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"title": "Count Number of Nice Subarrays",
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"content": "<p>Given an array of integers <code>nums</code> and an integer <code>k</code>. A continuous subarray is called <strong>nice</strong> if there are <code>k</code> odd numbers on it.</p>\r\n\r\n<p>Return <em>the number of <strong>nice</strong> sub-arrays</em>.</p>\r\n\r\n<p> </p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [1,1,2,1,1], k = 3\r\n<strong>Output:</strong> 2\r\n<strong>Explanation:</strong> The only sub-arrays with 3 odd numbers are [1,1,2,1] and [1,2,1,1].\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [2,4,6], k = 1\r\n<strong>Output:</strong> 0\r\n<strong>Explanation:</strong> There is no odd numbers in the array.\r\n</pre>\r\n\r\n<p><strong>Example 3:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> nums = [2,2,2,1,2,2,1,2,2,2], k = 2\r\n<strong>Output:</strong> 16\r\n</pre>\r\n\r\n<p> </p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 <= nums.length <= 50000</code></li>\r\n\t<li><code>1 <= nums[i] <= 10^5</code></li>\r\n\t<li><code>1 <= k <= nums.length</code></li>\r\n</ul>",
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"code": "class Solution(object):\r\n def numberOfSubarrays(self, nums, k):\r\n \"\"\"\r\n :type nums: List[int]\r\n :type k: int\r\n :rtype: int\r\n \"\"\"",
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"code": "# @param {Integer[]} nums\r\n# @param {Integer} k\r\n# @return {Integer}\r\ndef number_of_subarrays(nums, k)\r\n \r\nend",
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"hints": [
"After replacing each even by zero and every odd by one can we use prefix sum to find answer ?",
"Can we use two pointers to count number of sub-arrays ?",
"Can we store indices of odd numbers and for each k indices count number of sub-arrays contains them ?"
],
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