update OrderedListSorter
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now it work with all comparable type
This commit is contained in:
Raffaele Mignone 2019-04-12 21:57:14 +02:00
parent 471b0413cc
commit a9bd9df609
Signed by: norangebit
GPG Key ID: F5255658CB220573
2 changed files with 60 additions and 4 deletions

View File

@ -25,8 +25,10 @@
package it.norangeb.algorithms.exercises
import it.norangeb.algorithms.datastructures.queue.priority.BinaryHeap
object OrderedListSorter {
fun sort(vararg lists: List<Int>): List<Int> {
fun sortUnsignedInt(vararg lists: List<Int>): List<Int> {
val bias = lists.map { it.first() }.sorted().first()
val upperBound = lists.map { it.last() }.sorted().last()
val bucket = Array(upperBound - bias + 1) { 0 }
@ -55,4 +57,28 @@ object OrderedListSorter {
return (outList as Array<Int>).toList()
}
fun <T : Comparable<T>> sort(vararg lists: List<T>): List<T> {
val heap = BinaryHeap.createMinPriorityQueue<Node<T>, T> { it.value }
lists.forEachIndexed { index, list ->
heap.insert(Node(list.first(), index, 0))
}
val outList = ArrayList<T>()
while (!heap.isEmpty()) {
heap.pop().map {
outList.add(it.value)
val k = it.k
val n = it.n + 1
if (lists[k].size > n)
heap.insert(Node(lists[k][n], k, n))
}
}
return outList
}
data class Node<T>(val value: T, val k: Int, val n: Int)
}

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@ -26,22 +26,52 @@
package it.norangeb.algorithms.exercises
import org.amshove.kluent.`should equal`
import org.junit.Before
import org.junit.Test
class OrderedListSorterTest {
@Test
fun test() {
val out = OrderedListSorter.sort(
lateinit var lists: List<List<Int>>
@Before
fun init() {
lists = listOf(
listOf(1, 5, 9, 10, 12, 14, 15, 15, 20, 25, 29, 31, 35, 37, 43, 48),
listOf(2, 7, 12, 21, 23, 33, 35, 43, 45),
listOf(3, 7, 9, 12, 14, 16, 27, 28, 37, 39, 45, 45, 46, 50),
listOf(1, 8, 9, 11, 13, 21, 25, 33, 34, 41, 47, 48)
)
}
@Test
fun testSortUnsignedInt() {
val out = OrderedListSorter.sortUnsignedInt(*lists.toTypedArray())
out `should equal` listOf(1, 1, 2, 3, 5, 7, 7, 8, 9, 9, 9, 10, 11, 12,
12, 12, 13, 14, 14, 15, 15, 16, 20, 21, 21, 23, 25, 25, 27, 28, 29,
31, 33, 33, 34, 35, 35, 37, 37, 39, 41, 43, 43, 45, 45, 45, 46, 47,
48, 48, 50)
}
@Test
fun testSortInt() {
val out = OrderedListSorter.sort(*lists.toTypedArray())
out `should equal` listOf(1, 1, 2, 3, 5, 7, 7, 8, 9, 9, 9, 10, 11, 12,
12, 12, 13, 14, 14, 15, 15, 16, 20, 21, 21, 23, 25, 25, 27, 28, 29,
31, 33, 33, 34, 35, 35, 37, 37, 39, 41, 43, 43, 45, 45, 45, 46, 47,
48, 48, 50)
}
@Test
fun testSortStrings() {
val out = OrderedListSorter.sort(
listOf("AAA", "BCE", "BCZ", "DCC", "DDD", "EEE"),
listOf("AAB", "AAC", "BBB", "DZZ", "EAA", "EAB"),
listOf("CCC", "CCZ", "DAA", "DDD")
)
out `should equal` listOf("AAA", "AAB", "AAC", "BBB", "BCE", "BCZ", "CCC", "CCZ", "DAA",
"DCC", "DDD", "DDD", "DZZ", "EAA", "EAB", "EEE")
}
}