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You receive a stream of integers as input, at a certain sampling point, it is given that only one integer was not received twice (but until then it is not given and many integers can be received once), print the number which was only received once.
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Senior Software Engineer

Interviewed at AppsFlyer

4.1★
Dec 28, 2020

You receive a stream of integers as input, at a certain sampling point, it is given that only one integer was not received twice (but until then it is not given and many integers can be received once), print the number which was only received once.

On the top left of the board Mr. P3 drew a micro-service, "clicks", which is being given with the IP, device ID & app ID once a user clicks a campaign. On the top right, a micro-service, "launches", which is given the IP, device ID & app ID, once the installed application is launched. On the lower center, a screen of a "dashboard" micro-service, that shows the count of installations (an installation is launching an app that was installed as a result of a "click"), has a "Report" button which display the verbose data of installations (as opposed to the aggregated count), and a switch to show data for 1 day or 7 days. He said that the count must represent the true, correct & the actual count, that is, must be updated immediately. The question was, to design the system which covers these requirements.
avatar

Senior Software Engineer

Interviewed at AppsFlyer

4.1★
Jul 29, 2019

On the top left of the board Mr. P3 drew a micro-service, "clicks", which is being given with the IP, device ID & app ID once a user clicks a campaign. On the top right, a micro-service, "launches", which is given the IP, device ID & app ID, once the installed application is launched. On the lower center, a screen of a "dashboard" micro-service, that shows the count of installations (an installation is launching an app that was installed as a result of a "click"), has a "Report" button which display the verbose data of installations (as opposed to the aggregated count), and a switch to show data for 1 day or 7 days. He said that the count must represent the true, correct & the actual count, that is, must be updated immediately. The question was, to design the system which covers these requirements.

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