Reverse Words Without Libraries

MediumPython

Problem

Given a string, write a program to reverse the order of words without using built-in library functions. Treat any sequence of whitespace characters as a separator, discard leading and trailing whitespace, and return words separated by one space. Implement def reverse_words(s):, where s is a string and the result is a string. Do not use split(), join(), reverse(), or reversed().

Constraints

0 <= len(s) <= 10^5
Words contain non-whitespace characters
Whitespace may appear between, before, or after words
The output must contain exactly one space between adjacent words
Do not use split(), join(), reverse(), or reversed()

Function Signature

def reverse_words(s):

CodePython 3

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