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A.cpp
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A.cpp
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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
fastio;
int t,n,i,ara[3000],mn,mx;
cin>>t;
while(t--)
{
cin>>n;
mx=-1;
mn=10000;
int mx2=-1;
vector<int> idx,idx2;
for(i=0;i<n;i++){
cin>>ara[i];
mx=max(mx,ara[i]);
mn=min(mn,ara[i]);
}
for(i=0;i<n;i++)
{
if(ara[i]==mx)
idx.push_back(i);
if(ara[i]==mn)
idx2.push_back(i);
}
for(i=0;i<n;i++)
{
mx2=max(mx2,max(ara[i]-ara[0],ara[i]-ara[(i+1)%n]));
}
for(i=0;i<n;i++)
{
mx2=max(mx2,max(ara[n-1]-ara[i],ara[(i+n-1)%n]-ara[i]));
}
cout<<mx2<<"\n";
}
return 0;
}