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g0901_1000.s0997_find_the_town_judge.readme.md Maven / Gradle / Ivy

997\. Find the Town Judge

Easy

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] = [ai, bi] representing that the person labeled ai trusts the person labeled bi.

Return _the label of the town judge if the town judge exists and can be identified, or return_ `-1` _otherwise_.

**Example 1:**

**Input:** n = 2, trust = [[1,2]]

**Output:** 2

**Example 2:**

**Input:** n = 3, trust = [[1,3],[2,3]]

**Output:** 3

**Example 3:**

**Input:** n = 3, trust = [[1,3],[2,3],[3,1]]

**Output:** -1

**Constraints:**

*   `1 <= n <= 1000`
*   0 <= trust.length <= 104
*   `trust[i].length == 2`
*   All the pairs of `trust` are **unique**.
*   ai != bi
*   1 <= ai, bi <= n