题目连接

题面：

代码：

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<string>
#include<cmath>
#include<queue>
#include<map>
#include<ctime>
#include<vector>
#define ll long long
#define llu unsigned ll
using namespace std;
int gcd(int a,int b)
{
    if(b==0) return a;
    return gcd(b,a%b);
}

int main(void)
{
    int n,ans=0,x;
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&x);
        ans=gcd(ans,abs(x));
    }
    printf("%d\n",ans);
    return 0;
}