#include <bits/stdc++.h>
#define endl '\n'
#define F first
#define S second
using namespace std;
#define ll long long
#define pb push_back
#define mod 1000000007
#define int long long
#define all(x)      x.begin(),x.end()
#define allr(x)     x.rbegin(),x.rend()
#define CheckBit(x,k)   (x & (1LL << k))
#define SetBit(x,k)     (x |= (1LL << k))
#define ClearBit(x,k)   (x &= ~(1LL << k))
#define toggleBit(x,k)  (x ^= (1LL << k))
#define LSB(mask)       __builtin_ctzll(mask)
#define MSB(mask)       63-__builtin_clzll(mask) 
#define print(x)    cout << #x << " : " << x << endl
#define error1(x)   cerr << #x << " = " << (x) <<endl
#define coutall(v)  for(auto &it: v) cout<<it<<' '; cout<<endl
#define Abid_52     ios::sync_with_stdio(false);cin.tie(0),cin.tie(0)
#define error2(a,b) cerr<<"( "<<#a<<" , "<<#b<<" ) = ( "<<(a)<<" , "<<(b)<<" )\n"
#define UNIQUE(x)   sort(all(x)), x.erase(unique(all(x)), x.end()), x.shrink_to_fit()
template <typename T, typename U> T ceil(T x, U y) {return (x > 0 ? (x + y - 1) / y : x / y);}
template <typename T, typename U> T floor(T x, U y) {return (x > 0 ? x / y : (x - y + 1) / y);}

const int N = 2e5 + 10;

void solve()
{
    int n, m;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++)
    {
        cin >> v[i];
    }

    sort(allr(v));

    ll tot = 0, mx = -1e17;
    tot += v[0];
    tot -= v[1];
    mx = max(tot, mx);
    int i = 2;
    vector<int>ans;
    if(n == 2)
    {
        cout << mx << endl;
        return;
    }
    while(i < n)
    {
        if(v[i] <= 0)
        {
            if(i % 2 == 0)
            {
                ans.push_back(tot);
            }
            break;
        }
        if(i % 2 == 0)
        {
            tot += v[i];
            // mx = max(mx, tot);
            ans.push_back(tot);
        }
        else{
            tot -= v[i];
            // mx = max(mx, tot);
        }
        i++;
    }
    if(n % 2 == 0)
    {
        ans.push_back(tot);
    }
    if(ans.empty())
    {
        cout << mx << endl;
        return;
    }


    cout << *min_element(all(ans)) << endl;
}

int32_t main()
{
    Abid_52;
    int t = 1;
    cin >> t;
    for (int tc = 1; tc <= t; ++tc)
    {
        // cout << "Case " << tc << ": ";
        solve();
    }
}