although i am getting the output, its not sorted in the correct way. can you tell me how is that supposed to be done. do i need to store the outputs and then sort them ?
INCORRECT ANSWER
you can sort the output by making custom comparator, your logic is correct but you are starting from back of the n so you just need to start recurring from the front , since you have taken n as int so computing front digit is little complex which we can ease by taking n as a string
refer code for more clearity
In case of any doubt feel free to ask 
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