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31 lines
523 B
Python
31 lines
523 B
Python
"""Count equal element pairs in the given array"""
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import doctest
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from collections import Counter
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def sock_merchant(ar: list[int]) -> int:
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"""
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>>> sock_merchant([10, 20, 20, 10, 10, 30, 50, 10, 20])
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3
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>>> sock_merchant([1, 1, 3, 3])
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2
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"""
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i = 0
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occur = Counter(ar)
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for x in occur.values():
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i += x // 2
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return i
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if __name__ == "__main__":
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array = list(map(int, input().rstrip().split()))
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result = sock_merchant(array)
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print(result)
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doctest.testmod()
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