1. (2021·湖州模拟) 某排序算法的 VB 程序段如下：

n = 8: f = 1: c = 0

For i = 1 To n \ 2 - 1

    For j = 1 To n - 2 * i

        If f * a(j) < f * a(j + 2) Then

            t = a(j): a(j) = a(j + 2): a(j + 2) = t

            c = c + 1

        End If

        f = -f

    Next j

Next i

数组元素a(1)到a(8)的初始值依次为：“16,31,42,38,35,29,27,15”,执行该程序段后，变量C的值为(        )