for _ in range(int(input())):
n,l=int(input()),list(map(int,input().split()))[::-1]
k=True
s=False
for i in range(n-1):
if k==True:
if l[i]>l[i+1]:
k=False
else:
if l[i]<l[i+1]:
s=True
break
if s==True:
print(n-i-1)
else:
print(0)
#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin >> t;
while (t--) {
int n;
cin >> n;
vector<int> a(n);
for (auto &it : a) cin >> it;
int pos = n - 1;
while (pos > 0 && a[pos - 1] >= a[pos]) --pos;
while (pos > 0 && a[pos - 1] <= a[pos]) --pos;
cout << pos << endl;
}
return 0;
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