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Add solution of list 7 - 246731 #58

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24 changes: 24 additions & 0 deletions List7.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
object List7 extends App {
def duplicate(list: LazyList[Int], reps: LazyList[Int]): LazyList[Int] = {
def containsDuplicate (list: LazyList[Int]): Boolean =
list match {
case LazyList() => false
case h #:: t => if (t.contains(h)) true else containsDuplicate(t)
}

def helper(l: LazyList[Int], r: LazyList[Int]): LazyList[Int] =
(l, r) match {
case (_, LazyList()) => LazyList()
case (LazyList(), _) => LazyList()
case (_ #:: t1, 0 #:: t2) => helper(t1, t2)
case (h1 #:: _, h2 #:: t2) => h1 #:: helper(l, (h2-1)#::t2)
}
if (containsDuplicate(list)) throw new Exception("List contains duplicates")
helper(list, reps)
}

println(duplicate(LazyList(1,2,3),LazyList(0,3,1,4)).force)
println(duplicate(LazyList(1,2,3),LazyList(0,3)).force)
println(duplicate(LazyList(1,2,3),LazyList(1,4)).force)
println(duplicate(LazyList(1,2,1,3),LazyList(0,3,1,4)).force)
}