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First solution in Clear category for What Is Wrong With This Family? by cs1g
def is_family(tree):
family_tree = {}
for father, son in tree:
if son == father:
return False
if son in family_tree:
return False
if father in family_tree and family_tree[father] == son:
return False
family_tree[son] = father
fathers = set(family_tree.values())
for father in family_tree.values():
if father in family_tree:
fathers.discard(father)
return len(fathers) == 1
if __name__ == "__main__":
#These "asserts" using only for self-checking and not necessary for auto-testing
assert is_family([
['Logan', 'Mike']
]) == True, 'One father, one son'
assert is_family([
['Logan', 'Mike'],
['Logan', 'Jack']
]) == True, 'Two sons'
assert is_family([
['Logan', 'Mike'],
['Logan', 'Jack'],
['Mike', 'Alexander']
]) == True, 'Grandfather'
assert is_family([
['Logan', 'Mike'],
['Logan', 'Jack'],
['Mike', 'Logan']
]) == False, 'Can you be a father for your father?'
assert is_family([
['Logan', 'Mike'],
['Logan', 'Jack'],
['Mike', 'Jack']
]) == False, 'Can you be a father for your brather?'
assert is_family([
['Logan', 'William'],
['Logan', 'Jack'],
['Mike', 'Alexander']
]) == False, 'Looks like Mike is stranger in Logan\'s family'
print("Looks like you know everything. It is time for 'Check'!")
May 31, 2017
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