#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin>>n;
        int a[n];
        for(int i=0;i<n;i++)
        {
            cin>>a[i];
        }
        bool arr[100]={false};
        for(int i=0;i<n;i++)
        {
            if(a[i]==0)
            {
                for(int j=0;j<n;j++)
                arr[j]=0;
            }
            else
            {
                arr[a[i]]=!arr[a[i]];
            }
        }
        int count=0;
        for(int i=0;i<n;i++)
        {
            count=count+arr[i];
        }
        cout<<count;
    }
    return 0;
}

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