Proofpoint take home assignment

Can you determine if a phone number is "easy to dial" based on each digit's physical location on a standard phone keypad?
Assume you have a standard phone keypad that looks like this:


[        DISCUZ_CO

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55- 8123" are not.
Write a function that takes as input a phone number and returns whether or not it is easy to dial.

想问下楼主申请的是什么岗位么?

楼主能分享一下是怎么做的嘛