In a town, there are n people labeled from 1 to n. There is a rumor that one of these people is secretly the town judge.
If the town judge exists, then:
\n\nYou are given an array trust where trust[i] = [ai, bi] representing that the person labeled ai trusts the person labeled bi. If a trust relationship does not exist in trust array, then such a trust relationship does not exist.
Return the label of the town judge if the town judge exists and can be identified, or return -1 otherwise.
\n
Example 1:
\n\n\nInput: n = 2, trust = [[1,2]]\nOutput: 2\n\n\n
Example 2:
\n\n\nInput: n = 3, trust = [[1,3],[2,3]]\nOutput: 3\n\n\n
Example 3:
\n\n\nInput: n = 3, trust = [[1,3],[2,3],[3,1]]\nOutput: -1\n\n\n
\n
Constraints:
\n\n1 <= n <= 10000 <= trust.length <= 104trust[i].length == 2trust are unique.ai != bi1 <= ai, bi <= n小镇里有 n 个人，按从 1 到 n 的顺序编号。传言称，这些人中有一个暗地里是小镇法官。
如果小镇法官真的存在，那么：
\n\n给你一个数组 trust ，其中 trust[i] = [ai, bi] 表示编号为 ai 的人信任编号为 bi 的人。
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 -1 。
\n\n
示例 1：
\n\n\n输入：n = 2, trust = [[1,2]]\n输出：2\n\n\n
示例 2：
\n\n\n输入：n = 3, trust = [[1,3],[2,3]]\n输出：3\n\n\n
示例 3：
\n\n\n输入：n = 3, trust = [[1,3],[2,3],[3,1]]\n输出：-1\n\n \n\n
提示：
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"editorType": "CKEDITOR",
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"style": "LEETCODE",
"exampleTestcases": "2\n[[1,2]]\n3\n[[1,3],[2,3]]\n3\n[[1,3],[2,3],[3,1]]",
"__typename": "QuestionNode"
}
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