for _ in range(int(input())):
n= int(input())
x= list(map(int,input().split()))
count=0
i = 0
while i<n-1:
if x[i]>x[i+1]:
count+= 1
i+= 1
i+= 1
print(count)#include<bits/stdc++.h>
using namespace std;
int main()
{
int t,n,a[100010];
cin>>t;
while(t--)
{
int ans=0;
cin>>n;
for(int i=1;i<=n;i++) cin>>a[i];
for(int i=1;i<n;i++)
{
if(a[i]>a[i+1])
{
ans++;
i++;
}
}
cout<<ans<<endl;
}
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