์ ์๋ก ๋ฐ ์กฐํฉ๋ก https://www.acmicpc.net/problem/2004 ์คํ https://www.acmicpc.net/problem/10828 https://www.acmicpc.net/problem/10773 https://www.acmicpc.net/problem/9012 https://www.acmicpc.net/problem/4949 https://www.acmicpc.net/problem/1874 ์คํ ์์ด
