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#include<bits/stdc++.h>

using namespace std;

int main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tt;
	cin >> tt;
	while(tt--){
    int n;
    cin >> n;
    long long ans = 0;
    for (int i = 0; i < n; i++) {
      int x;
      cin >> x;
      ans += x;
    }
    cout << abs(ans) << '\n';
	}
}