leetcode-problemset/leetcode-cn/originData/count-subarrays-of-length-three-with-a-condition.json

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            "questionId": "3685",
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            "categoryTitle": "Algorithms",
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            "title": "Count Subarrays of Length Three With a Condition",
            "titleSlug": "count-subarrays-of-length-three-with-a-condition",
            "content": "<p>Given an integer array <code>nums</code>, return the number of <span data-keyword=\"subarray-nonempty\">subarrays</span> of length 3 such that the sum of the first and third numbers equals <em>exactly</em> half of the second number.</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 = [1,2,1,4,1]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Only the subarray <code>[1,4,1]</code> contains exactly 3 elements where the sum of the first and third numbers equals half the middle number.</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 = [1,1,1]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><code>[1,1,1]</code> is the only subarray of length 3. However, its first and third numbers do not add to half the middle number.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code><font face=\"monospace\">-100 &lt;= nums[i] &lt;= 100</font></code></li>\n</ul>\n",
            "translatedTitle": "统计符合条件长度为 3 的子数组数目",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code>&nbsp;，请你返回长度为 3 的 <span data-keyword=\"subarray-nonempty\">子数组</span>，满足第一个数和第三个数的和恰好为第二个数的一半。</p>\n\n<p><strong>子数组</strong>&nbsp;指的是一个数组中连续 <strong>非空</strong>&nbsp;的元素序列。</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><span class=\"example-io\"><b>输入：</b>nums = [1,2,1,4,1]</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>1</span></p>\n\n<p><b>解释：</b></p>\n\n<p>只有子数组&nbsp;<code>[1,4,1]</code>&nbsp;包含 3 个元素且第一个和第三个数字之和是中间数字的一半。number.</p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>nums = [1,1,1]</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>0</span></p>\n\n<p><b>解释：</b></p>\n\n<p><code>[1,1,1]</code>&nbsp;是唯一长度为 3 的子数组，但第一个数和第三个数的和不是第二个数的一半。</p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code><font face=\"monospace\">-100 &lt;= nums[i] &lt;= 100</font></code></li>\n</ul>\n",
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