add OrderedListSorter

now it work only with non negative integer list

src/main/kotlin/it/norangeb/algorithms/exercises/OrderedListSorter.kt

@@ -0,0 +1,58 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 norangebit
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+package it.norangeb.algorithms.exercises
+
+object OrderedListSorter {
+    fun sort(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 }
+
+        lists.forEach {
+            it.forEach {
+                bucket[it - bias] += 1
+            }
+        }
+
+        bucket.forEachIndexed { index, _ ->
+            if (index == 0)
+                return@forEachIndexed
+
+            bucket[index] += bucket[index - 1]
+        }
+
+        val outList = arrayOfNulls<Int>(bucket[upperBound - bias])
+
+        lists.forEach {
+            it.forEach {
+                outList[bucket[it - bias] - 1] = it
+                bucket[it - bias] -= 1
+            }
+        }
+
+        return (outList as Array<Int>).toList()
+    }
+}

src/test/kotlin/it/norangeb/algorithms/exercises/OrderedListSorterTest.kt

@@ -0,0 +1,47 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 norangebit
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+package it.norangeb.algorithms.exercises
+
+import org.amshove.kluent.`should equal`
+import org.junit.Test
+
+class OrderedListSorterTest {
+
+    @Test
+    fun test() {
+        val out = OrderedListSorter.sort(
+            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)
+        )
+
+        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)
+    }
+}