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Difficulty: Medium
Category: Number Theory & Algorithms
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Topics: probability, hashing, birthday-paradox, algorithms
Your team is building a high-frequency trading system. You're using a hash table to quickly look up order IDs. You have $M$ buckets in your hash table. You expect to insert $N$ order IDs into the table. Approximately how large can $N$ be before you should expect a hash collision? Assume a perfectly uniform hash function.
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