第一行只有一个正整数，代表公司的部门数目。
There is only a first positive integer representing the number of departments.
这个函数返回一个整数，代表子进程的退出码。
The function returns an integer, which represents the exit code for the child process.
这个函数返回一个整数，代表子进程的退出码。
The function returns an integer, which represents the exit code for the child process.
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