Whats wrong with this solution

#1
#2

@niketagarwal10 simply sorting wont work because the strings with smaller length are placed before the strings which are longer. so your code will fail in a case for eg where 9009 and 90 are present. The sorted order will be 909009 and so you will print the reverse order 900990 but a bigger number is possible.
You can use the custom sort function to see if s1 + s2 is bigger or s2 + s1 and sort accordingly.

#3

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