백준: 6749번 Next in line (Python3)

백준: 6749번 Next in line (Python3) Next in line 성공다국어 시간 제한메모리 제한제출정답맞힌 사람정답 비율 1 초 128 MB 5321 4606 4417 86.898% 문제 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 could be 5, 10 and 15, since.....