HackerRank Python Solution - Itertools Topic - Compress the String!

• In this task, we would like for you to appreciate the usefulness of the groupby() function of itertools.

• You are given a string S. Suppose a character 'c' occurs consecutively X times in the string. Replace these consecutive occurrences of the character 'c' with (X,c) in the string.

• For a better understanding of the problem, check the explanation.

Input Format:

A single line of input consisting of the string S.

Output Format:

A single line of output consisting of the modified string.

Constraints:

• All the characters of S denote integers between 0 and 9.

• 1 <= |S| <= 10⁴

Sample Input:

1222311

Sample Output:

(1, 1) (3, 2) (1, 3) (2, 1)

Explanation:

First, character 1 occurs only once. It is replaced by (1, 1). Then the character 2 occurs three times, and it is replaced by (3, 2) and so on. Also, note the single space within each compression and between the compressions.

Solution:

from itertools import groupby

s = input()

print(*[(len(list(c)), int(k)) for k, c in groupby(s)])

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