Oracle | BeyondBasics

Oracle

Previous Year Questions

Data Stream as Disjoint Intervals

Delete Node in a BST

Design Hit Counter

Merge k Sorted Lists

Meeting Rooms II

Number of Islands

Serialize and Deserialize Binary Tree

Merge Intervals

Basic Calculator II

Letter Combinations of a Phone Number

Set Matrix Zeroes

Search in Rotated Sorted Array

Maximum Subarray

Web Crawler Multithreaded

Exclusive Time of Functions

Top K Frequent Words

Minimum Index Sum of Two Lists

Binary Search Tree Iterator

Valid Parentheses

Encode and Decode TinyURL

Boundary of Binary Tree

Design Bounded Blocking Queue

Remove Comments

Reverse Substrings Between Each Pair of Parentheses

Lowest Common Ancestor of a Binary Tree

Implement Queue using Stacks

Copy List with Random Pointer

Convert Binary Search Tree to Sorted Doubly Linked List

Trapping Rain Water

Reverse Linked List

Find All Anagrams in a String

Insert Delete GetRandom O(1)

Team Scores in Football Tournament

Product of Array Except Self

Kth Smallest Element in a BST

Add Two Numbers

Multiply Strings

Find Duplicate File in System

Intersection of Two Arrays

Best Time to Buy and Sell Stock

Linked List Cycle

Binary Tree Vertical Order Traversal

Merge Two Sorted Lists

All Nodes Distance K in Binary Tree

Find First and Last Position of Element in Sorted Array

Implement Trie (Prefix Tree)

Regular Expression Matching

Longest Palindromic Substring

Longest Duplicate Substring

Median of Two Sorted Arrays

Longest Substring Without Repeating Characters

Shortest Palindrome

Check Completeness of a Binary Tree

Number of Distinct Islands

Course Schedule

Intersection of Two Linked Lists

Next Greater Element II

Univalued Binary Tree

Find Median from Data Stream

Integer to English Words

Pacific Atlantic Water Flow

Integer to Roman

Roman to Integer

Kth Largest Element in an Array

Valid Tic-Tac-Toe State

Shortest Word Distance

Find Duplicate Subtrees

Convert Sorted List to Binary Search Tree

Serialize and Deserialize BST

Populating Next Right Pointers in Each Node

Flatten Binary Tree to Linked List

Divide Two Integers

Insert Interval

Flatten Nested List Iterator

Isomorphic Strings

Peeking Iterator

Binary Tree Right Side View

Subarray Sum Equals K

Minimum Knight Moves

Compare Strings by Frequency of the Smallest Character

Number of Islands II

First Missing Positive

Longest Valid Parentheses

Longest Consecutive Sequence

Reverse Integer

Minimum Window Substring

Rectangle Overlap

All Possible Full Binary Trees

Binary Tree Inorder Traversal

Reorganize String

Longest Common Prefix

Minimum Size Subarray Sum

Lowest Common Ancestor of a Binary Search Tree

Max Area of Island

Add Two Numbers II

Valid Palindrome

Middle of the Linked List

Search a 2D Matrix II

Department Highest Salary

K-diff Pairs in an Array

Reverse Linked List II

Construct Binary Search Tree from Preorder Traversal

Swap Nodes in Pairs

Remove Nth Node From End of List

K Closest Points to Origin

Spiral Matrix II

Construct Binary Tree from Preorder and Inorder Traversal

Diameter of Binary Tree

Intersection of Two Arrays II

Evaluate Reverse Polish Notation

Reverse Words in a String

Top K Frequent Elements

Next Greater Element I

Majority Element

Range Sum of BST

Binary Tree Zigzag Level Order Traversal

All Elements in Two Binary Search Trees

Validate Binary Search Tree

Remove Duplicates from Sorted Array

Backspace String Compare

Design Circular Queue

Time Based Key-Value Store

Maximum Product Subarray

Longest Increasing Subsequence

Palindrome Number

Merge Sorted Array

Merge Two Binary Trees

Sliding Window Maximum

Remove K Digits

Longest Substring with At Most K Distinct Characters

Contains Duplicate

Design Linked List

Binary Tree Level Order Traversal

Binary Tree Level Order Traversal II

Count of Smaller Numbers After Self

Wildcard Matching

Climbing Stairs

Best Time to Buy and Sell Stock II

Remove All Adjacent Duplicates In String

Convert Sorted Array to Binary Search Tree

Find the Duplicate Number

Container With Most Water

Interval List Intersections

Pascal's Triangle II

Course Schedule II

Populating Next Right Pointers in Each Node II

Most Common Word

Sort Array By Parity

Implement strStr()

String to Integer (atoi)

Find Minimum in Rotated Sorted Array

Squares of a Sorted Array

Lucky Numbers in a Matrix

HTML Entity Parser

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