hdu1019 Least Common Multiple

Problem Description

The least common multiple (LCM) of a set of positive integers is the smallest positive integer which is divisible by all the numbers in the set. For example, the LCM of 5, 7 and 15 is 105.

 

 

Input

Input will consist of multiple problem instances. The first line of the input will contain a single integer indicating the number of problem instances. Each instance will consist of a single line of the form m n1 n2 n3 ... nm where m is the number of integers in the set and n1 ... nm are the integers. All integers will be positive and lie within the range of a 32-bit integer.

 

 

Output

For each problem instance, output a single line containing the corresponding LCM. All results will lie in the range of a 32-bit integer.

 

 

Sample Input

2

3 5 7 15

6 4 10296 936 1287 792 1

 

 

Sample Output

105

10296

橙子教我的黑科技直接用__gcd求最小公约数

#include<iostream>
#include<algorithm> 
using namespace std;
int main()
{
    int n;
    int sum,m,a;
    scanf("%d",&n);
    while(n--)
    {
        scanf("%d",&m);
             sum=1;
        while(m--)
        {
            scanf("%d",&a);
            sum=sum/__gcd(sum,a)*a;
        }
        printf("%d\n",sum);
    }
    return 0;
}