#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>>t;
while(t--){
int n;
cin>>n;
int d[n], count = 0;
for(int i=0;i<n;i++){
cin>>d[i];
}
for(int i=1; i<n; i++){
if(d[i]<d[i-1]){
count++;
}
}
cout << count << endl;
}
}
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