check whether these steps work:

step 1:
        sort the given numbers in the decreasing order based on their first 
digit.
step 2:
        if two numbers come out to be equal in the above case & both of 
their next digit exist then sort on the basis of their next digit, otherwise 
the number
        whose next digit doesnot exist should be placed before the other 
number.
step 3:
       concatenate these numbers.

e.g.

(0,1,10,100) sorting it gives: 1,10,100,0 => 1101000
(97,8,9) sorting gives: 9,97,8 => 9978

correct me if i'm wrong.

Shubham

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