LeetCode May Challenge – Find the Town Judge – [10. GÜN]

LeetCode’un mayıs ayı için her gün bir programlama sorusu sorduğu “May Challenge”‘ın 10. gün sorusu “Find the Town Judge””ın açıklaması ve çözümü.

🔥 LeetCode May Challenge: https://leetcode.com/explore/featured/card/may-leetcoding-challenge

➡️ Problem açıklaması:

In a town, there are N people labelled from 1 to N. There is a rumor that one of these people is secretly the town judge.

If the town judge exists, then:

– The town judge trusts nobody.

– Everybody (except for the town judge) trusts the town judge.

– There is exactly one person that satisfies properties 1 and 2.

You are given trust, an array of pairs trust[i] = [a, b] representing that the person labelled a trusts the person labelled b.

If the town judge exists and can be identified, return the label of the town judge. Otherwise, return -1.

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

Example 4:

Input: N = 3, trust = [[1,2],[2,3]]

Output: -1

Example 5:

Input: N = 4, trust = [[1,3],[1,4],[2,3],[2,4],[4,3]]

Output: 3