leetcode-problemset/leetcode-cn/originData/count-special-quadruplets.json

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        "question": {
            "questionId": "2122",
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            "categoryTitle": "Algorithms",
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            "title": "Count Special Quadruplets",
            "titleSlug": "count-special-quadruplets",
            "content": "<p>Given a <strong>0-indexed</strong> integer array <code>nums</code>, return <em>the number of <strong>distinct</strong> quadruplets</em> <code>(a, b, c, d)</code> <em>such that:</em></p>\n\n<ul>\n\t<li><code>nums[a] + nums[b] + nums[c] == nums[d]</code>, and</li>\n\t<li><code>a &lt; b &lt; c &lt; d</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,3,6]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The only quadruplet that satisfies the requirement is (0, 1, 2, 3) because 1 + 2 + 3 == 6.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,3,6,4,5]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no such quadruplets in [3,3,6,4,5].\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,1,1,3,5]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> The 4 quadruplets that satisfy the requirement are:\n- (0, 1, 2, 3): 1 + 1 + 1 == 3\n- (0, 1, 3, 4): 1 + 1 + 3 == 5\n- (0, 2, 3, 4): 1 + 1 + 3 == 5\n- (1, 2, 3, 4): 1 + 1 + 3 == 5\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>4 &lt;= nums.length &lt;= 50</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 100</code></li>\n</ul>\n",
            "translatedTitle": "统计特殊四元组",
            "translatedContent": "<p>给你一个 <strong>下标从 0 开始</strong> 的整数数组 <code>nums</code> ，返回满足下述条件的 <strong>不同</strong> 四元组 <code>(a, b, c, d)</code> 的 <strong>数目</strong> ：</p>\n\n<ul>\n\t<li><code>nums[a] + nums[b] + nums[c] == nums[d]</code> ，且</li>\n\t<li><code>a &lt; b &lt; c &lt; d</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>nums = [1,2,3,6]\n<strong>输出：</strong>1\n<strong>解释：</strong>满足要求的唯一一个四元组是 (0, 1, 2, 3) 因为 1 + 2 + 3 == 6 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>nums = [3,3,6,4,5]\n<strong>输出：</strong>0\n<strong>解释：</strong>[3,3,6,4,5] 中不存在满足要求的四元组。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>nums = [1,1,1,3,5]\n<strong>输出：</strong>4\n<strong>解释：</strong>满足要求的 4 个四元组如下：\n- (0, 1, 2, 3): 1 + 1 + 1 == 3\n- (0, 1, 3, 4): 1 + 1 + 3 == 5\n- (0, 2, 3, 4): 1 + 1 + 3 == 5\n- (1, 2, 3, 4): 1 + 1 + 3 == 5\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>4 &lt;= nums.length &lt;= 50</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 100</code></li>\n</ul>\n",
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                "N is very small, how can we use that?",
                "Can we check every possible quadruplet?"
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