Implementing Selection Sort

Implementing Selection Sort

Introduction

This tutorial will guide you through implementing the selection sort algorithm to sort an array of numbers.

Step 1: Define the Problem

We are given an array of numbers and we need to sort it in ascending order.

Step 2: Initialize the Outer Loop

We will initialize an outer loop that iterates through the array.

Step 3: Initialize the Inner Loop

We will initialize an inner loop that iterates through the unsorted portion of the array.

Step 4: Find the Minimum Element

We will find the minimum element in the unsorted portion of the array.

Step 5: Swap the Minimum Element with the First Element of the Unsorted Portion

We will swap the minimum element with the first element of the unsorted portion.

Step 6: Repeat Steps 3, 4, and 5 Until the Array is Sorted

We will repeat steps 3, 4, and 5 until the array is sorted.

Example Code

def selection_sort(array):
    for i in range(len(array)):
        min_index = i
        for j in range(i+1, len(array)):
            if array[j] < array[min_index]:
                min_index = j
        array[i], array[min_index] = array[min_index], array[i]
    return array
print(selection_sort([64, 34, 25, 12, 22, 11, 90]))  # Output: [11, 12, 22, 25, 34, 64, 90]

Conclusion

In this tutorial, we learned how to implement the selection sort algorithm to sort an array of numbers.