leetcode-problemset/leetcode-cn/originData/count-number-of-nice-subarrays.json

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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>&nbsp;</p>\r\n<p><strong class=\"example\">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 class=\"example\">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 class=\"example\">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>&nbsp;</p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 &lt;= nums.length &lt;= 50000</code></li>\r\n\t<li><code>1 &lt;= nums[i] &lt;= 10^5</code></li>\r\n\t<li><code>1 &lt;= k &lt;= nums.length</code></li>\r\n</ul>",
            "translatedTitle": "统计「优美子数组」",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code> 和一个整数 <code>k</code>。如果某个连续子数组中恰好有 <code>k</code> 个奇数数字，我们就认为这个子数组是「<strong>优美子数组</strong>」。</p>\n\n<p>请返回这个数组中 <strong>「优美子数组」</strong> 的数目。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,1,2,1,1], k = 3\n<strong>输出：</strong>2\n<strong>解释：</strong>包含 3 个奇数的子数组是 [1,1,2,1] 和 [1,2,1,1] 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [2,4,6], k = 1\n<strong>输出：</strong>0\n<strong>解释：</strong>数列中不包含任何奇数，所以不存在优美子数组。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [2,2,2,1,2,2,1,2,2,2], k = 2\n<strong>输出：</strong>16\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 50000</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10^5</code></li>\n\t<li><code>1 &lt;= k &lt;= nums.length</code></li>\n</ul>\n",
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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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