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leetcode/problem/find-the-town-judge.html
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<li>There is exactly one person that satisfies properties <strong>1</strong> and <strong>2</strong>.</li>
</ol>
<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>
<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>
<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>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> n = 2, trust = [[1,2]]
<strong>Output:</strong> 2
</pre>
<p><strong>Example 2:</strong></p>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> n = 3, trust = [[1,3],[2,3]]
<strong>Output:</strong> 3
</pre>
<p><strong>Example 3:</strong></p>
<p><strong class="example">Example 3:</strong></p>
<pre>
<strong>Input:</strong> n = 3, trust = [[1,3],[2,3],[3,1]]