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Previous Year Questions

Boundary of Binary Tree

Merge k Sorted Lists

Number of Islands

Copy List with Random Pointer

Hand of Straights

Diagonal Traverse

Binary Tree Right Side View

Kth Largest Element in an Array

Basic Calculator II

Search in a Sorted Array of Unknown Size

Valid Parentheses

Serialize and Deserialize N-ary Tree

Median of Two Sorted Arrays

Binary Tree Cameras

Meeting Rooms II

Longest Palindromic Substring

Find Leaves of Binary Tree

Longest Substring Without Repeating Characters

Search in Rotated Sorted Array

Reverse Linked List

Find Median from Data Stream

Surrounded Regions

Linked List Cycle

Rearrange String k Distance Apart

Serialize and Deserialize BST

String Compression

Kth Largest Element in a Stream

Maximum Width Ramp

Count Univalue Subtrees

Relative Sort Array

Shortest Word Distance II

String to Integer (atoi)

Find Minimum in Rotated Sorted Array

Lowest Common Ancestor of a Binary Tree

Letter Combinations of a Phone Number

Odd Even Linked List

Search a 2D Matrix II

Serialize and Deserialize Binary Tree

Product of Array Except Self

Implement Trie (Prefix Tree)

Asteroid Collision

Maximum Subarray

Trapping Rain Water

Subarray Sum Equals K

Flatten Nested List Iterator

Binary Tree Level Order Traversal

Binary Tree Zigzag Level Order Traversal

Merge Intervals

First Missing Positive

Next Permutation

Merge Sorted Array

Merge Two Sorted Lists

Valid Palindrome

Combination Sum

Binary Search Tree Iterator

Longest Increasing Subsequence

Peeking Iterator

Reorganize String

Second Highest Salary

Non-decreasing Array

Sum Root to Leaf Numbers

House Robber II

Add Two Numbers II

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Flip Equivalent Binary Trees

Minimum Window Substring

Maximum Width of Binary Tree

Squares of a Sorted Array

Subtree of Another Tree

Add and Search Word - Data structure design

Reverse Nodes in k-Group

Combination Sum II

Partition to K Equal Sum Subsets

Longest Valid Parentheses

Course Schedule

Partition Equal Subset Sum

Cheapest Flights Within K Stops

Rotting Oranges

Find K Closest Elements

Regular Expression Matching

Implement strStr()

Add Two Numbers

Linked List Cycle II

Find the Duplicate Number

Is Graph Bipartite?

Intersection of Two Linked Lists

Top K Frequent Elements

Perfect Squares

Longest Common Prefix

Validate Binary Search Tree

Remove Duplicates from Sorted List

Swap Nodes in Pairs

K Closest Points to Origin

Remove Duplicates from Sorted Array

Minimum Window Subsequence

Design Skiplist

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