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Given login/logout time of all users for a particular website in the form: (userId, login time, logout time). Store this data, to query the total

Given login/logout time of all users for a particular website in the form: (userId, login time, logout time). Store this data, to query the total number of users who logged in and logged out in a given time range.

Please give a more optimal solution, I know how to accomplish this with a brute force method.

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