링크 www.acmicpc.net/problem/6749 6749번: Next in line You know a family with three children. Their ages form an arithmetic sequence: the difference in ages between the middle child and youngest child is the same as the difference in ages between the oldest child and the middle child. For example, their ages c www.acmicpc.net 풀이 첫 줄에 막내의 나이가, 두번 째 줄에 둘째의 나이가 주어진다. 세 명의 아이의 나이가 등차수열이라는 것을 이용하여 첫째의 나..
