Given an input variable x, output a variable y that is equal in value to x.
Input x = 1
Output y is 1
Input x = 5
Output y is 5
Not as simple as it seems.
Back and Forth Rows
Find relatively common elements in matrix rows
Given a window, how many subsets of a vector sum positive
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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