Author: Zen and the Art of Computer Programming
1 Introduction
Many companies are faced with processing massive amounts of data, so they need to analyze and process the data quickly and effectively, of which data cleaning is a very important link. How to quickly and accurately identify all palindrome substrings in text has become a hot issue worthy of study.
In this tutorial, I will introduce to you an algorithm based on a sliding window - "Manacher's Algorithm", which can efficiently solve the problem of detecting palindrome substrings in text. In addition, we will also implement the algorithm through the programming language Python and conduct comparative testing with other algorithms.
2. Explanation of basic concepts and terms
2.1 Sliding window
The sliding window algorithm (also known as sliding window mode, drawer method) is a very commonly used string matching algorithm. Its basic idea is to use a fixed-size window (also known as "sliding bar") in the text to be searched. The form continuously scans to match all characters in the current window. When a pattern or string is found to appear, continue to move to the right from the left edge of the current window, shrink the window, and continue searching; if the pattern or string is completely matched and completely covers the entire window, the pattern is considered to be successfully found. .
2.2 Palindrome string
A palindrome string refers to a string whose forward and reverse readings are the same, such as "racecar", "level", etc. Palindrome strings generally consist of words, numbers or symbols, and they all sound the same, but spaces, punctuation marks, special characters, etc. cannot appear.
2.3 Manacher's Algorithm
Manacher's Algorithm is a method to find all palindrome substrings in O(n) time complexity. The basic idea is as follows:
- Set two fingers