#include <iostream>
using namespace std;
int main() {
// your code goes here
int t; cin>>t;
while(t--)
{
int n,b=0; cin>>n;
int arr[n];
for(int i=0;i<n;i++)
cin>>arr[n];
for(int i=0;i<n;i++)
{
int a=0;
while(arr[i]!=0)
{
a++;
i++;
}
if(a>b)
b=a;
i++;
}
cout<<b<<endl;
}
return 0;
}
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