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Problems tagged as asked at Meta, grouped by pattern.

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Array

Plus OneStart here

Merge Sorted Array

Best Time to Buy and Sell Stock

Next Permutation

Remove Duplicates from Sorted Array II

Longest Consecutive Sequence

Product of Array Except Self

Hash Table

Top K Frequent Elements

Dot Product of Two Sparse Vectors

Two Pointers

Valid Palindrome

Container With Most Water

Trapping Rain Water

Sliding Window

Longest Substring Without Repeating Characters

Minimum Size Subarray Sum

Permutation in String

Max Consecutive Ones III

Minimum Window Substring

Sliding Window Maximum

Stack

Valid Parentheses

Basic Calculator II

Daily Temperatures

Minimum Remove to Make Valid Parentheses

Basic Calculator

String

Valid Word Abbreviation

Palindromic Substrings

Binary Search

Search in Rotated Sorted Array

Find Peak Element

Koko Eating Bananas

Capacity to Ship Packages Within D Days

Linked List

Intersection of Two Linked Lists

Reverse Linked List

Palindrome Linked List

Add Two Numbers

Remove Nth Node From End of List

Reverse Linked List II

Copy List with Random Pointer

Merge k Sorted Lists

Reverse Nodes in k-Group

Tree

Invert Binary Tree

Diameter of Binary Tree

Subtree of Another Tree

Average of Levels in Binary Tree

Validate Binary Search Tree

Populating Next Right Pointers in Each Node

Populating Next Right Pointers in Each Node II

Sum Root to Leaf Numbers

Binary Tree Right Side View

Kth Smallest Element in a BST

Lowest Common Ancestor of a Binary Tree

All Nodes Distance K in Binary Tree

Binary Tree Maximum Path Sum

Serialize and Deserialize Binary Tree

Graph

Number of Islands

Course Schedule

Course Schedule II

Graph Valid Tree

Number of Connected Components in an Undirected Graph

Evaluate Division

Cheapest Flights Within K Stops

Alien Dictionary

Reconstruct Itinerary

BFS

Walls and Gates

Rotting Oranges

Heap

Kth Largest Element in a Stream

Kth Largest Element in an Array

Top K Frequent Words

K Closest Points to Origin

Find Median from Data Stream

Dynamic Programming

Partition Equal Subset Sum

Regular Expression Matching

Longest Increasing Path in a Matrix

Maximum Profit in Job Scheduling

Greedy

Valid Parenthesis String

Partition Labels

Intervals

Merge Intervals

Insert Interval

Meeting Rooms II

Employee Free Time

Backtracking

Letter Combinations of a Phone Number

Generate Parentheses

Palindrome Partitioning

Matrix

Pacific Atlantic Water Flow

Max Area of Island

Math

Roman to Integer

Integer to English Words

Prefix Sum

Subarray Sum Equals K

Design

Binary Search Tree Iterator

Implement Trie (Prefix Tree)

Design Add and Search Words Data Structure

Insert Delete GetRandom O(1)

Time Based Key-Value Store

BST

Two Sum IV - Input is a BST

Lowest Common Ancestor of a Binary Search Tree

Sorting

Trie