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- Week 4
- The Maximum Subarray

# The Maximum Subarray

# The Maximum Subarray

- Prepare
- Interview Preparation Kits
- 1 Month Preparation Kit
- Week 4
- The Maximum Subarray

We define *subsequence* as any subset of an array. We define a *subarray* as a *contiguous subsequence* in an array.

Given an array, find the maximum possible sum among:

- all nonempty subarrays.
- all nonempty subsequences.

Print the two values as space-separated integers on one line.

**Note** that empty subarrays/subsequences should not be considered.

**Example**

The maximum subarray sum is comprised of elements at inidices . Their sum is . The maximum subsequence sum is comprised of elements at indices and their sum is .

**Function Description**

Complete the *maxSubarray* function in the editor below.

maxSubarray has the following parameter(s):

*int arr[n]:*an array of integers

**Returns**

*int[2]:*the maximum subarray and subsequence sums

**Input Format**

The first line of input contains a single integer , the number of test cases.

The first line of each test case contains a single integer .

The second line contains space-separated integers where .

**Constraints**

*The subarray and subsequences you consider should have at least one element.*

**Sample Input**

```
2
4
1 2 3 4
6
2 -1 2 3 4 -5
```

**Sample Output**

```
10 10
10 11
```

**Explanation**

In the first case:

The max sum for both contiguous and non-contiguous elements is the sum of ALL the elements (as they are all positive).

In the second case:

[2 -1 2 3 4] --> This forms the contiguous sub-array with the maximum sum.

For the max sum of a not-necessarily-contiguous group of elements, simply add all the positive elements.