Cobb（数据估计处理）

Cobb（数据估计处理）

You are given n integers a1,a2,…,an and an integer k. Find the maximum value of i⋅j−k⋅(ai|aj) over all pairs (i,j) of integers with 1≤i<j≤n. Here, | is the bitwise OR operator.
Input
The first line contains a single integer t (1≤t≤10000) — the number of test cases.
The first line of each test case contains two integers n (2≤n≤105) and k (1≤k≤min(n,100)).
The second line of each test case contains n integers a1,a2,…,an (0≤ai≤n).
It is guaranteed that the sum of n over all test cases doesn’t exceed 3⋅105.
Output
For each test case, print a single integer — the maximum possible value of i⋅j−k⋅(ai|aj).

#include<bits/stdc++.h>
using nam