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B.cpp
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B.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define loop(i,a,b) for(ll i=a;i<b;i++)
#define testcases ll t;cin>>t;while(t--)
#define pb push_back
#define all(x) x.begin(), x.end()
#define dec(x) greater<x>()
int main()
{
#ifndef ONLINE_JUDGE
freopen("C:/Users/91731/Documents/input.txt","r",stdin);
freopen("C:/Users/91731/Documents/output.txt","w",stdout);
freopen("C:/Users/91731/Documents/error.txt","w",stderr);
#endif
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
testcases
{
ll n;cin>>n;
ll a[n],minn=INT_MAX,maxn=-1;
loop(i,0,n)cin>>a[i];
loop(i,0,n)
{
if(a[i]!=-1 && (i && a[i-1]==-1 || i+1<n && a[i+1]==-1))
{
minn=min(minn,a[i]);
maxn=max(maxn,a[i]);
}
}
ll k,ans=0;
if(maxn==-1)k=0;
else
k=(minn+maxn)/2;
loop(i,0,n)
if(a[i]==-1)
a[i]=k;
loop(i,1,n)
{
ll z=abs(a[i]-a[i-1]);
ans=max(z,ans);
}
cout<<ans<<" "<<k<<endl;
}
}