Maximize sum(arr[i]*i) of an Array
Basic Accuracy: 38.55% Submissions: 23954 Points: 1

Given an array A of N integers. Your task is to write a program to find the maximum value of ∑arr[i]*i, where i = 0, 1, 2,…., n – 1.
You are allowed to rearrange the elements of the array.
Note: Since output could be large, hence module 109+7 and then print answer.

 

Example 1:

Input : Arr[] = {5, 3, 2, 4, 1}
Output : 40
Explanation:
If we arrange the array as 1 2 3 4 5 then 
we can see that the minimum index will multiply
with minimum number and maximum index will 
multiply with maximum number. 
So 1*0+2*1+3*2+4*3+5*4=0+2+6+12+20 = 40 mod(109+7) = 40

Example 2:

Input : Arr[] = {1, 2, 3}
Output : 8


Your Task:
This is a function problem. The input is already taken care of by the driver code. You only need to complete the function Maximize() that takes an array (arr), sizeOfArray (n), and return the maximum value of an array. The driver code takes care of the printing.

Expected Time Complexity: O(nlog(n)).
Expected Auxiliary Space: O(1).

Constraints:
1 ≤ N ≤ 107
1 ≤ Ai ≤ N

We are replacing the old Disqus forum with the new Discussions section given below.
Click here to view old Disqus comments.


to report an issue on this page.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

Yes

All Submissions

My Submissions:

Login to access your submissions.

Maximize sum(arr[i]*i) of an Array

Output Window