sales_by_match.py
problem link https://www.hackerrank.com/challenges/sock-merchant/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/sock-merchant/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/bon-appetit/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/day-of-the-programmer/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/migratory-birds/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/divisible-sum-pairs/problem?isFullScreen=false
problem link https://www.hackerrank.com/challenges/the-birthday-bar/problem?isFullScreen=true
데이터베이스에 대한 기초 공부 - 비용
hacker_rank problem link https://www.hackerrank.com/challenges/breaking-best-and-worst-records/problem?isFullScreen=false