find_town_judge.py (1013B)
| # 997. 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:
the town judge trusts nobody. everybody (except the judge) trusts the judge.
given: array 'trust' where 'trust[i]' = [ai, bi] representing the the person
labeled ai trusts the person labeled bi. return label of judge, if they exist.
"""
class Solution(object):
def findJudge(self, n, trust):
"""
:type n: int
:type trust: List[List[int]]
:rtype: int
"""
cnt = [0] * (n + 1)
for i, j in trust:
cnt[i] -= 1
cnt[j] += 1
for i in range(1, n + 1):
if cnt[i] == n - 1:
return i
return -1
if __name__ == "__main__":
obj = Solution()
print(obj.findJudge(n=2, trust=[[1, 2]]))
print(obj.findJudge(n=3, trust=[[1, 3], [2, 3]]))
print(obj.findJudge(n=3, trust=[[1, 3], [2, 3], [3, 1]]))
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