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I think. If there are k arrays of different lengths (l1,l2...lk) then best case complexcity can not be less than O(l1*l2...lk), because we need to generate all at least such results. lets say if we have 3 char arrays of size 2,3,4 then result should contain 2*3*4=24 strings. so here we can use bottom to top approach. algo should be:
- talk2arpit March 01, 20131- mutliply k & k-1 char arrays
2- multiply results of step 1 to k-2
3-and so on till k=1.
As per our example. k= 3, l1= 2, l2=3;l3 =4
l3(3)*l(4)
\ /
l(12)*l(2)
\ /
l(24)