codeforce - alternating subsequence

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fast()(ios_base::sync_with_stdio(0),cin.tie(NULL));
int main()
{
    fast();
    ll t;
    cin>>t;
    while(t--)
    {
        ll n;
        cin>>n;
        ll ara[n+1],sum=0;
        for(ll i=0;i<n;i++)cin>>ara[i];
        ll mx=ara[0];
        bool f;
        if(mx>0)f=true;
        else f=false;
        for(ll i=0;i<n;i++)
        {
            if(ara[i]>0 && f)
            {

                mx=max(mx,ara[i]);
            }
            else if(ara[i]>0 && !f)
            {
                sum+=mx;
                mx=ara[i];
                f=true;
            }
            else if(ara[i]<0 && !f)
            {
                mx=max(mx,ara[i]);
            }
            else if(ara[i]<0 && f)
            {
                sum+=mx;
                mx=ara[i];
                f=false;
            }
            //cout<<"sum "<<sum<<endl;
        }
        sum+=mx;
        cout<<sum<<endl;

        //cout<<max(-1,-5)<<endl;
    }
}