public class Solution
extends Object
1248 - Count Number of Nice Subarrays\.
Medium
Given an array of integers `nums` and an integer `k`. A continuous subarray is called **nice** if there are `k` odd numbers on it.
Return _the number of **nice** sub-arrays_.
**Example 1:**
**Input:** nums = [1,1,2,1,1], k = 3
**Output:** 2
**Explanation:** The only sub-arrays with 3 odd numbers are [1,1,2,1] and [1,2,1,1].
**Example 2:**
**Input:** nums = [2,4,6], k = 1
**Output:** 0
**Explanation:** There is no odd numbers in the array.
**Example 3:**
**Input:** nums = [2,2,2,1,2,2,1,2,2,2], k = 2
**Output:** 16
**Constraints:**
* `1 <= nums.length <= 50000`
* `1 <= nums[i] <= 10^5`
* `1 <= k <= nums.length`