题目：

题解：

func candy(ratings []int) int {
    n := len(ratings)
    ans, inc, dec, pre := 1, 1, 0, 1
    for i := 1; i < n; i++ {
        if ratings[i] >= ratings[i-1] {
            dec = 0
            if ratings[i] == ratings[i-1] {
                pre = 1
            } else {
                pre++
            }
            ans += pre
            inc = pre
        } else {
            dec++
            if dec == inc {
                dec++
            }
            ans += dec
            pre = 1
        }
    }
    return ans
}