Python – Sort by range inclusion

Given a range, sort tuple Matrix by total range covered in a given range. [Considering tuples which completely lie within range].

Input : test_list = [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]], i, j = 2, 15 
Output : [[(3, 16)], [(1, 5), (6, 10), (10, 15)], [(1, 3), (9, 13)], [(2, 4), (6, 8), (9, 14)]] 
Explanation : 0 < 4 < 4 < 9, is the magnitude of range covered in tuples lists.

Input : test_list = [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)]], i, j = 2, 15 
Output : [[(3, 16)], [(1, 5), (6, 10), (10, 15)], [(2, 4), (6, 8), (9, 14)]] 
Explanation : 0 < 4 < 9, is the magnitude of range covered in tuples lists. 

Method #1 : Using sort() + sum()

In this, inplace sorting is performed using sort(), and summation of ranges in the given range is performed using sum() and list comprehension with conditions.

Python3

# Python3 code to demonstrate working of
# Sort by range inclusion
# Using sort() + sum()


def range_sum(row):

    # summing in range element
    return sum([abs(sub[1] - sub[0]) for sub in row if sub[0] > i and sub[0] < j and sub[1] > i and sub[1] < j])


# initializing list
test_list = [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [
    (2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]]

# printing original list
print("The original list is : " + str(test_list))

# initializing range
i, j = 2, 15

# inplace sorting using sort()
test_list.sort(key=range_sum)

# printing result
print("Sorted List : " + str(test_list))

Output:

The original list is : [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]] Sorted List : [[(3, 16)], [(1, 5), (6, 10), (10, 15)], [(1, 3), (9, 13)], [(2, 4), (6, 8), (9, 14)]]

Time Complexity: O(nlogn)
Auxiliary Space: O(1)

Method #2 : Using sorted() + lambda + sum()

In this, we perform task of sorting using sorted() and utility injection using lambda function, the summation is performed using sum().

Python3

# Python3 code to demonstrate working of
# Sort by range inclusion
# Using sorted() + lambda + sum()

# initializing list
test_list = [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [
    (2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]]

# printing original list
print("The original list is : " + str(test_list))

# initializing range
i, j = 2, 15

# sorting using sorted() + lambda
res = sorted(test_list, key=lambda row: sum(
    [abs(sub[1] - sub[0]) for sub in row if sub[0] > i and sub[0] < j and sub[1] > i and sub[1] < j]))

# printing result
print("Sorted List : " + str(res))

Output:

The original list is : [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]] Sorted List : [[(3, 16)], [(1, 5), (6, 10), (10, 15)], [(1, 3), (9, 13)], [(2, 4), (6, 8), (9, 14)]]

Time Complexity: O(n*logn), where n is the length of the input list. This is because we’re using the built-in sorted() function which has a time complexity of O(nlogn) in the worst case.
Auxiliary Space: O(1), as we’re not using any additional space other than the input list itself.

METHOD 3:Using filter() function and Sorting

APPROACH:

we use the filter() function to create a new list based on the range inclusion of each sublist. Then we sort the sublists based on their range inclusion.

ALGORITHM:

1.Start by defining the input variables test_list, i, and j.
2.Use the filter() function to iterate through each tuple in the test_list and check if any of the values in the tuple fall within the range [i,j].
3.Use the sorted() function to sort the filtered list by whether each tuple contains a value within the range [i,j]. Sort the list in reverse order so that tuples that contain values within the range [i,j] are first.
4.Print the sorted list.

Python3

test_list = [[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]]
i, j = 2, 15

filtered_list = list(filter(lambda x: any(i <= a <= j or i <= b <= j for a, b in x), test_list))
sorted_list = sorted(filtered_list, key=lambda x: any(i <= a <= j or i <= b <= j for a, b in x), reverse=True)

print(sorted_list)

Output

[[(1, 5), (6, 10), (10, 15)], [(3, 16)], [(2, 4), (6, 8), (9, 14)], [(1, 3), (9, 13)]]

Time Complexity: O(N*log(N)), where N is the number of sublists.
Space Complexity: O(N), where N is the number of sublists.