PYTHON:fastest(cause without whiles)&shortest(only 2 lines:1def + 1 return with processing):
\nclass Solution:\n    def minimumCost(self, n: List[int]) -> int:\n        def g(a,d):return[l:=len(s:=str(a)),z:=[9,int((b:=str(q:=int(s[:(l+1)//2])+d))+b[:l/
```\nclass Solution:\n    def minimumCost(self, n: List[int]) -> int:\n        def g(a,d):return[l:=len(s:=str(a)),z:=[9,int((b:=str(q:=int(s[:(l+1)//2])+d))+b[:l//2][::-1])][q>0],o.append(sum(abs(v-z)for v in n))][1]\n        return min([o:=[],g(b:=g(a:=median_low(n),0),[-1,1][b<a])][0])\n```
['Python3']