For a finite sequence of non-zero numbers, the number of variations in sign is defined as the number of pairs of consecutive term of the sequence for which the product of consecutive terms is negative, what is the maximum number of variations in sign in the 1. -3, 2, 5, -4 .-6
对于有限非零数列，the number of variations in sign 被定义为数列中一对连续数字（根据排列顺序，非大小顺序）的乘积为负的数量，问你下面数列里the number是多少 | 
