- 백준 : https://www.acmicpc.net/step
- leetcode : https://leetcode.com/problemset/
- hackerrank : https://www.hackerrank.com/interview/preparation-kits/one-week-preparation-kit/one-week-day-one/challenges
- codility : https://app.codility.com/programmers/?_gl=1*cbim*_gcl_au*MTY2Nzk2MDM3MS4xNzU0MTQ2NzA4*_ga*NTY3MjcwOTc1LjE3NTQxNDY3MDk.*_ga_SY977F6KE3*czE3NTQxNDY3MDgkbzEkZzAkdDE3NTQxNDY3MDgkajYwJGwwJGgw
Developer