problem_solving problem solving LeetCode Topics Database 0197-rising-temperature 0570-managers-with-at-least-5-direct-reports 0577-employee-bonus 0584-find-customer-referee 0595-big-countries 0596-classes-more-than-5-students 0610-triangle-judgement 0619-biggest-single-number 0620-not-boring-movies 1135-customers-who-bought-all-products 1153-product-sales-analysis-i 1155-product-sales-analysis-iii 1161-project-employees-i 1182-game-play-analysis-iv 1245-user-activity-for-the-past-30-days-i 1258-article-views-i 1292-immediate-food-delivery-ii 1317-monthly-transactions-i 1338-queries-quality-and-percentage 1390-average-selling-price 1415-students-and-examinations 1509-replace-employee-id-with-the-unique-identifier 1724-customer-who-visited-but-did-not-make-any-transactions 1773-percentage-of-users-attended-a-contest 1801-average-time-of-process-per-machine 1827-invalid-tweets 1877-find-followers-count 1882-the-number-of-employees-which-report-to-each-employee 1908-recyclable-and-low-fat-products 1942-primary-department-for-each-employee 2087-confirmation-rate 2495-number-of-unique-subjects-taught-by-each-teacher