Arithmetic Progressions链接:https://ac.nowcoder.com/acm/contest/7831/B来源:牛客网 题目描述 An arithmetic progression is a sequence of numbers a1, a2, ..., ak where the difference of consecutive members ai+1−ai is a constant (1 ≤ i ≤ k−1). For example, the sequence 5, 8, 11, 14, 17 is an arithmetic progression o...