Open-addressing hash table.
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How does a Python set find items?
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01
Understand the problem
sethashing
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A set is an open-addressing hash table: it hashes the element to a slot and probes forward on collision, giving average O(1) membership.
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PYO(1) set membership vs O(n) list scan
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Dossier 120 of 120 decoded in the Python track. One more won't hurt.