In the place of "Find the sum of all products whose...", I would say: "Find the number of all products whose..." ;-)
Why  instead of 0?
Since I have kludged a solution together, can I have a hint?
this solution works on my comupter
I see the first test command line is corrupted
:( :( :(
I've fixed that first line in the test suite. Try it again.
Extract leading non-zero digit
Counting in Finnish
Arrange vector in ascending order
Number of digits in an integer
The 5th Root
Find indices of diagonal elements
Find files with extension ext in the current directory
Find Missing Number
Find the path through the cell
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