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The BytePlus platform has n servers, where the data stored on the ith server is represented by the array memory. To manage the server efficiently you can perform the following operation any (possibly zero) number of times: • Choose an index idx, such that 1 ≤ idx s n/2. • Swap the data of the pair of servers that are equidistant from the beginning and the ending of the array memory and have a distance less than or equal to idx. The total working efficiency of the servers is calculated as the sum of the product of the data present in each server with the index of that server. Given an integer n, and an array emory, find the maximum possible total working efficiency that we can get, since the total working efficiency can be very large print it modulo 109+7.
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Machine Learning Engineer Intern

Interviewed at TikTok

3.2★
Dec 10, 2023

The BytePlus platform has n servers, where the data stored on the ith server is represented by the array memory. To manage the server efficiently you can perform the following operation any (possibly zero) number of times: • Choose an index idx, such that 1 ≤ idx s n/2. • Swap the data of the pair of servers that are equidistant from the beginning and the ending of the array memory and have a distance less than or equal to idx. The total working efficiency of the servers is calculated as the sum of the product of the data present in each server with the index of that server. Given an integer n, and an array emory, find the maximum possible total working efficiency that we can get, since the total working efficiency can be very large print it modulo 109+7.

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