All Oracle Coding Interview Questions
289 questions we track for Oracle, most frequently asked first. Practice any of them in the code editor and get AI feedback on your solution.
Start your Oracle mock interviewQuestions Oracle asks, live voice, scored. First one free.
- Junior20% (59)
- Mid/Senior61% (176)
- Staff19% (54)
Questionspage 2 of 3
- Binary Tree Right Side View15 companiesMid/Senior
- Number of Islands81 companiesMid/Senior
- Happy Number27 companiesJunior
- Remove Linked List Elements8 companiesJunior
- Isomorphic Strings15 companiesJunior
- Reverse Linked List34 companiesJunior
- Course Schedule41 companiesMid/Senior
- Minimum Size Subarray Sum18 companiesMid/Senior
- Course Schedule II35 companiesMid/Senior
- Word Search II20 companiesStaff
- Kth Largest Element in an Array42 companiesMid/Senior
- Contains Duplicate21 companiesJunior
- Maximal Square28 companiesMid/Senior
- Basic Calculator23 companiesStaff
- Invert Binary Tree10 companiesJunior
- Basic Calculator II33 companiesMid/Senior
- Kth Smallest Element in a BST11 companiesMid/Senior
- Palindrome Linked List16 companiesJunior
- Lowest Common Ancestor of a Binary Tree22 companiesMid/Senior
- Product of Array Except Self44 companiesMid/Senior
- Sliding Window Maximum46 companiesStaff
- Search a 2D Matrix II17 companiesMid/Senior
- Valid Anagram38 companiesJunior
- Meeting Rooms10 companiesJunior
- Meeting Rooms II43 companiesMid/Senior
- 3Sum Smaller7 companiesMid/Senior
- Single Number III7 companiesMid/Senior
- Missing Number19 companiesJunior
- Alien Dictionary17 companiesStaff
- Closest Binary Search Tree Value9 companiesJunior
- Integer to English Words23 companiesStaff
- Move Zeroes47 companiesJunior
- Find the Duplicate Number22 companiesMid/Senior
- Longest Increasing Subsequence31 companiesMid/Senior
- Remove Invalid Parentheses10 companiesStaff
- Sparse Matrix Multiplication9 companiesMid/Senior
- Binary Tree Vertical Order Traversal10 companiesMid/Senior
- Create Maximum Number7 companiesStaff
- Coin Change42 companiesMid/Senior
- Maximum Size Subarray Sum Equals k8 companiesMid/Senior
- Count of Range Sum4 companiesStaff
- Counting Bits10 companiesJunior
- Longest Substring with At Most K Distinct Characters12 companiesMid/Senior
- Reverse Vowels of a String12 companiesJunior
- Top K Frequent Elements52 companiesMid/Senior
- Water and Jug Problem8 companiesMid/Senior
- Find Leaves of Binary Tree6 companiesMid/Senior
- Largest Divisible Subset6 companiesMid/Senior
- Find K Pairs with Smallest Sums10 companiesMid/Senior
- Kth Smallest Element in a Sorted Matrix10 companiesMid/Senior
- First Unique Character in a String26 companiesJunior
- Decode String40 companiesMid/Senior
- Remove K Digits23 companiesMid/Senior
- Frog Jump10 companiesStaff
- Trapping Rain Water II14 companiesStaff
- Split Array Largest Sum19 companiesStaff
- Add Strings14 companiesJunior
- Non-overlapping Intervals18 companiesMid/Senior
- Find All Duplicates in an Array11 companiesMid/Senior
- String Compression38 companiesMid/Senior
- Add Two Numbers II8 companiesMid/Senior
- Delete Node in a BST11 companiesMid/Senior
- Island Perimeter10 companiesJunior
- Validate IP Address12 companiesMid/Senior
- Next Greater Element I16 companiesJunior
- Diagonal Traverse12 companiesMid/Senior
- The Maze II6 companiesMid/Senior
- Contiguous Array14 companiesMid/Senior
- Single Element in a Sorted Array18 companiesMid/Senior
- Diameter of Binary Tree19 companiesJunior
- Boundary of Binary Tree13 companiesMid/Senior
- Next Greater Element III13 companiesMid/Senior
- Subarray Sum Equals K46 companiesMid/Senior
- Permutation in String16 companiesMid/Senior
- Can Place Flowers16 companiesJunior
- Task Scheduler25 companiesMid/Senior
- Palindromic Substrings25 companiesMid/Senior
- Redundant Connection8 companiesMid/Senior
- Top K Frequent Words24 companiesMid/Senior
- Number of Distinct Islands14 companiesMid/Senior
- Max Area of Island19 companiesMid/Senior
- Count Binary Substrings18 companiesJunior
- Degree of an Array11 companiesJunior
- Binary Search12 companiesJunior
- Subarray Product Less Than K19 companiesMid/Senior
- Flood Fill12 companiesJunior
- Asteroid Collision34 companiesMid/Senior
- Daily Temperatures31 companiesMid/Senior
- Open the Lock15 companiesMid/Senior
- Reorganize String21 companiesMid/Senior
- Basic Calculator III14 companiesStaff
- Rotate String12 companiesJunior
- Bus Routes17 companiesStaff
- Consecutive Numbers Sum8 companiesStaff
- Keys and Rooms10 companiesMid/Senior
- Backspace String Compare14 companiesJunior
- Longest Mountain in Array10 companiesMid/Senior
- All Nodes Distance K in Binary Tree13 companiesMid/Senior
- Leaf-Similar Trees6 companiesJunior
- Koko Eating Bananas38 companiesMid/Senior