백준3977 축구전술 - https://www.acmicpc.net/problem/3977 더보기 https://thinkmath2020.tistory.com/3378 백준 4196 도미노 - https://www.acmicpc.net/problem/4196 더보기 https://thinkmath2020.tistory.com/3377 백준 4013 ATM - https://www.acmicpc.net/problem/4013 더보기 https://thinkmath2020.tistory.com/3380