The numbers are not limited from -32768 to 32767,but in the range
that could been expressed by:
long long or even more-10......0.
What is the best algorithm!
And how do it if there are more than two lists of numbers!

if range is more than int and I have O(n^(L/2)) memory
then it is O(n^(L/2) log n)
(L = number of lists, n = number of numbers in each list)
but if I have just O(n) memory, I think it should be O(n^(L-1) log n)
Do you think so?