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Since CPython 3.6, normal dict keep the insertion order. Since Python 3.7, it is a guaranteed language feature. So you can just check the version of Python and use a normal dict instead of an OrderedDict (or better here, a defaultdict) and it will work with all implementations of Python 3.7+. It works on Hackerrank for this exercise, both with a dict and a defaultdict.
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Collections.OrderedDict()
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Since CPython 3.6, normal
dictkeep the insertion order. Since Python 3.7, it is a guaranteed language feature. So you can just check the version of Python and use a normaldictinstead of an OrderedDict (or better here, adefaultdict) and it will work with all implementations of Python 3.7+. It works on Hackerrank for this exercise, both with adictand adefaultdict.