HDU1019
Least Common Multiple
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 45020 Accepted Submission(s): 16916
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
Source
East Central North America 2003, Practice
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题意:
水题。求几个数的最小公倍数。
思路:辗转相除法,输入一个数算一次。
AC代码:
#include<iostream>
using namespace std;
int main()
{
int t,n;
long long a;
cin>>t;
while(t--)
{
cin>>n;
long long m=1;
for(int i=1;i<=n;++i)
{
cin>>a;
long long b=m,c=a;
if(c>b)
{
long long tmp=b;
b=c;
c=tmp;
}
while(b%c!=0)
{
long long d=b%c;
if(d>c)
{
b=d;
}
else
{
b=c;
c=d;;
}
}
m=m*a/c;
}
cout<<m<<endl;
}
return 0;
}
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