找出一个数组里能把全部数整除的那个数（包含vector的简单应用）

大意：输入一个数n,表明这个数组有n个数，找出能把数组中全部数整除的那个数，若果没有则输出-1。c++ Ksusha is a beginner coder. Today she starts studying arrays. She has array a1, a2, ..., an, consisting of n positive integers.数组 Her university tea

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