题解

#include <bits/stdc++.h>
using namespace std;
int n,a[505],cnt;
int main(){
    cin >>n;
    for(int i = 1;i <= n;i++){
        cin >> a[i];
    }
    cnt = __gcd(a[1],a[2]);
    for(int i = 2;i < n;i++){
        cnt = __gcd(cnt,a[i + 1]);
    }
    cout << cnt;
    return 0;
}