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E.cpp
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E.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
long long ara[200005];
int main()
{
fastio;
long long t,n,i,mn,idx,p;
cin>>t;
while(t--)
{
cin>>n;
for(i=0;i<n;i++)
{
cin>>ara[i];
if(i==0){
mn=ara[i];
idx=0;
}
else if(ara[i]<mn){
mn=min(mn,ara[i]);
idx=i;
}
}
p=0;
for(i=idx+1;i<n-1;i++)
{
if(ara[i]>ara[i+1])
{
p=1;
break;
}
}
if(p==1)
cout<<-1<<"\n";
else
cout<<idx<<"\n";
}
}