Algorithm

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• LeetCode

LeetCode Topics

Array

Problem Name	Difficulty
0049-group-anagrams	Medium
0079-word-search	Medium
0200-number-of-islands	Medium
0209-minimum-size-subarray-sum	Medium
0347-top-k-frequent-elements	Medium

Hash Table

Problem Name	Difficulty
0049-group-anagrams	Medium
0347-top-k-frequent-elements	Medium

String

Problem Name	Difficulty
0049-group-anagrams	Medium
0079-word-search	Medium

Sorting

Problem Name	Difficulty
0049-group-anagrams	Medium
0347-top-k-frequent-elements	Medium

Divide and Conquer

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Heap (Priority Queue)

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Bucket Sort

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Counting

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Quickselect

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Depth-First Search

Problem Name	Difficulty
0079-word-search	Medium
0200-number-of-islands	Medium

Breadth-First Search

Problem Name	Difficulty
0200-number-of-islands	Medium

Union-Find

Problem Name	Difficulty
0200-number-of-islands	Medium

Matrix

Problem Name	Difficulty
0079-word-search	Medium
0200-number-of-islands	Medium

Binary Search

Problem Name	Difficulty
0209-minimum-size-subarray-sum	Medium

Sliding Window

Problem Name	Difficulty
0209-minimum-size-subarray-sum	Medium

Prefix Sum

Problem Name	Difficulty
0209-minimum-size-subarray-sum	Medium

Database

Problem Name	Difficulty
0176-second-highest-salary	Medium
0177-nth-highest-salary	Medium
0196-delete-duplicate-emails	Easy
0570-managers-with-at-least-5-direct-reports	Medium
0577-employee-bonus	Easy
0584-find-customer-referee	Easy

Backtracking

Problem Name	Difficulty
0079-word-search	Medium

Linked List

Problem Name	Difficulty
0019-remove-nth-node-from-end-of-list	Medium

Two Pointers

Problem Name	Difficulty
0019-remove-nth-node-from-end-of-list	Medium

Concurrency

Problem Name	Difficulty
1115-print-foobar-alternately	Medium

Math

Problem Name	Difficulty
0070-climbing-stairs	Easy

Dynamic Programming

Problem Name	Difficulty
0070-climbing-stairs	Easy

Memoization

Problem Name	Difficulty
0070-climbing-stairs	Easy