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Merge pull request kodecocodes#103 from aliHafizji/counting_sort
Add counting sort
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‎Counting Sort/CountingSort.playground/Contents.swift

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//: Playground - noun: a place where people can play
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import UIKit
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import Foundation
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enum CountingSortError: ErrorType {
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case ArrayEmpty
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}
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func countingSort(array: [Int]) throws-> Array<Int> {
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guard array.count > 0 else {
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throw CountingSortError.ArrayEmpty
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}
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// Step 1:
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// Create an array to store the count of each element
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let maxElement = array.maxElement() ?? 0
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var countArray = [Int](count: Int(maxElement + 1), repeatedValue: 0)
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for element in array {
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countArray[element] += 1
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}
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// Step 2
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// Set each value to be the sum of the previous two values
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for index in 1 ..< countArray.count {
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let sum = countArray[index] + countArray[index-1]
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countArray[index] = sum
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}
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// Step 3
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// Place the element in the final array as per the number of elements before it
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var sortedArray = [Int](count: array.count, repeatedValue: 0)
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for element in array {
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countArray[element] = countArray[element] - 1
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sortedArray[countArray[element]] = element
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}
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return sortedArray
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}
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try countingSort([10, 9, 8, 7, 1, 2, 3, 4, 5])

‎Counting Sort/CountingSort.playground/contents.xcplayground

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<playground version='5.0' target-platform='ios'>
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<timeline fileName='timeline.xctimeline'/>
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</playground>

‎Counting Sort/CountingSort/CountingSort.swift

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//
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// Sort.swift
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// test
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//
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// Created by Kauserali on 11/04/16.
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// Copyright © 2016 Ali Hafizji. All rights reserved.
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//
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import Foundation
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enum CountingSortError: ErrorType {
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case ArrayEmpty
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}
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func countingSort(array: [Int]) throws-> Array<Int> {
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guard array.count > 0 else {
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throw CountingSortError.ArrayEmpty
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}
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// Step 1:
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// Create an array to store the count of each element
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let maxElement = array.maxElement() ?? 0
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var countArray = [Int](count: Int(maxElement + 1), repeatedValue: 0)
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for element in array {
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countArray[element] += 1
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}
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// Step 2
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// Set each value to be the sum of the previous two values
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for index in 1 ..< countArray.count {
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let sum = countArray[index] + countArray[index-1]
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countArray[index] = sum
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}
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// Step 3
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// Place the element in the final array as per the number of elements before it
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var sortedArray = [Int](count: array.count, repeatedValue: 0)
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for element in array {
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countArray[element] = countArray[element] - 1
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sortedArray[countArray[element]] = element
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}
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return sortedArray
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}

‎Counting Sort/CountingSort/CountingSort.xcodeproj/project.pbxproj

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‎Counting Sort/CountingSort/CountingSort/CountingSortTest.swift

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//
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// CountingSort.swift
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// CountingSort
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//
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// Created by Kauserali on 11/04/16.
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//
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//
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import XCTest
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class CountingSort: XCTestCase {
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func testCountingSort() {
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let sequence = [10, 8, 1, 2, 5, 8]
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let sortedSequence = [1, 2, 5, 8, 8, 10]
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do {
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let afterCountingSort = try countingSort(sequence)
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XCTAssertEqual(afterCountingSort, sortedSequence)
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} catch {
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XCTFail("")
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}
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}
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}

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