//```// YF YUSUF
#define YF ios_base::sync_with_stdio(0);cout.setf(ios::fixed);
#define YUSUF cout.precision(0);cout.tie(0);cin.tie(0);
// #include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <cmath>
#include <numeric>
#include <queue>
#include <stack>
#include <cassert>
#include <climits>
#include <string>
#include <cstdlib>
#include <random>
#include <ctime>
using namespace std;
#ifdef YF_CHECK
bool Output=1;
#else
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("O3")
bool Output=0;
#endif
using ll = long long;
using ld = long double;
using sll = set <ll>;
using vll = vector <ll>;
using mll = map <ll,ll>;
using pll = pair <ll,ll>;
using vvl = vector <vll>;
using vpll = vector <pll>;
template<class T>T MIN(T&a,T b){a=min(a,b);return a;}
template<class T>T MAX(T&a,T b){a=max(a,b);return a;}
#define all(a) a.begin(),a.end()
#define sgr v+v+1,(tl+tr)/2+1,tr
#define sgl v+v,tl,(tl+tr)/2
#define pb push_back
#define ins insert
#define S second
#define F first
mt19937_64 MT(time(0));
ll BP(ll a,ll b,ll mod=1e9+7){
if(b==0)return 1;
ll q=BP(a,b/2,mod);
return ((q*q)%mod*(b%2?a:1ll))%mod;
}
ll f(ll x){return x*(x+1)/2;}
ll dup(ll a,ll b){return (a+b-1)/b;}
ll lcm(ll a,ll b){return a/__gcd(a,b)*b;}
ll invf(ll x){return (-1+sqrt(1+8*x))/2;}
const ll mod=998244353;
const ll INF=1e18;
const ll inf=1e9+7;
const ll N =1e6+7;
vll b(N);
ll n;
void MinMax(long long s, long long t, long long *mn, long long *mx)
{
int lo = 1, hi = n, left = n+1, right = 0;
while (lo <= hi){
int mid = (lo+hi)>>1;
if (b[mid] >= s) hi = mid - 1, left = mid;
else lo = mid + 1;
}
lo = 1, hi = n;
while (lo <= hi){
int mid = (lo+hi)>>1;
if (b[mid] <= t) lo = mid + 1, right = mid;
else hi = mid - 1;
}
if (left > right) *mn = *mx = -1;
else{
*mn = b[left];
*mx = b[right];
}
}
set<ll>st;
void dac(ll l,ll r){
if(l > r)return;
ll m = (l+r)/2;
ll x=-1,y,X=-1,Y;
if(l<=m)MinMax(l, m, &x, &y);
if(m+1<=r)MinMax(m+1, r, &X, &Y);
if(x!=-1){
st.ins(x);
st.ins(y);
dac(x+1,y-1);
}
if(X!=-1){
st.ins(X);
st.ins(Y);
dac(X+1, Y-1);
}
}
void YF_MAIN(ll TEST){
st.clear();
cin>>n;
for(int i=1;i<=n;i++)cin>>b[i];
vll a(n+1);
{
ll l = 0ll, r = (1000000000000000000LL);
MinMax(l, r, &a[1], &a[n]);
}
dac(a[1]+1, a[n]-1);
st.ins(a[1]);
st.ins(a[n]);
// return;
ll cnt = 0;
for(auto i : st)a[++cnt] = i;
ll mx = 0;
for(int i=1;i<=n;i++)cout<<b[i]<<" ";cout<<"\n";
for(int i=1;i<=n;i++){
if(i>1)MAX(mx, a[i] - a[i-1]);
cout<<a[i]<<" ";
}
cout<<"\n";
cout<<mx;
}
bool TECT=1;
bool OUTP=1;
ll lg(ll x){return (x ? 63 - __builtin_clzll(x) : -1);}
const ll SN=2e0 + 7; ll SM[SN];
const ll FN=2e0 + 7; ll FACT[FN], inv[FN], FMOD=inf;
ll PER(ll n,ll k){return FACT[n] *inv[n-k]%FMOD;}
ll CNK(ll n,ll k){return PER(n,k)*inv[k ]%FMOD;}
void BEFORE(){
for(ll i=2;i<SN;i++){
if(SM[i])continue;
for(ll j=i;j<SN;j+=i)
MAX(SM[j],i);
}
FACT[0]=inv[0]=1;
for(int i=1;i<FN;i++){
FACT[i]=FACT[i-1]*i%FMOD;
if(i<5e5+7)inv[i]=BP(FACT[i],FMOD-2,FMOD);
}
}
signed main(){
// freopen(("input.txt"),"r",stdin);freopen(("output.txt"),"w",stdout);
if(OUTP){YF YUSUF}
cout<<(0 && Output ? "\nYF_OUTPUT:\n\n" : "");
int TEST=1;
if(TECT)
cin>>TEST;
BEFORE();
for(int T=1;T<=TEST;T++){
// cout<<"Case "<<T<<": ";
YF_MAIN(T);
cout<<(T==TEST ? "" : "\n");
}
return 0;
}
//```
