杭电ACM1019求最大公约数

#include<iostream>using namespace std;int main(){int gcd(int a,int b);int n,m,a;cin>>n;while(n--){        cin>>m;        cin>>a;        m--;        while (m--)        {   int b;            cin>>b;            int k=gcd(a,b);            a=b/k*a;        }        cout<<a<<endl;}return 0;}int gcd(int a,int b){    int r=1;    while (r>0)    {        r=a%b;        a=b;        b=r;    }    return a;}