Lesson 26 of 47
In Progress

# Tim Sort

##### Yasin Cakal

Timsort is an efficient, adaptive sorting algorithm that is used in Python and other programming languages. It was created by Tim Peters in 2002 and is based on the merge sort and insertion sort algorithms. Timsort is a hybrid algorithm which combines both divide-and-conquer and insertion sorting methods. It is used to sort arrays of integers, objects, and other data types.

Timsort works by first dividing the data into subarrays, and then inserting the elements of each subarray into the larger array. The algorithm then performs an insertion sort on the data, which is a relatively simple sorting technique. Finally, the algorithm performs a merge sort on the data, which is a more complex sorting technique.

Timsort has an advantage over other sorting algorithms because it is adaptive. This means that it can adjust itself to the data it is sorting, allowing it to sort the data more quickly. For example, if the data is already sorted or nearly sorted, Timsort can make adjustments to the algorithm to improve the performance.

## How Timsort Works

Timsort is an efficient sorting algorithm that works by combining the divide-and-conquer and insertion sorting methods. The algorithm divides the data into subarrays, which are then inserted into the larger array. The algorithm then performs an insertion sort on the data, and finally a merge sort.

The first step of Timsort is to divide the data into subarrays. This is done by comparing each element of the data to the element immediately before it. If the elements are not in the correct order, the algorithm will divide the data at this point. This process continues until all elements are in the correct order.

Once the data is divided into subarrays, the algorithm will perform an insertion sort on each subarray. An insertion sort is a simple sorting technique which works by inserting each element into its correct position in the array. This is a relatively fast process since the elements of the array are already sorted.

The final step of Timsort is to perform a merge sort on the data. A merge sort is a more complex sorting technique which works by combining two sorted subarrays into one larger sorted array. This is a slower process than insertion sort, but it is necessary to ensure the data is completely sorted.

## Time Complexity

Timsort is an efficient sorting algorithm which has a time complexity of O(n log n). This means that the algorithm takes approximately n log n time to sort n elements. The time complexity of Timsort is the same as that of merge sort and insertion sort, and is better than that of other sorting algorithms such as bubble sort and selection sort.

The best case time complexity of Timsort is O(n), which means that the algorithm takes only n time to sort n elements. This occurs when the data is already sorted or nearly sorted, as the algorithm can make adjustments to the algorithm to improve the performance.

The average case time complexity of Timsort is O(n log n). This means that the algorithm takes approximately n log n time to sort n elements. This is the same as the time complexity of merge sort and insertion sort, and is better than that of other sorting algorithms such as bubble sort and selection sort.

The worst case time complexity of Timsort is also O(n log n). This means that the algorithm takes approximately n log n time to sort n elements. This is the same as the time complexity of merge sort and insertion sort, and is better than that of other sorting algorithms such as bubble sort and selection sort.

## Space Complexity

The space complexity of Timsort is O(n). This means that the algorithm takes up n space to sort n elements. This is the same as the space complexity of merge sort and insertion sort, and is better than that of other sorting algorithms such as bubble sort and selection sort.

The worst case space complexity of Timsort is also O(n). This means that the algorithm takes up n space to sort n elements. This is the same as the space complexity of merge sort and insertion sort, and is better than that of other sorting algorithms such as bubble sort and selection sort.

## Python Code for Timsort

Timsort is an efficient sorting algorithm which can be implemented in Python. The following code shows a Python implementation of the Timsort algorithm:

def timsort(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
arr[j], arr[j+1] = arr[j+1], arr[j]
j -= 1
# Perform merge sort on the array
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] <= arr[k]:
j += 1
else:
temp = arr[k]
arr[k], arr[j] = arr[j], temp
k += 1
mid = i
return arr

## Conclusion

Timsort is an efficient sorting algorithm that is used in Python and other programming languages. It is a hybrid algorithm which combines both divide-and-conquer and insertion sorting methods. Timsort has an advantage over other sorting algorithms because it is adaptive, which means it can adjust itself to the data it is sorting, allowing it to sort the data more quickly. The time complexity of Timsort is O(n log n), and the space complexity is O(n).

## Exercises

#### Write a function timsort_test which takes an array of integers as an argument and returns True if the array is sorted using Timsort, and False otherwise.

def timsort_test(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
return False
# Perform merge sort on the array
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] > arr[k]:
return False
mid = i
return True

#### Write a function timsort which takes an array of integers as an argument and returns the array sorted using Timsort.

def timsort(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
arr[j], arr[j+1] = arr[j+1], arr[j]
j -= 1
# Perform merge sort on the array
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] <= arr[k]:
j += 1
else:
temp = arr[k]
arr[k], arr[j] = arr[j], temp
k += 1
mid = i
return arr

#### Write a function timsort_avg_time which takes an array of integers as an argument and returns the average time complexity of Timsort.

def timsort_avg_time(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
ins_time = 0
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
ins_time += 1
j -= 1
# Perform merge sort on the array
merge_time = 0
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] <= arr[k]:
merge_time += 1
j += 1
else:
merge_time += 1
k += 1
mid = i
avg_time = (ins_time + merge_time) / 2
return avg_time

#### Write a function timsort_time_complexity which takes an array of integers as an argument and returns the time complexity of Timsort.

def timsort_time_complexity(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
ins_time = 0
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
ins_time += 1
j -= 1
# Perform merge sort on the array
merge_time = 0
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] <= arr[k]:
merge_time += 1
j += 1
else:
merge_time += 1
k += 1
mid = i
time_complexity = max(ins_time, merge_time)
return time_complexity

#### Write a function timsort_space_complexity which takes an array of integers as an argument and returns the space complexity of Timsort.

def timsort_space_complexity(arr):
n = len(arr)
# Divide the array into subarrays
for i in range(0, n-1):
if arr[i] > arr[i+1]:
mid = i
break
# Perform insertion sort on each subarray
ins_space = 0
for i in range(0, mid+1):
j = i
while (arr[j] > arr[j+1]) and (j >= 0):
ins_space += 1
j -= 1
# Perform merge sort on the array
merge_space = 0
while mid < n-1:
i = mid + 1
while i < n and arr[i-1] <= arr[i]:
i += 1
j = mid + 1
k = i
while j < k and k < n:
if arr[j] <= arr[k]:
merge_space += 1
j += 1
else:
merge_space += 1
k += 1
mid = i
space_complexity = max(ins_space, merge_space)
return space_complexity