P1800C2

#include <bits/stdc++.h>
using namespace std;
#define ll long long
void solve()
{
    ll n;
    cin>>n;
    ll k=0;
    multiset <ll> s;
    s.insert(0);
    for (ll i=1; i<=n; i++){
        ll x;
        cin>>x;
        if (x!=0) s.insert(x);
        else {
            auto it=s.end(); it--;
            k+=(*it);
            s.erase(s.find(*it));
        }
    }
    cout<<k<<"\n";
}
int main()
{
    int t;
    cin>>t;
    while(t--){
        solve();
    }
}