Rearrange Spaces Between Words — LeetCode 1592 Python Solution

The problem

You are given a string text of words that are placed among some number of spaces. Each word consists of one or more lowercase English letters and are separated by at least one space.

Example

Input

text = " this is a sentence "

Output

"this is a sentence"

Explanation

There are a total of 9 spaces and 4 words. We can evenly divide the 9 spaces between the words: 9 / (4-1) = 3 spaces.

Python solution

class Solution:
    def reorderSpaces(self, text: str) -> str:
        spaces = text.count(" ")
        words = text.split()
        if len(words) == 1:
            return words[0] + " " * spaces
        cnt, mod = divmod(spaces, len(words) - 1)
        return (" " * cnt).join(words) + " " * mod

Complexity

Pattern: Hash Map

Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 1592. Rearrange Spaces Between Words is filed here because the reference solution below belongs to the algorithm family this hub collects, even though its LeetCode tags point elsewhere.

The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.

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