Leetcode practice

LeetCode Topics

Hash Table

Problem Name	Difficulty
0169-majority-element	Easy
0229-majority-element-ii	Medium
0387-first-unique-character-in-a-string	Easy
0560-subarray-sum-equals-k	Medium

String

Problem Name	Difficulty
0387-first-unique-character-in-a-string	Easy

Queue

Problem Name	Difficulty
0387-first-unique-character-in-a-string	Easy

Counting

Problem Name	Difficulty
0169-majority-element	Easy
0229-majority-element-ii	Medium
0387-first-unique-character-in-a-string	Easy

Array

Problem Name	Difficulty
0053-maximum-subarray	Medium
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium
0169-majority-element	Easy
0189-rotate-array	Medium
0229-majority-element-ii	Medium
0287-find-the-duplicate-number	Medium
0560-subarray-sum-equals-k	Medium

Divide and Conquer

Problem Name	Difficulty
0053-maximum-subarray	Medium
0169-majority-element	Easy

Dynamic Programming

Problem Name	Difficulty
0053-maximum-subarray	Medium
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium

Greedy

Problem Name	Difficulty
0122-best-time-to-buy-and-sell-stock-ii	Medium

Two Pointers

Problem Name	Difficulty
0189-rotate-array	Medium
0287-find-the-duplicate-number	Medium

Binary Search

Problem Name	Difficulty
0287-find-the-duplicate-number	Medium

Bit Manipulation

Problem Name	Difficulty
0287-find-the-duplicate-number	Medium

Sorting

Problem Name	Difficulty
0169-majority-element	Easy
0229-majority-element-ii	Medium

Math

Problem Name	Difficulty
0189-rotate-array	Medium

Database

Problem Name	Difficulty
0175-combine-two-tables	Easy
0176-second-highest-salary	Medium
0177-nth-highest-salary	Medium
0178-rank-scores	Medium
0182-duplicate-emails	Easy
0183-customers-who-never-order	Easy
0184-department-highest-salary	Medium
0196-delete-duplicate-emails	Easy
0197-rising-temperature	Easy
0584-find-customer-referee	Easy
0595-big-countries	Easy
0596-classes-with-at-least-5-students	Easy
0607-sales-person	Easy
0620-not-boring-movies	Easy
0626-exchange-seats	Medium
1045-customers-who-bought-all-products	Medium
1050-actors-and-directors-who-cooperated-at-least-three-times	Easy
1068-product-sales-analysis-i	Easy
1070-product-sales-analysis-iii	Medium
1148-article-views-i	Easy
1174-immediate-food-delivery-ii	Medium
1193-monthly-transactions-i	Medium
1251-average-selling-price	Easy
1378-replace-employee-id-with-the-unique-identifier	Easy
1683-invalid-tweets	Easy
1757-recyclable-and-low-fat-products	Easy

Prefix Sum

Problem Name	Difficulty
0560-subarray-sum-equals-k	Medium

Linked List

Problem Name	Difficulty
0206-reverse-linked-list	Easy

Recursion

Problem Name	Difficulty
0206-reverse-linked-list	Easy