Given an unsigned integer x, find the largest y by rearranging the bits in x.
Input x = 10
Output y is 12
since 10 in binary is 1010 and 12 in binary is 1100.
DecimalToBinaryVector is regarded as undefined function ???
That's right, because there is no such thing. These are named something else.
how to improve this size to 10?
0 < 1 -> sort('10') -> '01'
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