// arrays/ParallelPrefix3.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// {ExcludeFromTravisCI}

import java.util.*;

public class ParallelPrefix3 {

static final int SIZE = 10_000_000;

public static void main(String[] args) {

long[] nums = new long[SIZE];

Arrays.setAll(nums, n -> n);

Arrays.parallelPrefix(nums, Long::sum);

System.out.println("First 20: " + nums[19]);

System.out.println("First 200: " + nums[199]);

System.out.println("All: " + nums[nums.length-1]);

}

}

/* Output:

First 20: 190

First 200: 19900

All: 49999995000000

*/