HDUJ 1019 Least Common Multiple

Posted 2020-09-14 ljbguanli

Least Common Multiple

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 29480    Accepted Submission(s): 11136

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

#include<stdio.h>
int gcd(int a,int b)
{
	return b==0?
a:gcd(b,a%b);
}
int main()
{
	int n,a,b,i,m;
	scanf("%d",&m);
	while(m--)
	{
		scanf("%d%d",&n,&a);
		for(i=1;i<n;i++)
		{
		    scanf("%d",&b);
		    a=a/gcd(a,b)*b;
		}
		printf("%d\n",a);
	}
	return 0;
}