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Previous Year Questions

Minimum Genetic Mutation

Design Log Storage System

Reaching Points

Flatten Nested List Iterator

Best Meeting Point

Insert Interval

Alien Dictionary

Validate IP Address

Investments in 2016

Palindromic Substrings

Valid Parentheses

Masking Personal Information

Number of Music Playlists

Count Student Number in Departments

One Edit Distance

Text Justification

Merge Intervals

Find Median from Data Stream

Range Sum Query - Mutable

Trapping Rain Water

Minimum Number of Taps to Open to Water a Garden

The Skyline Problem

Minimum Increment to Make Array Unique

Max Points on a Line

Regular Expression Matching

Tweet Counts Per frequency

Flatten 2D Vector

Number of Islands

K-diff Pairs in an Array

Insert Delete GetRandom O(1)

Random Pick with Weight

Largest Rectangle in Histogram

Customer Placing the Largest Number of Orders

Implement Trie (Prefix Tree)

Integer to Roman

Permutation Sequence

Multiply Strings

Merge k Sorted Lists

Encode and Decode Strings

Moving Average from Data Stream

Reorganize String

Time Based Key-Value Store

Robot Bounded In Circle

Sliding Window Maximum

Single Element in a Sorted Array

Lowest Common Ancestor of a Binary Search Tree

Binary Tree Pruning

Wildcard Matching

Next Greater Element I

License Key Formatting

Binary Tree Maximum Path Sum

Pascal's Triangle

Reverse Linked List

Minimum Window Substring

Construct Binary Tree from Preorder and Inorder Traversal

Course Schedule II

Majority Element

Construct Binary Tree from Inorder and Postorder Traversal

Number of Connected Components in an Undirected Graph

Kth Smallest Element in a Sorted Matrix

Trapping Rain Water II

Design Skiplist

Minimum Number of Steps to Make Two Strings Anagram

Rectangles Area

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