This is an app for checking the line of bathrooms/office hours/things like that. It automatically calculate the waiting time according to the times people open this app. It does not require any other information besides the device ID of the phone and use the ID to make an estimated queue, calculate the waiting time, and pop off the old ones in the queue. This app simplifies the actions the user needs to take and does not require additional checkers or servers to maintain the system.

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