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Given two lists of user IDs, the first being a list of people who have visited the website on Day 1, the second being a list of people who have visited on Day 2, what is an efficient algorithm to determine who visited on both days?
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Software Development Co-op

Interviewed at Amazon

3.5
May 6, 2011

Given two lists of user IDs, the first being a list of people who have visited the website on Day 1, the second being a list of people who have visited on Day 2, what is an efficient algorithm to determine who visited on both days?

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