Maintainable means it is easy to understand, sensibly organized, it is painless to make modifications that should be expected (client wants to add another type of report), and as easy as possible to make changes that aren't (client wants a totally new feature)
Efficient means the code uses as few resources as possible to accomplish its job, so that it is as fast and scalable as possible.
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Maintainable and efficient.
Maintainable means it is easy to understand, sensibly organized, it is painless to make modifications that should be expected (client wants to add another type of report), and as easy as possible to make changes that aren't (client wants a totally new feature)
Efficient means the code uses as few resources as possible to accomplish its job, so that it is as fast and scalable as possible.