#include<iostream>
#include<cstdio>
#include<cstring>
#include<cctype>
#include<cmath>
#include<vector>
#include<queue>
#include<map>
#include<algorithm>
#include<set>
#define scnaf scanf
#define cahr char
#define bug puts("bugbugbug");
using namespace std;
typedef long long ll;
const int maxn=1e5+15;
int a[100];
int main()
{
    int T_T;
    scanf("%d",&T_T);
    while(T_T--){
        int n;
        scanf("%d",&n);
        for(int i=1;i<=n;i++)
            scanf("%d",&a[i]);
        int ans=n;
        for(int i=n;i>=1;i--)
        if(a[i]==ans)
            ans--;
        printf("%d\n",ans);


    }
}