How to set it in a lexicographical order?

#1
#2

@Ashish940
Sorting your generated permutations is easy. Create a vector of strings in global scope.
vector < string > v ;
Instead of printing the permutations in Line No. 6 , push them into this vector.
In the main( ) , after all your recursive calls are done , you have vector v ready with all your permutations.
Call sort( ) of < algorithm > on this vector.
sort( v.begin() , v.end() ) ;
Now just simply print the contents of this vector using a loop.

#3

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