The selection sort is the sorting algorithm that finds the smallest element in the array and exchanges the element with the first position, then find the second smallest element and exchange it with the element in the second position and continues the process till the entire array is sorted. The insertion sort is the sorting algorithm that sorts the array by shifting elements one by one. It is the sorted array using selection sort algorithm. The element 66 is swapped with the 4 th index element. The elements 11,22,33,44 are already sorted. It is swapped with the 3 rd index element.
The elements 11,22 and 33 are already sorted. It is swapped with the 2 nd index element. The elements 11 and 22 are already sorted. It is swapped with the 1 st index element. From the rest of elements, the smallest is 22. The smallest element is in the index 0, so 11 is now sorted. It is swapped with the element in the 0 index of the array. In this sorting algorithm, the smallest in the array is found. The selection sort algorithm can be explained using the following example.įor example, take the initial array as 77,33, 44,11,88,22. This process continues moving unsorted array boundary from one element to the right. Then it is swapped with the left element. First, the smallest value should be found. Selection sort is an in-place comparison-based sorting algorithm.
Incrementing the index will make the index to 4. 11 is less than 33, so those two values are swapped. When comparing 11 and 44, 11 is less than 44. 11 is less than 77, so those two are swapped. It is compared with all elements in the left. The index is 3, and the current element is 11. So those elements do not need to be exchanged.Īgain, the index is incremented. It is necessary to compare all elements on the left. It is compared with the elements in the left side. The index is 2, and the current element is 44. Now 33 is in index 0, and 77 is in index1.Īgain, the index is incremented. When comparing it with the element in the left, it is smaller than 77. Now the index is 1, and the current element is 33. Then the index of the current position is incremented by 1. The 77, is the first element and there are no elements on the left side. The current element is compared with all elements in the left-hand side. In this sorting algorithm, the first step is to select the current element. The insertion sort algorithm can be explained using the following example.įor example, take the initial array as 77,33, 44,11,88. The unsorted items are moved and inserted into the sorted sublist of the array. In this method, the array is searched step by step. Insertion sort is an in-place comparison-based sorting algorithm. Side by Side Comparison – Insertion Sort vs Selection Sort in Tabular Form Similarities Between Insertion Sort and Selection Sortĥ. The key difference between the insertion sort and selection sort is that insertion sort compares two elements at a time while the selection sort selects the minimum element from the whole array and sorts it. Two such algorithms are insertion sort and selection sort. In Computer Science, there are sorting algorithms to sort a collection of data. Therefore, sorting is useful in daily life. In the same way, if the words in the dictionary are not arranged in the alphabetical order, it would be very hard to find words. If the phone numbers in a telephone directory are not in a sorted manner, then it would be hard to find a specific telephone number. If the data is sorted properly, then it would be easy to search data faster. In sorting, the data is arranged according to a numerical or a lexicographical order. Sorting algorithms are mechanisms to sort a set of data. Sometimes it is necessary to arrange data in a specific order. Insertion sort and selection sort are two sorting algorithms used to sort a collection of data. Key Difference – Insertion Sort vs Selection Sort
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