Algorithm

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• LeetCode

LeetCode Topics

Array

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0049-group-anagrams	Medium
0053-maximum-subarray	Medium
0054-spiral-matrix	Medium
0063-unique-paths-ii	Medium
0079-word-search	Medium
0088-merge-sorted-array	Easy
0200-number-of-islands	Medium
0209-minimum-size-subarray-sum	Medium
0213-house-robber-ii	Medium
0347-top-k-frequent-elements	Medium
0494-target-sum	Medium
0851-loud-and-rich	Medium

Hash Table

Problem Name	Difficulty
0049-group-anagrams	Medium
0146-lru-cache	Medium
0347-top-k-frequent-elements	Medium
0438-find-all-anagrams-in-a-string	Medium

String

Problem Name	Difficulty
0006-zigzag-conversion	Medium
0049-group-anagrams	Medium
0079-word-search	Medium
0438-find-all-anagrams-in-a-string	Medium

Sorting

Problem Name	Difficulty
0049-group-anagrams	Medium
0088-merge-sorted-array	Easy
0347-top-k-frequent-elements	Medium

Divide and Conquer

Problem Name	Difficulty
0053-maximum-subarray	Medium
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
0207-course-schedule	Medium
0337-house-robber-iii	Medium
0802-find-eventual-safe-states	Medium
0851-loud-and-rich	Medium

Breadth-First Search

Problem Name	Difficulty
0200-number-of-islands	Medium
0207-course-schedule	Medium
0802-find-eventual-safe-states	Medium

Union-Find

Problem Name	Difficulty
0200-number-of-islands	Medium

Matrix

Problem Name	Difficulty
0054-spiral-matrix	Medium
0063-unique-paths-ii	Medium
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
0438-find-all-anagrams-in-a-string	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
0184-department-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
0626-exchange-seats	Medium
1174-immediate-food-delivery-ii	Medium
1193-monthly-transactions-i	Medium
1633-percentage-of-users-attended-a-contest	Easy
1934-confirmation-rate	Medium
3475-dna-pattern-recognition	Medium

Backtracking

Problem Name	Difficulty
0079-word-search	Medium
0494-target-sum	Medium

Linked List

Problem Name	Difficulty
0019-remove-nth-node-from-end-of-list	Medium
0021-merge-two-sorted-lists	Easy
0024-swap-nodes-in-pairs	Medium
0146-lru-cache	Medium
0203-remove-linked-list-elements	Easy
0206-reverse-linked-list	Easy

Two Pointers

Problem Name	Difficulty
0019-remove-nth-node-from-end-of-list	Medium
0042-trapping-rain-water	Hard
0088-merge-sorted-array	Easy

Concurrency

Problem Name	Difficulty
1115-print-foobar-alternately	Medium
1226-the-dining-philosophers	Medium

Math

Problem Name	Difficulty
0070-climbing-stairs	Easy
0172-factorial-trailing-zeroes	Medium

Dynamic Programming

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0053-maximum-subarray	Medium
0063-unique-paths-ii	Medium
0070-climbing-stairs	Easy
0213-house-robber-ii	Medium
0337-house-robber-iii	Medium
0494-target-sum	Medium

Memoization

Problem Name	Difficulty
0070-climbing-stairs	Easy

Graph Theory

Problem Name	Difficulty
0207-course-schedule	Medium
0802-find-eventual-safe-states	Medium
0851-loud-and-rich	Medium

Topological Sort

Problem Name	Difficulty
0207-course-schedule	Medium
0802-find-eventual-safe-states	Medium
0851-loud-and-rich	Medium

Stack

Problem Name	Difficulty
0042-trapping-rain-water	Hard

Monotonic Stack

Problem Name	Difficulty
0042-trapping-rain-water	Hard

Simulation

Problem Name	Difficulty
0054-spiral-matrix	Medium

Design

Problem Name	Difficulty
0146-lru-cache	Medium

Doubly-Linked List

Problem Name	Difficulty
0146-lru-cache	Medium

Recursion

Problem Name	Difficulty
0021-merge-two-sorted-lists	Easy
0024-swap-nodes-in-pairs	Medium
0203-remove-linked-list-elements	Easy
0206-reverse-linked-list	Easy

Tree

Problem Name	Difficulty
0337-house-robber-iii	Medium

Binary Tree

Problem Name	Difficulty
0337-house-robber-iii	Medium