alt Hacker NewsMore seriously,
> You need a way to differentiate the two 5s
As there's no unique filtering or other reduction going on here, there's a permutation chain from input to output.
More seriously,
> You need a way to differentiate the two 5s
As there's no unique filtering or other reduction going on here, there's a permutation chain from input to output.
But that's not in the specification given above. That specification is entirely wrong to specify SORT. It requires no duplicates survive the sorting process.