pipes/slides.html at master · okcpython/pipes · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Pipes Solver Implementation</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <style type="text/css">
        code {
            background-color: #f0f0f0;
        }
        /* Slideshow styles */
    </style>
</head>
<body>
<textarea id="source">

class: center, middle

# Solving The Pipes Problem
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### (AKA Diving into Toby's brain...and surviving...hopefully)

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# How I tried to solve the problem...

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# Define the problem

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# We have a number of discrete points must be connected with respect to direction

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### This looked to me like a pathing (graph) problem
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### DFS, BFS, A*, etc...

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# Scope the Problem

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### (Limited: The Board is Not Infinite)

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### No worries about stack/heap space, etc...


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# So I chose to implement Breadth First Search

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### I don't think it really made a difference--just needed to pick one

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# Getting Started

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# Define the board

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### Doubly-nested dictionary with row major ordering (y, x)

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### Each coordinate was a tile with a type and orientation (default N)

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# Traverse the board and try different possibilities

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# Start with a list of all gas tanks

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# For each item in the list, mark the tile as visited and try all possibilities with each neighbor

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# For each possibility, score how many connections are made

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# Set the tile and its currently examined neighbor to the orientation with the highest score

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# If we make a connection at all, and the neigbor has not been visited yet, add them to the list to visit

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# Note: If a tile is a house, and it is connected, leave it alone (houses only have one connectable edge)

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#  Things I learned:

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# Greedy works pretty well in most cases

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### Making the best choice at the time tended to work pretty well

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# Test all possibilities instead of trying to be too clever

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### Moved from a strategic approach to just testing all permutations of each tile with its neighbors


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# Don't be clever (did I already mention that?)

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### Like Forrest, I am not a smart man.  Be Basic. Iterate. Solutions will reveal themselves.

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# Write utility methods early so it is easier to tweak strategies

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### Get a tile, get its neighbors, fitness evaluation, etc...

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# Questions?

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Slides were made with http://remarkjs.com/

Source for slides can be found at https://github.com/okcpython/pipes

Heavily borrowed from slides found at https://github.com/okcpython/python3-slow-migration

</textarea>
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