进程 vs 线程
http://www.ruanyifeng.com/blog/2013/04/processes_and_threads.html
操作系统的设计，因此可以归结为三点：
（1）以多进程形式，允许多个任务同时运行；
（2）以多线程形式，允许单个任务分成不同的部分运行；
（3）提供协调机制，一方面防止进程之间和线程之间产生冲突，另一方面允许进程之间和线程之间共享资源。
1386. Cinema Seat Allocation
1386. Cinema Seat Allocation A cinema has n rows of seats, numbered from 1 to n and there are ten seats in each row, labelled from 1 to 10 as shown in the figure above. Given the array reservedSeats containing the numbers of seats already reserved, for example, reservedSeats[i]=[3,8] means the seat located in row 3 and labelled with 8 is already reserved. Return the maximum number of four-person families you can allocate on the cinema seats. A four-person family occupies fours seats in one row , that are next to each other . Seats across an aisle (such as [3,3] and [3,4]) are not considered to be next to each other, however, It is permissible for the four-person family to be separated by an aisle, but in that case, exactly two people have to sit on each side of the aisle. Example 1: Input: n = 3, reservedSeats = [[1,2],[1,3]...
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