找出一個數組裏能把全部數整除的那個數（包含vector的簡單應用）

大意：輸入一個數n,表明這個數組有n個數，找出能把數組中全部數整除的那個數，若果沒有則輸出-1。c++ Ksusha is a beginner coder. Today she starts studying arrays. She has array a1, a2, ..., an, consisting of n positive integers.數組 Her university tea

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