if x = 4, the solution will be: y = 1^2+2^2+3^2+4^2=1+4+9+16 = 30.
Given an unsigned integer x, find the largest y by rearranging the bits in x
Sum of diagonals elements of a matrix
Area of a disk
Determine the length of a string of characters
Multiply by 3
sum all digits
No more zeros
concatenate the elements
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