OJ-Problems-Source/HDOJ/5207_autoAC.cpp

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#include<iostream>
#include<cstring>
#include<algorithm>
#define maxn 100000+5
using namespace std;
int mapp[maxn],head[maxn];
int n;
int main()
{
cin.sync_with_stdio(false);
int t,casee=1;
cin>>t;
while(t--)
{
cin>>n;
memset(mapp,0,sizeof(mapp));
memset(head,0,sizeof(head));
int maxx=-1;
for(int i=0;i<n;i++){int x;cin>>x;mapp[x]++;maxx=max(maxx,x);}
for(int i=2;i<=maxx;i++)
{
for(int j=i;j<=maxx;j+=i)
{
if(mapp[j]) head[i]+=mapp[j];
}
}
cout<<"Case #"<<casee++<<": ";
for(int i=maxx;i>=1;i--)
{
if(head[i]>=2) {cout<<i<<endl;break;}
}
}
return 0;
}