input = 123456789, output = 1+2+3+4+5+6+7+8+9 = 45
Does the size of the solution include the size of functions that have been called?
Find the sum of all the numbers of the input vector
So many choices
Project Euler: Problem 7, Nth prime
Find the sum of the elements in the "second" diagonal
Change the first and last diagonal element of the identity matrix to zero
determine the sum of the squares
No more zeros
concatenate the elements
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