This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define fi first
#define se second
using namespace std;
vector<int>v,vv;int n;
vector<pair<int,int>>w;
int main()
{
int t;cin>>t;
while(t--)
{
cin>>n;v.clear();vv.clear();
for(int i=0;i<n/2;i++)
{
int x;cin>>x;
v.pb(x);
}
for(int i=0;i<n/2;i++)
{
int x;cin>>x;
x-=n/2;
vv.pb(x);
}int re=1;
for(int i=0;i<n/2;i++)
{
if(v[i]!=vv[i])re=0;
}
if(re==0)
{
cout<<-1<<endl;continue;
}
re=0;
for(int i=0;i<n;i++)
{
for(int j=i+1;j<n;j++)
{
if(v[i]==j+1)
{
re++;
w.pb({i+1,j+1});
swap(v[i],v[j]);
}
}
}
cout<<re<<" "<<re<<endl;
for(auto it:w)cout<<it.fi<<" "<<it.se<<endl;
w.clear();
}
}
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