"cat" is a really nice touch for concatenation of those arrays! your solutions never fail my expectation.
by the way, i saw that "sub-func" comment...:)
Calling the two sub-functions the right way will not hurt your score. Great work though. :)
Test if a Number is a Palindrome without using any String Operations
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Number of 1s in a binary string
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Add a vector to a matrix
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