logo CodeStepByStep logo


Language/Type: C# HashSet SortedSet collections
Related Links:

Write a method named Twice that accepts as a parameter a list of integers and returns a SortedSet containing all the numbers in the list that appear exactly twice. For example, if a list variable v stores {1, 3, 1, 4, 3, 7, -2, 0, 7, -2, -2, 1}, the call of Twice(v) should return the set {3, 7}.

If you want an extra challenge: Use only sets as auxiliary storage.

Method: Write a C# method as described, not a complete program or class.

You must log in before you can solve this problem.

Log In

Need help?

Stuck on an exercise? Contact your TA or instructor.

If something seems wrong with our site, please

Is there a problem? Contact us.