显示代码纯文本
#include<bits/stdc++.h>
using namespace std;
int h[100005];
int v[100005];
int a[100005];
bool in[100005];
void niu(){
memset(v,0,sizeof v);
memset(in,0,sizeof in);
memset(a,0,sizeof a);
memset(h,0,sizeof h);
int n;
cin>>n;
for(int i=1;i<=n-1;i++){
cin>>h[i];
v[h[i]]++;
}
if(h[n-1]!=1){
cout<<-1<<endl;
return;
}
int x1=0,x2=0;
for(int i=1;i<=n;i++){
if(v[i]==0){
if(x1){
x2=i;
}else{
x1=i;
}
}if(v[i]>1&&i>1||v[i]>2){
cout<<-1<<endl;
return;
}
}
if(x1>x2){
swap(x1,x2);
}
if(x1==0){
x1=1;
}
int l=1,r=n;
a[l]=x1;
a[r]=x2;
in[x1]=in[x2]=1;
int nw=1;
for(int i=1;i<=n-1;i++){
if(r==l+1){
break;
}
if(a[l]<a[r]){
a[r-1]=h[i];
r--;
}else{
a[l+1]=h[i];
l++;
}
}
for(int i=1;i<=n;i++){
cout<<a[i]<<" ";
}
cout<<endl;
}
int main(){
freopen("permutation.in","r",stdin);
freopen("permutation.out","w",stdout);
int t;
cin>>t;
while(t--){
niu();
}
fclose(stdin);
fclose(stdout);
return 0;
}