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1301B.cpp
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1301B.cpp
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#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define vt vector
#define ll long long
#define pb push_back
#define ioa insert_or_assign
#define umap unordered_map
#define prq priority_queue
#define F first
#define S second
#define all(c) (c).begin(), (c).end()
#define rev(c) (c).rbegin(), (c).rend()
#define sz(x) (int)(x).size()
#define mset(ar, val) memset(ar, val, sizeof(ar))
#define en '\n'
const int d4r[4] = {-1,0,1,0}; const int d4c[4] = {0,1,0,-1};
const int d8r[8] = {-1,-1,0,1,1,1,0,-1}; const int d8c[8] = {0,1,1,1,0,-1,-1,-1};
const int INF = 0x3f3f3f3f; const int mINF = 0xc0c0c0c0;
const ll LINF = 0x3f3f3f3f3f3f3f3f; const ll mLINF = 0xc0c0c0c0c0c0c0c0;
int T = 1;
void sol() {
int n;
cin >> n;
vt<int> a(n);
for(int &x : a) cin >> x;
vt<int> v; // non-missing values
int mn = INF, mx = mINF;
for(int i=0; i<n; ++i) {
if(i > 0 && a[i] == -1 && a[i-1] != -1) {
mn = min(mn, a[i-1]);
mx = max(mx, a[i-1]);
}
if(i < n-1 && a[i] == -1 && a[i+1] != -1) {
mn = min(mn, a[i+1]);
mx = max(mx, a[i+1]);
}
}
int k = (mn + mx) / 2;
int ans = mINF;
for(int i=0; i<n; ++i) {
if(a[i] == -1) a[i] = k;
if(i) ans = max(ans, abs(a[i] - a[i-1]));
}
cout << ans << ' ' << k << en;
return;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> T;
while(T--) {
sol();
}
return 0;
}