Leetcode challenges

In this repository I save all my solutions to leetcode challenges As of April 2025 I am going through:

SQL50 (finished on May 23 2025)
30 Days of JavaScript

Why am I doing this?

I started out learning web development in 2020 and just recently (2024) got a taste of data analysis and data wrangling that caused a web dev hiatus. To get back into JS and improve my problem solving skills, I decided to work on SQL and JS problems in parallel. Given that I find data analysis quite engaging, there are plans to aquire Python skills for the remainder of the year (2025).

LeetCode Topics

Database


0176-second-highest-salary
0184-department-highest-salary
0608-tree-node
1268-market-analysis-i
1523-capital-gainloss
3767-find-students-who-improved

Name		Name	Last commit message	Last commit date
0176-second-highest-salary		0176-second-highest-salary
0184-department-highest-salary		0184-department-highest-salary
0608-tree-node		0608-tree-node
1-two-sum		1-two-sum
1135-customers-who-bought-all-products		1135-customers-who-bought-all-products
1136-actors-and-directors-who-cooperated-at-least-three-times		1136-actors-and-directors-who-cooperated-at-least-three-times
1153-product-sales-analysis-i		1153-product-sales-analysis-i
1155-product-sales-analysis-iii		1155-product-sales-analysis-iii
1161-project-employees-i		1161-project-employees-i
1174-sales-analysis-iii		1174-sales-analysis-iii
1179-game-play-analysis-i		1179-game-play-analysis-i
1182-game-play-analysis-iv		1182-game-play-analysis-iv
1245-user-activity-for-the-past-30-days-i		1245-user-activity-for-the-past-30-days-i
1258-article-views-i		1258-article-views-i
1268-market-analysis-i		1268-market-analysis-i
1278-product-price-at-a-given-date		1278-product-price-at-a-given-date
1292-immediate-food-delivery-ii		1292-immediate-food-delivery-ii
13-roman-to-integer		13-roman-to-integer
1301-reformat-department-table		1301-reformat-department-table
1317-monthly-transactions-i		1317-monthly-transactions-i
1327-last-person-to-fit-in-the-bus		1327-last-person-to-fit-in-the-bus
1338-queries-quality-and-percentage		1338-queries-quality-and-percentage
1390-average-selling-price		1390-average-selling-price
1415-students-and-examinations		1415-students-and-examinations
1452-restaurant-growth		1452-restaurant-growth
1462-list-the-products-ordered-in-a-period		1462-list-the-products-ordered-in-a-period
1480-movie-rating		1480-movie-rating
1509-replace-employee-id-with-the-unique-identifier		1509-replace-employee-id-with-the-unique-identifier
1523-capital-gainloss		1523-capital-gainloss
1541-top-travellers		1541-top-travellers
1625-group-sold-products-by-the-date		1625-group-sold-products-by-the-date
1664-find-users-with-valid-e-mails		1664-find-users-with-valid-e-mails
1670-patients-with-a-condition		1670-patients-with-a-condition
1724-customer-who-visited-but-did-not-make-any-transactions		1724-customer-who-visited-but-did-not-make-any-transactions
1734-bank-account-summary-ii		1734-bank-account-summary-ii
175-combine-two-tables		175-combine-two-tables
176-second-highest-salary		176-second-highest-salary
1773-percentage-of-users-attended-a-contest		1773-percentage-of-users-attended-a-contest
180-consecutive-numbers		180-consecutive-numbers
1801-average-time-of-process-per-machine		1801-average-time-of-process-per-machine
181-employees-earning-more-than-their-managers		181-employees-earning-more-than-their-managers
1811-fix-names-in-a-table		1811-fix-names-in-a-table
182-duplicate-emails		182-duplicate-emails
1827-invalid-tweets		1827-invalid-tweets
183-customers-who-never-order		183-customers-who-never-order
1837-daily-leads-and-partners		1837-daily-leads-and-partners
185-department-top-three-salaries		185-department-top-three-salaries
1877-find-followers-count		1877-find-followers-count
1882-the-number-of-employees-which-report-to-each-employee		1882-the-number-of-employees-which-report-to-each-employee
1892-find-total-time-spent-by-each-employee		1892-find-total-time-spent-by-each-employee
1908-recyclable-and-low-fat-products		1908-recyclable-and-low-fat-products
1942-primary-department-for-each-employee		1942-primary-department-for-each-employee
1948-rearrange-products-table		1948-rearrange-products-table
196-delete-duplicate-emails		196-delete-duplicate-emails
197-rising-temperature		197-rising-temperature
2024-calculate-special-bonus		2024-calculate-special-bonus
2041-the-latest-login-in-2020		2041-the-latest-login-in-2020
2087-confirmation-rate		2087-confirmation-rate
2110-employees-with-missing-information		2110-employees-with-missing-information
2127-employees-whose-manager-left-the-company		2127-employees-whose-manager-left-the-company
2495-number-of-unique-subjects-taught-by-each-teacher		2495-number-of-unique-subjects-taught-by-each-teacher
2731-memoize		2731-memoize
2732-counter		2732-counter
2733-sleep		2733-sleep
2734-array-prototype-last		2734-array-prototype-last
2741-function-composition		2741-function-composition
2742-group-by		2742-group-by
2746-filter-elements-from-array		2746-filter-elements-from-array
2747-apply-transform-over-each-element-in-array		2747-apply-transform-over-each-element-in-array
2759-flatten-deeply-nested-array		2759-flatten-deeply-nested-array
2761-array-reduce-transformation		2761-array-reduce-transformation
2789-counter-ii		2789-counter-ii
2796-allow-one-function-call		2796-allow-one-function-call
2798-chunk-array		2798-chunk-array
2805-array-wrapper		2805-array-wrapper
2809-create-hello-world-function		2809-create-hello-world-function
2813-to-be-or-not-to-be		2813-to-be-or-not-to-be
2820-return-length-of-arguments-passed		2820-return-length-of-arguments-passed
2821-timeout-cancellation		2821-timeout-cancellation
2858-join-two-arrays-by-id		2858-join-two-arrays-by-id
2859-add-two-promises		2859-add-two-promises
2860-sort-by		2860-sort-by
2862-interval-cancellation		2862-interval-cancellation
2863-calculator-with-method-chaining		2863-calculator-with-method-chaining
2864-is-object-empty		2864-is-object-empty
3767-find-students-who-improved		3767-find-students-who-improved
3782-find-valid-emails		3782-find-valid-emails
570-managers-with-at-least-5-direct-reports		570-managers-with-at-least-5-direct-reports
577-employee-bonus		577-employee-bonus
584-find-customer-referee		584-find-customer-referee
585-investments-in-2016		585-investments-in-2016
586-customer-placing-the-largest-number-of-orders		586-customer-placing-the-largest-number-of-orders
595-big-countries		595-big-countries
596-classes-more-than-5-students		596-classes-more-than-5-students
602-friend-requests-ii-who-has-the-most-friends		602-friend-requests-ii-who-has-the-most-friends
607-sales-person		607-sales-person
610-triangle-judgement		610-triangle-judgement
619-biggest-single-number		619-biggest-single-number
620-not-boring-movies		620-not-boring-movies
626-exchange-seats		626-exchange-seats

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