Why is it wrong

#1

i have done accordingly correctplz check it

#2

hello @raohemad
you need to define custom comparator to solve this problem.
default comparator will fail.
for example -> for input 2 21
default comparator will order them as 212 but correct order is 221.

so define ur own comparator for comparision

#3

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#4

ok i will give feedback the doubt got resolved