#include<bits/stdc++.h>
#define pii pair<int,int>
#define x first
#define y second
#define int long long
using namespace std;

const int N=2e5+5;
void slove(){
    int n,s,res=0,ans,tmp;cin>>n;
    cin>>s;
    for(int i=2,x;i<=n;++i){
        cin>>x;
        tmp = ans=s+x;
        bool f1=1,f2=1;
        while(tmp){
            int a=tmp%10,b=s%10,c=x%10,flag=0;
            if(s==0)f1=0;
            if(x==0)f2=0;
            if(f1&&a<b){
                flag=1;
            }
            if(f2&&a<c){
                flag=1;
            }
            if(flag)    ++res;
            tmp/=10,s/=10,x/=10;
        }
        s = ans;
    }
    cout<<res<<"\n";
}

signed main()
{
    ios::sync_with_stdio(0);
    int t;cin>>t;
    while(t--){
        slove();
    }
    return 0;
}