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).

Name		Name	Last commit message	Last commit date
Latest commit History 281 Commits
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
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
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
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
627-swap-salary		627-swap-salary
9-palindrome-number		9-palindrome-number
README.md		README.md

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