Reviewer:
- Xing Cui(xc918)
- Yuting Gui(yg1281)
Add some comments on what will be generated by combinations().
The first thing I suggest is to put author name at the beginning.
Second, line 39 and 40 show there is a unused function, which has been commented. In order to get a clean code, these two lines should be removed. Everything else is perfect.
k in dict.keys() will create a temporary list to contains the keys. That will be more and more expensive when dict gets large. Just replace "k in dict.keys()" with "k in dict", which will save both space and time.
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