284. Find the Town Judge

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:
1. The town judge trusts nobody.
2. Everybody (except for the town judge) trusts the town judge.
3. There is exactly one person that satisfies properties 1 and 2.

You are given an array trust where trust[i] = [a, b] represents that person a trusts person b. Return the label of the town judge if exists, or -1 otherwise.

Example:
Input: n = 3, trust = [[1,3],[2,3]]
Output: 3

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