/* -*- coding: utf-8 -*-
 *
 * 3185.cc:  No.3185 Three Abs - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

using ll = long long;

/* global variables */

int as[MAX_N];
ll ass[MAX_N + 1];

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) scanf("%d", as + i);

    for (int i = 0; i < n; i++) ass[i + 1] = ass[i] + as[i];

    ll maxsc = ass[n], mins = 0, maxs = 0;

    for (int i = 1; i <= n; i++) {
      ll sc0 = abs(mins) + abs(ass[i] - mins) + abs(ass[n] - ass[i]);
      ll sc1 = abs(maxs) + abs(ass[i] - maxs) + abs(ass[n] - ass[i]);
      maxsc = max(maxsc, max(sc0, sc1));

      mins = min(mins, ass[i]);
      maxs = max(maxs, ass[i]);
    }

    printf("%lld\n", maxsc);
  }

  return 0;
}