(This question has been seen in the interviews of the following companies: Google)
(Google)
Gate Crossing Times
An office building has one smart turnstile at its entrance. People tap their phone or badge on the reader, and the gate opens for one person per second, in either direction. If someone is already passing, everyone else waits in line.
You are given a list people, sorted by time. people[i] = [time, action] means person i taps the reader at that second and wants to “enter” or “exit”. Return a list answer, where answer[i] is the second person i actually passes through the turnstile.
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