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First solution in Clear category for What Is Wrong With This Family? by jktujgxtu
def is_family(tree):
fathers = [x for x, _ in tree]
sons = [x for _, x in tree]
if len(sons) != len(set(sons)): #son may have only 1 father
return False
for f, s in tree:
if [s,f] in tree: #son can't be a father of his father
return False
elif f not in sons and f != fathers[0]: #check for strangers
if s not in fathers:
return False
return True
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 to your father?'
assert is_family([
['Logan', 'Mike'],
['Logan', 'Jack'],
['Mike', 'Jack']
]) == False, 'Can you be a father to your brother?'
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'!")
June 7, 2020
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