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Oracle Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real Oracle interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

top-specificoracle-prep
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340
Longest Substring Of All Vowels in Order
Unique Binary Search Trees
Spiral Matrix
Asteroid Collision3 Months
Minimize Maximum of Array
Top K Frequent Words
Valid Parentheses3 Months
Min Stack3 Months
Avoid Flood in The City3 Months
Jump Game II
Max Stack
Minimum Number of Steps to Make Two Strings Anagram
Second Highest Salary6 Months
Make Array Non-decreasing or Non-increasing
Pancake Sorting
Reverse Linked List6 Months
Subarray Product Less Than K
Meeting Rooms II30 Days
Design Authentication Manager
Kth Smallest Element in a Sorted Matrix3 Months
Design HashMap6 Months
Open the Lock30 Days
Validate IP Address
Maximum Good People Based on Statements
Reformat Date
Count the Number of Infection Sequences6 Months
Zigzag Conversion
Course Schedule II3 Months
Find Common Characters
Maximize Greatness of an Array
Serialize and Deserialize Binary Tree
Maximum Depth of Binary Tree
Path Sum III
Clone Graph
Diameter of Binary Tree30 Days
Two Sum IV - Input is a BST
Alien Dictionary
Maximum Number of Non-overlapping Palindrome Substrings6 Months
Longest Palindromic Substring6 Months
Product of Array Except Self
Search Suggestions System
Merge Intervals
K Closest Points to Origin
Encode and Decode Strings
Trapping Rain Water3 Months
Invalid Transactions3 Months
Two City Scheduling
Time Based Key-Value Store3 Months
Climbing Stairs6 Months
Generate Parentheses
Next Permutation
Split Array Largest Sum
All Nodes Distance K in Binary Tree
Koko Eating Bananas6 Months
Kth Smallest Element in a BST6 Months
Copy List with Random Pointer6 Months
Longest Substring Without Repeating Characters3 Months
Pow(x, n)
Basic Calculator III
Count Ways To Build Good Strings
First Missing Positive
Calculate Amount Paid in Taxes
Task Scheduler
Basic Calculator II
My Calendar I
Sqrt(x)6 Months
Minimum Window Substring30 Days
Minimum Knight Moves
Find All Numbers Disappeared in an Array
Daily Temperatures
Wildcard Matching
Convert Binary Number in a Linked List to Integer3 Months
Rotate Image
Valid Sudoku
Regular Expression Matching
Number of Visible People in a Queue3 Months
Maximum Profit in Job Scheduling3 Months
Permutation in String
Largest Number
Capacity To Ship Packages Within D Days6 Months
Merge Sorted Array
String Compression
Longest Common Subsequence
Single Element in a Sorted Array6 Months
Basic Calculator
Non-overlapping Intervals
Bus Routes6 Months
Word Search II
Making A Large Island
Two Sum30 Days
Design Circular Queue
Combination Sum
Roman to Integer
Longest Valid Parentheses
LFU Cache3 Months
Number of Islands3 Months
Two Sum II - Input Array Is Sorted
Logger Rate Limiter6 Months
Count and Say
Design In-Memory File System6 Months
Find the Smallest Divisor Given a Threshold
Insert Interval
Binary Tree Cameras
Palindromic Substrings6 Months
Search a 2D Matrix II
Maximize Value of Function in a Ball Passing Game
Rotting Oranges6 Months
Backspace String Compare
Course Schedule3 Months
Single Number III
Maximal Square
Longest Common Prefix
Maximum Earnings From Taxi
Insert Delete GetRandom O(1)
Container With Most Water30 Days
Find Valid Pair of Adjacent Digits in String
Frog Jump
Minimum Edge Reversals So Every Node Is Reachable6 Months
Minimum Sideway Jumps
Restore IP Addresses
Set Matrix Zeroes
Minimum Cost Path with Edge Reversals3 Months
Search in Rotated Sorted Array3 Months
Remove K Digits
Collect Coins in a Tree
Count Binary Substrings6 Months
Move Zeroes
Linked List Cycle II
Reverse Words in a String6 Months
Maximum Subarray3 Months
Contains Duplicate
Count Vowel Substrings of a String
Decode String6 Months
Edit Distance
Word Ladder3 Months
LRU Cache30 Days
Trapping Rain Water II
Isomorphic Strings
Permutations6 Months
Binary Tree Right Side View
Best Time to Buy and Sell Stock II
Island Perimeter
Count Substrings Without Repeating Character
Contiguous Array6 Months
Valid Anagram6 Months
Median of Two Sorted Arrays3 Months
Pour Water
Minimum Remove to Make Valid Parentheses6 Months
Largest Rectangle in Histogram
Greatest Common Divisor of Strings
Integer to Roman
Decode Ways
Lucky Numbers in a Matrix
Word Break II
Multiply Strings
N-Queens
Leaf-Similar Trees
Diagonal Traverse6 Months
Reorder List
Delete Node in a BST6 Months
All Ancestors of a Node in a Directed Acyclic Graph
Max Consecutive Ones III
Simplify Path
Count Ways to Group Overlapping Ranges
Minimum One Bit Operations to Make Integers Zero6 Months
Subarray Sum Equals K
Longest Substring with At Most K Distinct Characters
Count the Number of Houses at a Certain Distance II
Maximum Profit From Trading Stocks6 Months
Add Two Numbers
Design Add and Search Words Data Structure
Letter Combinations of a Phone Number
Gas Station
Remove All Adjacent Duplicates in String II3 Months
Convert Binary Search Tree to Sorted Doubly Linked List
Find the Duplicate Number
Binary Tree Maximum Path Sum
Triangle
Implement Trie (Prefix Tree)6 Months
Count the Number of Houses at a Certain Distance I
Word Squares II
Count Distinct Numbers on Board
Subarrays with K Different Integers
Group Anagrams6 Months
Remove Linked List Elements
Minimum Absolute Difference6 Months
Sort Colors6 Months
Valid Palindrome6 Months
Majority Element3 Months
Remove Invalid Parentheses
Average Selling Price
Pairs of Songs With Total Durations Divisible by 60
Best Time to Buy and Sell Stock3 Months
Lowest Common Ancestor of a Binary Tree6 Months
Find All Duplicates in an Array
Top K Frequent Elements3 Months
Merge Two Sorted Lists6 Months
Minimize Length of Array Using Operations
Palindrome Number
Word Search
Number of Students Unable to Eat Lunch
Jump Game
3Sum6 Months
Rotate Array
Merge k Sorted Lists3 Months
HTML Entity Parser
The Maze II
Longest Increasing Subsequence
Number of Flowers in Full Bloom
Fraction to Recurring Decimal
Fizz Buzz
First Unique Character in a String
Remove Duplicate Letters
Sort Array by Increasing Frequency
Find Peak Element
Missing Number
Sort List6 Months
Vertical Order Traversal of a Binary Tree3 Months
Max Area of Island3 Months
Populating Next Right Pointers in Each Node
Find First and Last Position of Element in Sorted Array3 Months
Binary Tree Zigzag Level Order Traversal
Odd Even Linked List
Count Servers that Communicate
Count Pairs Of Similar Strings
Decrypt String from Alphabet to Integer Mapping6 Months
Maximum Number of Events That Can Be Attended6 Months
Meeting Rooms III6 Months
Reverse Vowels of a String
Word Break
Text Justification
Boundary of Binary Tree
Step-By-Step Directions From a Binary Tree Node to Another
Longest Mountain in Array3 Months
Divide Two Integers
Happy Number
Remove All Adjacent Duplicates In String
Integer to English Words6 Months
Find Minimum in Rotated Sorted Array
Sudoku Solver
Minimum Size Subarray Sum
Subsets
Merge Strings Alternately
Remove Nth Node From End of List
Longest Consecutive Sequence6 Months
Last Stone Weight
Number of Closed Islands6 Months
Reorganize String6 Months
Reverse Integer
Find Leaves of Binary Tree30 Days
Sliding Window Maximum6 Months
Add Strings
Find K Pairs with Smallest Sums
Next Greater Element I
Find the Winner of the Circular Game
Sort an Array
Add Two Numbers II3 Months
Design File System
Remove Duplicates from Sorted Array
Rotate String
Water and Jug Problem
Flatten Binary Tree to Linked List
House Robber
Path Sum II
Palindrome Linked List
Merge Operations to Turn Array Into a Palindrome
Number of Distinct Islands
Keys and Rooms
Minimum Cost to Make Array Equal
Next Greater Element III
3Sum Smaller
Kth Largest Element in an Array6 Months
Minimum Insertion Steps to Make a String Palindrome6 Months
Distinct Subsequences
Combination Sum II
Can Place Flowers
Consecutive Numbers Sum6 Months
Reverse Substrings Between Each Pair of Parentheses
Validate Binary Search Tree
Kill Process
Degree of an Array6 Months
Distance to a Cycle in Undirected Graph30 Days
Candy
Reverse Linked List II6 Months
Delete Node in a Linked List6 Months
Find Median from Data Stream
Unique Paths
Coin Change3 Months
Count Number of Nice Subarrays
Plates Between Candles
Design a Text Editor
Number of Music Playlists
Swapping Nodes in a Linked List
Minimum Number of Increments on Subarrays to Form a Target Array
Count Primes
Merge In Between Linked Lists6 Months
Binary Search
Kth Missing Positive Number3 Months
Get the Maximum Score
Merge Nodes in Between Zeros
Create Maximum Number
Evaluate Reverse Polish Notation6 Months
Maximum Size Subarray Sum Equals k
Bulb Switcher
Longest Palindrome
Minimum Array Sum6 Months
Remove Duplicates from Sorted List II
Rearranging Fruits
Linked List Cycle
Maximum Candies Allocated to K Children
Rotate List
Redundant Connection
Minimum Cost Homecoming of a Robot in a Grid
Cache With Time Limit
Shortest Path in a Grid with Obstacles Elimination
Letter Tile Possibilities
Minimum Operations to Halve Array Sum
Invert Binary Tree
Binary Tree Level Order Traversal II3 Months
Remove Duplicates from Sorted List
Sparse Matrix Multiplication
Swap Nodes in Pairs
Binary Tree Level Order Traversal3 Months
Count of Range Sum
Search a 2D Matrix
Counting Bits
Surrounded Regions6 Months
Search in a Binary Search Tree
Nested List Weight Sum
Largest Divisible Subset
Number of Valid Words in a Sentence
Element Appearing More Than 25% In Sorted Array
Least Number of Unique Integers after K Removals
Find in Mountain Array6 Months
Maximum Employees to Be Invited to a Meeting
Meeting Rooms6 Months
Closest Binary Search Tree Value
The kth Factor of n
Binary Tree Vertical Order Traversal
Minimum Cost to Cut a Stick