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find_billy_py's Introduction

Find Billy

A Python solution to the classic "Find Billy" problem in O(N) time and O(1) extra space.

Requirements

  • Python 3.6+
  • PIL

Usage

$ pip install image
$ python find_billy.py <file_path>

Example

$ python find_billy.py billy.txt
* | * | * | * | * | *
> | v | * | * | > | B
⌃ | > | > | > || *| < | < | < | < | *
> | > | > | > || *| * | * | * | * | *
1 | 2 | 3 | 4 | 5 | 6
Billy is at (6, 5)

Example Input

* * * * * *
> v * * > B
^ > > > ^ *
^ < < < < *
> > > > ^ *
^ * * * * *

Example Images

N = 12

12x12

N = 10

10x10

Runtime

Runtime

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