package test;

import java.io.*;

import java.util.*;

public class AtCoder3 {

static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

public static int nextInt() throws IOException {

return Integer.parseInt(br.readLine());

}

public static int[] nextArr() throws IOException {

String elements[] = br.readLine().split(" ");

int arr[] = new int[elements.length];

for (int j = 0; j < elements.length; j++)

arr[j] = Integer.parseInt(elements[j]);

return arr;

}

public static void printArr(int arr[]) {

for (int i = 0; i < arr.length; i++)

System.out.print(arr);

}

public static String next() throws IOException {

return br.readLine();

}

public static void main(String[] args) throws IOException {

int T = nextInt();

while (T-- > 0) {

while (T-- > 0) {

int n = nextInt();

int arr[] = nextArr();

for (int i = 0; i < n; i++)

arr[i] = nextInt();

int currmax = 0, max = Integer.MIN_VALUE;

for (int i = 0; i < arr.length; i++) {

currmax += arr[i];

max = Math.max(max, currmax);

if (currmax <= 0)

currmax = 0;

}

System.out.println(max);

}

}

}

}