I need an algorithmic help to convert an input Array object to ArrayList<List> object? [closed]

I need an algorithmic help to convert an input array in Java having this content : {5,6,3,2,4,7} To this format : [[2, 3], [3, 4], [4, 5], [5, 6], [6, 7]].

Ambiguity in a CodeForces Problem – usage of HashSet Vs LinkedHashSet

I was solving a Codeforces problem yesterday. The problem’s URL is this I will just explain the question in short below. Given a binary string, divide it into a minimum number of subsequences in such …

Power set of an input set as custom collection

I have been reading the Effective Java book and I have stuck with this code I am unable to understand how this code is generating power set. Code: public class PowerSet { public static final <...

Good way to get *any* value from a Java Set?

Given a simple Set, what is a good way (fast, few lines of code) to get any value from the Set? With a List, it’s easy: List things = …; return things.get(0); But, with a Set, …

Iteratively compute the Cartesian product of an arbitrary number of sets

I want to compute the cartesian product of an arbitrary number of nonempty sets in Java. I’ve wrote that iterative code… public static List<Set> cartesianProduct(List<…