leetcode-problemset/leetcode-cn/originData/find-the-town-judge.json

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            "questionId": "1039",
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            "categoryTitle": "Algorithms",
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            "title": "Find the Town Judge",
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            "content": "<p>In a town, there are <code>n</code> people labeled from <code>1</code> to <code>n</code>. There is a rumor that one of these people is secretly the town judge.</p>\n\n<p>If the town judge exists, then:</p>\n\n<ol>\n\t<li>The town judge trusts nobody.</li>\n\t<li>Everybody (except for the town judge) trusts the town judge.</li>\n\t<li>There is exactly one person that satisfies properties <strong>1</strong> and <strong>2</strong>.</li>\n</ol>\n\n<p>You are given an array <code>trust</code> where <code>trust[i] = [a<sub>i</sub>, b<sub>i</sub>]</code> representing that the person labeled <code>a<sub>i</sub></code> trusts the person labeled <code>b<sub>i</sub></code>.</p>\n\n<p>Return <em>the label of the town judge if the town judge exists and can be identified, or return </em><code>-1</code><em> otherwise</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2, trust = [[1,2]]\n<strong>Output:</strong> 2\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, trust = [[1,3],[2,3]]\n<strong>Output:</strong> 3\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, trust = [[1,3],[2,3],[3,1]]\n<strong>Output:</strong> -1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 1000</code></li>\n\t<li><code>0 &lt;= trust.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>trust[i].length == 2</code></li>\n\t<li>All the pairs of <code>trust</code> are <strong>unique</strong>.</li>\n\t<li><code>a<sub>i</sub> != b<sub>i</sub></code></li>\n\t<li><code>1 &lt;= a<sub>i</sub>, b<sub>i</sub> &lt;= n</code></li>\n</ul>\n",
            "translatedTitle": "找到小镇的法官",
            "translatedContent": "<p>小镇里有 <code>n</code> 个人，按从 <code>1</code> 到 <code>n</code> 的顺序编号。传言称，这些人中有一个暗地里是小镇法官。</p>\n\n<p>如果小镇法官真的存在，那么：</p>\n\n<ol>\n\t<li>小镇法官不会信任任何人。</li>\n\t<li>每个人（除了小镇法官）都信任这位小镇法官。</li>\n\t<li>只有一个人同时满足属性 <strong>1</strong> 和属性 <strong>2</strong> 。</li>\n</ol>\n\n<p>给你一个数组 <code>trust</code> ，其中 <code>trust[i] = [a<sub>i</sub>, b<sub>i</sub>]</code> 表示编号为 <code>a<sub>i</sub></code> 的人信任编号为 <code>b<sub>i</sub></code> 的人。</p>\n\n<p>如果小镇法官存在并且可以确定他的身份，请返回该法官的编号；否则，返回 <code>-1</code> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 2, trust = [[1,2]]\n<strong>输出：</strong>2\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 3, trust = [[1,3],[2,3]]\n<strong>输出：</strong>3\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 3, trust = [[1,3],[2,3],[3,1]]\n<strong>输出：</strong>-1\n</pre>\n&nbsp;\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 1000</code></li>\n\t<li><code>0 &lt;= trust.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>trust[i].length == 2</code></li>\n\t<li><code>trust</code> 中的所有<code>trust[i] = [a<sub>i</sub>, b<sub>i</sub>]</code> <strong>互不相同</strong></li>\n\t<li><code>a<sub>i</sub> != b<sub>i</sub></code></li>\n\t<li><code>1 &lt;= a<sub>i</sub>, b<sub>i</sub> &lt;= n</code></li>\n</ul>\n",
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