Subarray Product Less Than K
Your are given an array of positive integers nums
.
Count and print the number of (contiguous) subarrays where the product of all the elements in the subarray is less than k
.
Example 1:
Input: nums = [10, 5, 2, 6], k = 100
Output: 8
Explanation: The 8 subarrays that have product less than 100 are: [10], [5], [2], [6], [10, 5], [5, 2], [2, 6], [5, 2, 6].
Note that [10, 5, 2] is not included as the product of 100 is not strictly less than k.
Note:
0 < nums.length <= 50000
.
0 < nums[i] < 1000
.
0 <= k < 10^6
.
class Solution {
public int numSubarrayProductLessThanK(int[] nums, int k) {
if (k == 0)
return 0;
int count = 0;
int product = 1;
// Sliding window
for (int start = 0, end = 0; end < nums.length; end++) {
product *= nums[end];
while (start <= end && product >= k) {
product /= nums[start++];
}
count += end - start + 1;
}
return count;
}
}
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