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Repository files navigation

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

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