#include<bits/stdc++.h>
using namespace std;
#define int long long
int a[100005]; 
void solve()
{
	int n;
	cin>>n;
	for(int i=0;i<n;++i)
	{
		cin>>a[i];
	}
	int ans=0;
	for(int i=0;i<n-1;++i)
	{
		int k=1,p=0;
		int j=0;
		while(a[i]>0||j>0)
		{
			
			int x=a[i]%10+a[i+1]%10+j;
			a[i]/=10;
			a[i+1]/=10;
			j=x/10;
			if(j>0) ans++;
			p+=k*(x%10);
			k*=10;
		}
		a[i+1]=p;
	}
	cout<<ans<<"\n";
}
signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int t=1;
	cin>>t;
	while(t--) solve();
}