Given the handle to a binary function that takes two ordinary numbers, test if the function is commutative.
Multiply a column by a row
Set the array elements whose value is 13 to 0
Sum the entries of each column of a matrix which satisfy a logical condition.
Acid and water
Given an unsigned integer x, find the largest y by rearranging the bits in x
Tell me the slope
given 3 sides, find area of this triangle
area of an annulus
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