From 6c1bb2bc60fd6a8e7e3691799c233b43baf64251 Mon Sep 17 00:00:00 2001 From: norangebit Date: Thu, 2 May 2019 22:00:05 +0200 Subject: [PATCH] add exercise kmin - update kluent --- buildSrc/src/main/java/Config.kt | 2 +- .../it/norangeb/algorithms/exercises/KMin.kt | 51 +++++++++++++++++ .../norangeb/algorithms/exercises/KMinTest.kt | 56 +++++++++++++++++++ 3 files changed, 108 insertions(+), 1 deletion(-) create mode 100644 src/main/kotlin/it/norangeb/algorithms/exercises/KMin.kt create mode 100644 src/test/kotlin/it/norangeb/algorithms/exercises/KMinTest.kt diff --git a/buildSrc/src/main/java/Config.kt b/buildSrc/src/main/java/Config.kt index e2e7e2e..fa733f7 100644 --- a/buildSrc/src/main/java/Config.kt +++ b/buildSrc/src/main/java/Config.kt @@ -26,7 +26,7 @@ object Config { object Versions { val arrow = "0.8.2" - val kluent = "1.48" + val kluent = "1.49" val koin = "1.0.2" val junit = "5.4.2" val spek = "2.0.1" diff --git a/src/main/kotlin/it/norangeb/algorithms/exercises/KMin.kt b/src/main/kotlin/it/norangeb/algorithms/exercises/KMin.kt new file mode 100644 index 0000000..e3cc1ef --- /dev/null +++ b/src/main/kotlin/it/norangeb/algorithms/exercises/KMin.kt @@ -0,0 +1,51 @@ +/* + * 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 arrow.core.None +import arrow.core.Option +import it.norangeb.algorithms.datastructures.queue.priority.BinaryHeap + +class KMin>(private val k: Int) { + private val heap = BinaryHeap.createMaxPriorityQueue() + + fun insert(elem: T): Option { + heap.peek().fold( + { heap.insert(elem) }, + { + if (elem < it || heap.size() < k) + heap.insert(elem) + }) + + if (heap.size() > k) + heap.pop() + + if (heap.size() < k) + return None + + return heap.peek() + } +} \ No newline at end of file diff --git a/src/test/kotlin/it/norangeb/algorithms/exercises/KMinTest.kt b/src/test/kotlin/it/norangeb/algorithms/exercises/KMinTest.kt new file mode 100644 index 0000000..b274de1 --- /dev/null +++ b/src/test/kotlin/it/norangeb/algorithms/exercises/KMinTest.kt @@ -0,0 +1,56 @@ +/* + * 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 arrow.core.None +import arrow.core.Some +import org.amshove.kluent.`should be` +import org.amshove.kluent.shouldEqual +import org.junit.jupiter.api.Test + +class KMinTest { + + @Test + fun test() { + val input = listOf(15, 17, 9, 12, 22, 4, 73, 87, 12, 5) + + val kmin = KMin(3) + val result = input.map { kmin.insert(it) } + + result shouldEqual listOf( + None, + None, + Some(17), + Some(15), + Some(15), + Some(12), + Some(12), + Some(12), + Some(12), + Some(9) + ) + } +} \ No newline at end of file