1
var numSubarrayProductLessThanK = function (nums, k) {
2
  var used = new Array(nums.length).fill(0);
3
  var l,
4
    r,
5
    runsum = 1;
6
  let ans = 0;
7

8
  l = 0;
9
  r = 0;
10
  while (r < nums.length) {
11
    if (r < nums.length && runsum * nums[r] >= k) {
12
      if (r != l) runsum /= nums[l];
13
      else r++;
14
      l++;
15
    } else if (l <= r) {
16
      runsum *= nums[r];
17
      r++;
18
      ans += r - l;
19
    } else break;
20
  }
21

22
  return ans;
23
};