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

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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>. If a trust relationship does not exist in <code>trust</code> array, then such a trust relationship does not exist.</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 class=\"example\">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 class=\"example\">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 class=\"example\">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",
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