Given a non-negative integer sequence A with length N, you can exchange two adjacent numbers each time. After K exchanging operations, what’s the minimum reverse number the sequence can achieve?
The reverse number of a sequence is the number of pairs (i, j) such that
i < j and Ai > Aj
There are multiple cases.
For each case, first line contains two numbers: N, K
2<=N<=100000, 0 <= K < 2^60
Second line contains N non-negative numbers, each of which not greater than 2^30
Minimum reverse number you can get after K exchanging operations.