diff --git a/algorithms/sorting/tim_sort.py b/algorithms/sorting/tim_sort.py new file mode 100644 index 0000000..993c07e --- /dev/null +++ b/algorithms/sorting/tim_sort.py @@ -0,0 +1,90 @@ +from random import randint + + +class TimSort: + """ A class to demonstrate Tim Sort """ + + def __init__(self, array): + self.array = array + self.arrayLength = len(array) + self.__RUN = 32 + + def insertionSort(self, arr): + """ Sorts the given array from given starting index to ending index """ + + for i in range(1, len(arr)): + currentElement = arr[i] + j = i - 1 + while j >= 0 and arr[j] > currentElement: + arr[j + 1] = arr[j] + j -= 1 + arr[j + 1] = currentElement + + return arr + + def mergeRuns(self, arr1, arr2): + """ Merges the given two arrays: arr1 and arr2 """ + + newArray = list() + lengthOfArr1 = len(arr1) + lengthOfArr2 = len(arr2) + + # The variable i is used to keep track of the indices of the first array + # The variable j is used to keep track of the indices of the second array + # The variable k is used to keep track of the indices of the newArray array which is to be returned + i, j, k = 0, 0, 0 + + while i < lengthOfArr1 and j < lengthOfArr2: + if arr1[i] <= arr2[j]: + newArray[k] = arr1[i] + k += 1 + i += 1 + elif arr1[i] >= arr2[j]: + newArray[k] = arr2[j] + k += 1 + j += 1 + + # The below two loops will append any remaining elements left in any of the two arrays. + while i < lengthOfArr1: + newArray.append(arr1[i]) + i += 1 + + while j < lengthOfArr2: + newArray.append(arr2[j]) + j += 1 + + return newArray + + def changeRun(self, newRun): + self.__RUN = newRun + + def algorithm(self): + """ This function will perfom Tim Sort on the given array """ + + # Breaking the array into chunks of subarray(RUNS) of size RUN and perfomring insertionSort on them. + for i in range(0, self.arrayLength, self.__RUN): + currentRunElements = self.array[i: i + self.__RUN] + + self.array[i: i + + self.__RUN] = self.insertionSort(currentRunElements) + + temp_runner = self.__RUN + while temp_runner < self.arrayLength: + for idx in range(0, self.arrayLength, temp_runner * 2): + firstArray = self.array[idx: idx + temp_runner] + secondArray = self.array[idx + + temp_runner: idx + temp_runner * 2] + self.array[idx: idx + temp_runner * + 2] = self.mergeRuns(firstArray, secondArray) + temp_runner = self.__RUN * 2 + + print(f"The sorted array is : {self.array}") + + def __repr__(self): + return f"Array: {self.array}\nRUN: {self.__RUN}" + + +myArray = [randint(1, 100) for i in range(15)] +demo = TimSort(myArray) +print(demo) +demo.algorithm() pFad - Phonifier reborn

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