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Question 4 of 204:12 left
A shop logs sales for every day of the year. How do you answer “total between two dates” instantly?
- ASorting the range first
- BPrefix sums, built once
- CA balanced search tree
- DRecounting every query
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Test completeData structures midterm
17out of 2085%
- RightWhat does a prefix sum answer in O(1)?
- RightWhich structure looks up a key in O(1)?
- WrongQuicksort's worst case with a bad pivot?
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