题目
Given the array favoriteCompanies where favoriteCompanies[i] is the list of favorites companies for the ith person (indexed from 0).
Return the indices of people whose list of favorite companies is not a subset of any other list of favorites companies. You must return the indices in increasing order.
解题思路
把所有人喜爱的公司转换成set，遍历每个人，判断他喜欢的公司不是其它人的子集
代码
class Solution:
def peopleIndexes(self, favoriteCompanies: List[List[str]]) -> List[int]:
s = [set(f) for f in favoriteCompanies]
n = len(s)
res = []
for i in range(n):
for j in range(n):
if i != j and s[i].issubset(s[j]):
break
else:
res.append(i)
return res
