Скачать или смотреть How to Move Elements in a List-of-Lists Using Prolog for Your 8-Puzzle Solver

Learn how to manipulate a list-of-lists in Prolog to create an 8-puzzle solver, with a focus on moving elements effectively.
---
This video is based on the question https://stackoverflow.com/q/77289456/ asked by the user 'Enzogi' ( https://stackoverflow.com/u/22736274/ ) and on the answer https://stackoverflow.com/a/77291410/ provided by the user 'slago' ( https://stackoverflow.com/u/11535940/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Moving elements in a list-of-lists in prolog

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Mastering Movement in a List-of-Lists for Your 8-Puzzle Solver in Prolog

Creating an 8-puzzle solver in Prolog can be an exciting yet challenging task. One common issue that developers encounter is the movement of elements within a matrix, represented as a list-of-lists. It can be particularly daunting to manage the movement of the 0 tile -- the empty space -- adjacent to its initial position. If you're struggling to figure out how to execute these movements in Prolog, you're not alone! In this blog, we will break down how to achieve this step-by-step, making your 8-puzzle solver a reality.

Understanding the Problem

The task at hand is quite simple in theory: you need to move the 0 tile to an adjacent position in a 2D list, or matrix, that represents the state of the puzzle. Consider the following initial state of the puzzle:

[[See Video to Reveal this Text or Code Snippet]]

In this configuration, the 0 is located at the position (2, 1). Your job is to create rules in Prolog that will allow you to move 0 left, right, up, or down to form new valid states.

Solution Overview

The solution can be divided into several parts: defining movement rules, implementing corresponding functions, and testing those functions. Let’s dive deeper into each of these components.

1. Defining Movement Rules

Prolog allows you to define rules that represent the possible movements of the 0 tile. Below are the rules for left/right and up/down movements:

Left/Right Movements

Move 0 left or right on the same row.

[[See Video to Reveal this Text or Code Snippet]]

Up/Down Movements

Move 0 up or down to the corresponding position in an adjacent row.

[[See Video to Reveal this Text or Code Snippet]]

2. Implementing Movement Functions

Now that we have defined the movement rules, we can create a universal movement function that incorporates all possible actions:

[[See Video to Reveal this Text or Code Snippet]]

3. Testing the Movements

The final step is testing our movement functions. Here's an example of how to set up a test case using a predefined board state:

[[See Video to Reveal this Text or Code Snippet]]

With these rules in place, you can run ?- test(1). or ?- test(2). to check how the 0 tile moves in various scenarios.

Conclusion

By following these steps, you can efficiently manipulate a list-of-lists in Prolog, facilitating the movement of elements in your 8-puzzle solver. With practice and experimentation, you'll find that managing matrices in Prolog becomes an intuitive process. Feel free to reach out for assistance, and happy coding!