95pts RE on #1

#include<iostream>
#include<stdio.h>
#define N 100005
using namespace std;
int T;
int n,a[N],ans,maxa,maxb,minb;
void solve()
{
	ans=0;
	maxa=-1;
	cin>>n;
	for(int i=1;i<=n;i++)
		cin>>a[i],maxa=max(maxa,a[i]);
	for(int p=maxa;p<=maxa+1;p++)
	{
		maxb=-1;
		minb=1e9+7;
		for(int i=1;i<=n;i++)
		{
			maxb=max(maxb,a[i]%p);
			minb=min(minb,a[i]%p);
		}
		ans=max(ans,maxb-minb);
	}
	cout<<ans<<"\n";
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	cin>>T;
	while(T--)
		solve();
	return 0;
}