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// @Title: 乘积小于 K 的子数组 (乘积小于 K 的子数组)
// @Author: 15816537946@163.com
// @Date: 2022-03-19 00:01:23
// @Runtime: 68 ms
// @Memory: 7.3 MB
func numSubarrayProductLessThanK(nums []int, k int) int {
    lo, hi :=0, 0
    var ans int
    product :=1

    for hi < len(nums) {
        product *= nums[hi]

        for lo <= hi  && product >= k {
            product/= nums[lo]
            lo++
        }
        if lo <= hi {
            ans += hi-lo+1
        }
        hi++
    }

    return ans
}