leetcode-problemset/leetcode-cn/originData/count-covered-buildings.json

{
    "data": {
        "question": {
            "questionId": "3819",
            "questionFrontendId": "3531",
            "categoryTitle": "Algorithms",
            "boundTopicId": 3662482,
            "title": "Count Covered Buildings",
            "titleSlug": "count-covered-buildings",
            "content": "<p>You are given a positive integer <code>n</code>, representing an <code>n x n</code> city. You are also given a 2D grid <code>buildings</code>, where <code>buildings[i] = [x, y]</code> denotes a <strong>unique</strong> building located at coordinates <code>[x, y]</code>.</p>\n\n<p>A building is <strong>covered</strong> if there is at least one building in all <strong>four</strong> directions: left, right, above, and below.</p>\n\n<p>Return the number of <strong>covered</strong> buildings.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2025/03/04/telegram-cloud-photo-size-5-6212982906394101085-m.jpg\" style=\"width: 200px; height: 204px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 3, buildings = [[1,2],[2,2],[3,2],[2,1],[2,3]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>Only building <code>[2,2]</code> is covered as it has at least one building:\n\n\t<ul>\n\t\t<li>above (<code>[1,2]</code>)</li>\n\t\t<li>below (<code>[3,2]</code>)</li>\n\t\t<li>left (<code>[2,1]</code>)</li>\n\t\t<li>right (<code>[2,3]</code>)</li>\n\t</ul>\n\t</li>\n\t<li>Thus, the count of covered buildings is 1.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2025/03/04/telegram-cloud-photo-size-5-6212982906394101086-m.jpg\" style=\"width: 200px; height: 204px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 3, buildings = [[1,1],[1,2],[2,1],[2,2]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>No building has at least one building in all four directions.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2025/03/16/telegram-cloud-photo-size-5-6248862251436067566-x.jpg\" style=\"width: 202px; height: 205px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 5, buildings = [[1,3],[3,2],[3,3],[3,5],[5,3]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>Only building <code>[3,3]</code> is covered as it has at least one building:\n\n\t<ul>\n\t\t<li>above (<code>[1,3]</code>)</li>\n\t\t<li>below (<code>[5,3]</code>)</li>\n\t\t<li>left (<code>[3,2]</code>)</li>\n\t\t<li>right (<code>[3,5]</code>)</li>\n\t</ul>\n\t</li>\n\t<li>Thus, the count of covered buildings is 1.</li>\n</ul>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= buildings.length &lt;= 10<sup>5</sup> </code></li>\n\t<li><code>buildings[i] = [x, y]</code></li>\n\t<li><code>1 &lt;= x, y &lt;= n</code></li>\n\t<li>All coordinates of <code>buildings</code> are <strong>unique</strong>.</li>\n</ul>\n",
            "translatedTitle": "统计被覆盖的建筑",
            "translatedContent": "<p>给你一个正整数 <code>n</code>，表示一个 <code>n x n</code> 的城市，同时给定一个二维数组 <code>buildings</code>，其中 <code>buildings[i] = [x, y]</code> 表示位于坐标 <code>[x, y]</code> 的一个&nbsp;<strong>唯一&nbsp;</strong>建筑。</p>\n\n<p>如果一个建筑在四个方向（左、右、上、下）中每个方向上都至少存在一个建筑，则称该建筑&nbsp;<strong>被覆盖&nbsp;</strong>。</p>\n\n<p>返回&nbsp;<strong>被覆盖&nbsp;</strong>的建筑数量。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<p><img src=\"https://pic.leetcode.cn/1745660407-qtNUjI-telegram-cloud-photo-size-5-6212982906394101085-m.jpg\" style=\"width: 200px; height: 204px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>输入:</strong> <span class=\"example-io\">n = 3, buildings = [[1,2],[2,2],[3,2],[2,1],[2,3]]</span></p>\n\n<p><strong>输出:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>解释:</strong></p>\n\n<ul>\n\t<li>只有建筑 <code>[2,2]</code> 被覆盖，因为它在每个方向上都至少存在一个建筑：\n\n\t<ul>\n\t\t<li>上方 (<code>[1,2]</code>)</li>\n\t\t<li>下方 (<code>[3,2]</code>)</li>\n\t\t<li>左方 (<code>[2,1]</code>)</li>\n\t\t<li>右方 (<code>[2,3]</code>)</li>\n\t</ul>\n\t</li>\n\t<li>因此，被覆盖的建筑数量是 1。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<p><img src=\"https://pic.leetcode.cn/1745660407-tUMUKl-telegram-cloud-photo-size-5-6212982906394101086-m.jpg\" style=\"width: 200px; height: 204px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>输入:</strong> <span class=\"example-io\">n = 3, buildings = [[1,1],[1,2],[2,1],[2,2]]</span></p>\n\n<p><strong>输出:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>解释:</strong></p>\n\n<ul>\n\t<li>没有任何一个建筑在每个方向上都有至少一个建筑。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<p><img src=\"https://pic.leetcode.cn/1745660407-bQIwBX-telegram-cloud-photo-size-5-6248862251436067566-x.jpg\" style=\"width: 202px; height: 205px;\" /></p>\n\n<div class=\"example-block\">\n<p><strong>输入:</strong> <span class=\"example-io\">n = 5, buildings = [[1,3],[3,2],[3,3],[3,5],[5,3]]</span></p>\n\n<p><strong>输出:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>解释:</strong></p>\n\n<ul>\n\t<li>只有建筑 <code>[3,3]</code> 被覆盖，因为它在每个方向上至少存在一个建筑：\n\n\t<ul>\n\t\t<li>上方 (<code>[1,3]</code>)</li>\n\t\t<li>下方 (<code>[5,3]</code>)</li>\n\t\t<li>左方 (<code>[3,2]</code>)</li>\n\t\t<li>右方 (<code>[3,5]</code>)</li>\n\t</ul>\n\t</li>\n\t<li>因此，被覆盖的建筑数量是 1。</li>\n</ul>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= buildings.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>buildings[i] = [x, y]</code></li>\n\t<li><code>1 &lt;= x, y &lt;= n</code></li>\n\t<li><code>buildings</code> 中所有坐标均&nbsp;<strong>唯一&nbsp;</strong>。</li>\n</ul>\n",
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                    "code": "class Solution {\n\n    /**\n     * @param Integer $n\n     * @param Integer[][] $buildings\n     * @return Integer\n     */\n    function countCoveredBuildings($n, $buildings) {\n        \n    }\n}",
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                    "code": "impl Solution {\n    pub fn count_covered_buildings(n: i32, buildings: Vec<Vec<i32>>) -> i32 {\n        \n    }\n}",
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                "Group buildings with the same x or y value together, and sort each group.",
                "In each sorted list, the buildings that are not at the first or last positions are covered in that direction."
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target=\\\"_blank\\\">sortedcontainers<\\/a> \\u5e93\\u3002<\\/p>\"],\"scala\":[\"Scala\",\"<p>\\u7248\\u672c\\uff1a<code>Scala 3.3.1<\\/code><\\/p>\"],\"kotlin\":[\"Kotlin\",\"<p>\\u7248\\u672c\\uff1a<code>Kotlin 2.1.10<\\/code><\\/p>\"],\"rust\":[\"Rust\",\"<p>\\u7248\\u672c\\uff1a<code>rust 1.85.0<\\/code><\\/p>\\r\\n\\r\\n<p>\\u652f\\u6301 crates.io \\u7684 <a href=\\\"https:\\/\\/crates.io\\/crates\\/rand\\\" target=\\\"_blank\\\">rand<\\/a>\\u3001<a href=\\\"https:\\/\\/crates.io\\/crates\\/regex\\\" target=\\\"_blank\\\">regex<\\/a> \\u548c <a href=\\\"https:\\/\\/crates.io\\/crates\\/itertools\\\" target=\\\"_blank\\\">itertools<\\/a><\\/p>\"],\"php\":[\"PHP\",\"<p><code>PHP 8.2<\\/code>.<\\/p>\\r\\n\\r\\n<p>With bcmath module.<\\/p>\"],\"typescript\":[\"TypeScript\",\"<p>TypeScript 5.7.3<\\/p>\\r\\n\\r\\n<p>Compile Options: --alwaysStrict --strictBindCallApply --strictFunctionTypes --target ES2024<\\/p>\\r\\n\\r\\n<p><a href=\\\"https:\\/\\/lodash.com\\\" target=\\\"_blank\\\">lodash.js<\\/a> \\u5e93\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5305\\u542b\\u3002<\\/p>\\r\\n\\r\\n<p> \\u5982\\u9700\\u4f7f\\u7528\\u961f\\u5217\\/\\u4f18\\u5148\\u961f\\u5217\\uff0c\\u60a8\\u53ef\\u4f7f\\u7528 <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/priority-queue\\/tree\\/v6.3.2\\\" target=\\\"_blank\\\"> datastructures-js\\/priority-queue@6.3.2<\\/a>\\uff0c<a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/queue\\/tree\\/v4.2.3\\\" target=\\\"_blank\\\"> datastructures-js\\/queue@4.2.3<\\/a> \\u4ee5\\u53ca <a href=\\\"https:\\/\\/github.com\\/datastructures-js\\/deque\\/tree\\/v1.0.4\\\" target=\\\"_blank\\\"> datastructures-js\\/deque@1.0.4<\\/a>\\u3002<\\/p>\"],\"racket\":[\"Racket\",\"<p><a href=\\\"https:\\/\\/docs.racket-lang.org\\/guide\\/performance.html#%28tech._c%29\\\" target=\\\"_blank\\\">Racket CS<\\/a> v8.15<\\/p>\\r\\n\\r\\n<p>\\u4f7f\\u7528 #lang racket<\\/p>\\r\\n\\r\\n<p>\\u5df2\\u9884\\u5148 (require data\\/gvector 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target=\\\"_blank\\\">\\u300c\\u4ed3\\u9889\\u7f16\\u7a0b\\u8bed\\u8a00\\u5f00\\u53d1\\u6307\\u5357\\u300d<\\/a><\\/p>\"]}",
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