diff --git a/Sorts/BinaryInsertionSort.js b/Sorts/BinaryInsertionSort.js new file mode 100644 index 0000000000..3326404e40 --- /dev/null +++ b/Sorts/BinaryInsertionSort.js @@ -0,0 +1,60 @@ +/** + * Pure Implementation of Binary Search Algorithm + * + * Binary insertion sort is a sorting algorithm similar to insertion sort, + * but instead of using linear search to find the position + * where the element should be inserted, we use binary search. + * Thus, we reduce the number of comparisons for inserting one element from O(N) + * (Time complexity in Insertion Sort) to O(log N). + * + */ + +/** + * Search the key element in the array from start position to end position. + * + * @param {Array} array Array of numbers. + * @param {Number} key Value to be searched + * @param {Number} start start index position of array + * @param {Number} end end index position of array + * @return {Number} Position of the key element + */ +function binarySearch (array, key, start, end) { + if (start === end) { + if (array[start] > key) { + return start + } else { + return start + 1 + } + } + + if (start > end) { + return start + } + + const mid = Math.floor((start + end) / 2) + + if (array[mid] < key) { + return binarySearch(array, key, mid + 1, end) + } else if (array[mid] > key) { + return binarySearch(array, key, start, mid - 1) + } else { + return mid + } +} + +/** + * Binary Insertion Sort + * + * @param {Array} list List to be sorted. + * @return {Array} The sorted list. + */ +export function binaryInsertionSort (array) { + const totalLength = array.length + for (let i = 1; i < totalLength; i += 1) { + const key = array[i] + const indexPosition = binarySearch(array, key, 0, i - 1) + array.splice(i, 1) + array.splice(indexPosition, 0, key) + } + return array +} diff --git a/Sorts/test/BinaryInsertionSort.test.js b/Sorts/test/BinaryInsertionSort.test.js new file mode 100644 index 0000000000..84abe6a7ce --- /dev/null +++ b/Sorts/test/BinaryInsertionSort.test.js @@ -0,0 +1,8 @@ +import { binaryInsertionSort } from '../BinaryInsertionSort' + +describe('BinaryInsertionSort', () => { + it('should sort arrays correctly', () => { + expect(binaryInsertionSort([5, 4, 3, 2, 1])).toEqual([1, 2, 3, 4, 5]) + expect(binaryInsertionSort([7, 9, 4, 3, 5])).toEqual([3, 4, 5, 7, 9]) + }) +})
Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
Alternative Proxies: