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Asked: 2026-05-23T11:50:20+00:00

in Python, given two lists of pairs: listA = [ [1,20], [3,19], [37,11], [21,17]

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in Python, given two lists of pairs: 

listA = [ [1,20], [3,19], [37,11], [21,17] ]
listB = [ [1,20], [21,17] ]

how do you efficiently write a python function which return True if listB is a subset of listA? oh and [1,20] pair is equivalent to [20,1]

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1 Answer

  1. Editorial Team

    Use frozenset.

    >>> listA = [ [1,20], [3,19], [37,11], [21,17] ]
>>> listB = [ [1,20], [21,17] ]

>>> setA = frozenset([frozenset(element) for element in listA])
>>> setB = frozenset([frozenset(element) for element in listB])

>>> setA
frozenset([frozenset([17, 21]), frozenset([1, 20]), frozenset([11, 37]), frozens
et([19, 3])])
>>> setB
frozenset([frozenset([17, 21]), frozenset([1, 20])])

>>> setB <= setA
True
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