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for sock in ar:
if sock not in pair_nopair:
pair_nopair[sock] = True
continue
if pair_nopair[sock]:
no_pairs = no_pairs + 1
pair_nopair[sock] = not pair_nopair[sock]
return no_pairs
`
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` //// Python, using dict and flags:
def sockMerchant(n, ar): no_pairs : int = 0 pair_nopair : dict[int, bool] = {}
`