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 42 overlapping problems first. These are the highest-yield questions for candidates interviewing at both DoorDash and Oracle.
Step 2 — Company-specific depth: Add DoorDash-specific problems like Walls and Gates, Longest Increasing Path in a Matrix, Single-Threaded CPU and Oracle-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
42 Shared Questions
High-priority problems to practice for both DoorDash and Oracle.
| Problem | Difficulty |
|---|---|
| Binary Tree Maximum Path Sum | Hard |
| Search Suggestions System | Medium |
| Maximum Profit in Job Scheduling | Hard |
| Koko Eating Bananas | Medium |
| Design File System | Medium |
| Design In-Memory File System | Hard |
| Next Greater Element III | Medium |
| Minimum Number of Steps to Make Two Strings Anagram | Medium |
| Basic Calculator III | Hard |
| Vertical Order Traversal of a Binary Tree | Hard |
| Implement Trie (Prefix Tree) | Medium |
| Course Schedule II | Medium |
| Next Permutation | Medium |
| Largest Rectangle in Histogram | Hard |
| Basic Calculator | Hard |
| Max Area of Island | Medium |
| Minimum Size Subarray Sum | Medium |
| Two Sum | Easy |
| Basic Calculator II | Medium |
| Serialize and Deserialize Binary Tree | Hard |
| Asteroid Collision | Medium |
| Word Search II | Hard |
| Sliding Window Maximum | Hard |
| Number of Islands | Medium |
| Course Schedule | Medium |
| Sudoku Solver | Hard |
| Jump Game | Medium |
| LRU Cache | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Merge k Sorted Lists | Hard |
Showing top 30 of 42 shared problems.
Unique to DoorDash (36)
Problems in DoorDash's list that do not appear at Oracle.
Unique to Oracle (272)
Problems in Oracle's list that do not appear at DoorDash.
| Problem | Difficulty |
|---|---|
| Longest Substring Without Repeating Characters | Medium |
| Top K Frequent Elements | Medium |
| Valid Parentheses | Easy |
| Meeting Rooms II | Medium |
| Spiral Matrix | Medium |
| Minimum One Bit Operations to Make Integers Zero | Hard |
| Search in Rotated Sorted Array | Medium |
| Remove All Adjacent Duplicates in String II | Medium |
| Container With Most Water | Medium |
| 3Sum | Medium |
| Reverse Linked List | Easy |
| Trapping Rain Water | Hard |
Frequently Asked Questions
How many LeetCode questions do DoorDash and Oracle share?
DoorDash and Oracle share 42 LeetCode interview questions. 36 problems appear only in DoorDash's list and 272 appear only in Oracle's list.
What topics overlap most between DoorDash and Oracle?
The most common shared topics between DoorDash and Oracle are Array (15 shared questions), String (11 shared questions), Hash Table (9 shared questions), Depth-First Search (7 shared questions), Design (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: DoorDash or Oracle?
DoorDash has 7 Easy, 45 Medium, and 26 Hard questions. Oracle has 61 Easy, 194 Medium, and 59 Hard questions. DoorDash has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both DoorDash and Oracle?
Start with the 42 shared problems since they cover what both companies ask most often. Then add 20 DoorDash-specific and 20 Oracle-specific questions to round out your prep.