leetcode-problemset/leetcode-cn/originData/count-alternating-subarrays.json

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        "question": {
            "questionId": "3374",
            "questionFrontendId": "3101",
            "categoryTitle": "Algorithms",
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            "title": "Count Alternating Subarrays",
            "titleSlug": "count-alternating-subarrays",
            "content": "<p>You are given a <span data-keyword=\"binary-array\">binary array</span> <code>nums</code>.</p>\n\n<p>We call a <span data-keyword=\"subarray-nonempty\">subarray</span> <strong>alternating</strong> if <strong>no</strong> two <strong>adjacent</strong> elements in the subarray have the <strong>same</strong> value.</p>\n\n<p>Return <em>the number of alternating subarrays in </em><code>nums</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [0,1,1,1]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">5</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The following subarrays are alternating: <code>[0]</code>, <code>[1]</code>, <code>[1]</code>, <code>[1]</code>, and <code>[0,1]</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [1,0,1,0]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">10</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Every subarray of the array is alternating. There are 10 possible subarrays that we can choose.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>nums[i]</code> is either <code>0</code> or <code>1</code>.</li>\n</ul>\n",
            "translatedTitle": "交替子数组计数",
            "translatedContent": "<p>给你一个<span data-keyword=\"binary-array\">二进制数组 </span><code>nums</code> 。</p>\n\n<p>如果一个<span data-keyword=\"subarray-nonempty\">子数组</span>中 <strong>不存在 </strong>两个 <strong>相邻 </strong>元素的值 <strong>相同</strong> 的情况，我们称这样的子数组为 <strong>交替子数组 </strong>。</p>\n\n<p>返回数组 <code>nums</code> 中交替子数组的数量。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">nums = [0,1,1,1]</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">5</span></p>\n\n<p><strong>解释：</strong></p>\n<!-- 解释示例1的交替子数组 -->\n\n<p>以下子数组是交替子数组：<code>[0]</code> 、<code>[1]</code> 、<code>[1]</code> 、<code>[1]</code> 以及 <code>[0,1]</code> 。</p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">nums = [1,0,1,0]</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">10</span></p>\n\n<p><strong>解释：</strong></p>\n<!-- 解释示例2的交替子数组 -->\n\n<p>数组的每个子数组都是交替子数组。可以统计在内的子数组共有 10 个。</p>\n</div>\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;= 10<sup>5</sup></code></li>\n\t<li><code>nums[i]</code> 不是 <code>0</code> 就是 <code>1</code> 。</li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    long long countAlternatingSubarrays(vector<int>& nums) {\n        \n    }\n};",
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                    "code": "class Solution(object):\n    def countAlternatingSubarrays(self, nums):\n        \"\"\"\n        :type nums: List[int]\n        :rtype: int\n        \"\"\"",
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                    "code": "# @param {Integer[]} nums\n# @return {Integer}\ndef count_alternating_subarrays(nums)\n\nend",
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            "hints": [
                "Try using dynamic programming.",
                "Let <code>dp[i]</code> be the number of alternating subarrays ending at index <code>i</code>.",
                "The final answer is the sum of <code>dp[i]</code> over all  indices <code>i</code> from <code>0</code> to <code>n - 1</code>."
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