Pinterest phone screen

Interviewed for Senior level. The interviewer first asked behavioral questions  like have you used Pinterest. What are some features that you will improve.
Then switched to coding question.

A passcode can contain numbers between 0-9 and it will have length N.
Given a set of numbers in the passcod

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in the valid passcode can occur atmost N-nums.length times.
And also the numbers in the input list should occur at least once.

Please give points!! I really need...

想请问楼主一个问题：长度为N的passcode有很多种不同的组合，请问如何确定passcode是不是target passcode呢？期待楼主回复，感谢感谢！

求问lz这是面DS还是MLE啊？多谢