This video is a part of a full algorithm series: [ Ссылка ]

In this one we'll cover the insertion sort algorithm.

The insertion sort algorithm breaks a list into two sublists, one with sorted values and the other with unsorted values. We move one unsorted value to the sorted sublist, and compare its value to the values to the left. We move it into the correct position by switching, each time the item to the left is larger.

#InsertionSort #Python #Algorithm

One we have sorted the element, we start the next iteration and sort the next unsorted item in the unsorted sublist.

The Insertion sort algorithm has a complexity of O(n^2) because we're still doing comparisons with two nested lists. However, this one is preferable to the bubble and selection sort algorithms. We take the "best" parts of both of those and combine them to insertion sort.

If you need more of an idea on how we use the Insertion Sort Algorithm, think of how we organize hands of playing cards. When we draw a new card into our hand, we place it in the front, find the position that it would go to within the hand, and then draw the next. The Insertion Sort Algorithm is attempting to do the same thing.

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Full code from the video:

def insertion_sort(list_a):
indexing_length = range(1, len(list_a))
for i in indexing_length:
value_to_sort = list_a[i]

while list_a[i-1] (greater than) value_to_sort and i(greater than)0:
list_a[i], list_a[i-1] = list_a[i-1], list_a[i]
i = i -1
#Sorry - Youtube doesn't allow angled brackets in the description :(

return list_a


print(insertion_sort([7,8,9,8,7,6,5,6,7,8,9,8,7,6,5,6,7,8]))

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Packages (& Versions) used in this video:
Python 3.7
Atom Text Editor

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