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First solution in Clear category for Friends by freeman_lex
class Friends:
def __init__(self, connections):
self.conn = set(map(frozenset, connections))
def add(self, connection):
res = connection in self.conn
self.conn.add(frozenset(connection))
return not res
def remove(self, connection):
res = connection in self.conn
self.conn.discard(frozenset(connection))
return res
def names(self):
return set(sum(map(list, self.conn), []))
def connected(self, name):
res = set()
for pair in self.conn:
if name in pair:
res |= pair
return res - {name}
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
letter_friends = Friends(({"a", "b"}, {"b", "c"}, {"c", "a"}, {"a", "c"}))
digit_friends = Friends([{"1", "2"}, {"3", "1"}])
assert letter_friends.add({"c", "d"}) is True, "Add"
assert letter_friends.add({"c", "d"}) is False, "Add again"
assert letter_friends.remove({"c", "d"}) is True, "Remove"
assert digit_friends.remove({"c", "d"}) is False, "Remove non exists"
assert letter_friends.names() == {"a", "b", "c"}, "Names"
assert letter_friends.connected("d") == set(), "Non connected name"
assert letter_friends.connected("a") == {"b", "c"}, "Connected name"
April 1, 2023
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