utils

package

v0.0.0-...-74d6347 Latest Latest Go to latest Published: Nov 15, 2022 License: MIT Imports: 5 Imported by: 0

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Valid go.mod file

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Repository

github.com/devries/advent_of_code_2021

Links

Open Source Insights

Documentation ¶

Index ¶

Variables
func Check(e error, message string)
func Combinations(n int, m int) <-chan []int
func CountBits(n uint32) int
func Gcd(a, b int64) int64
func Lcm(a, b int64) int64
func OCRLetters(message string) string
func Permutations(n int) <-chan []int
func ReadLines(r io.Reader) []string
type Point

Constants ¶

This section is empty.

Variables ¶

View Source

var Directions = []Point{North, South, East, West}

Slice of cardinal directions

View Source

var East = Point{1, 0}

+X direction

View Source

var North = Point{0, 1}

+Y direction

View Source

var South = Point{0, -1}

-Y direction

View Source

var Verbose bool

Verbose flag. Use pflag.Parse() in main() to populate.

View Source

var West = Point{-1, 0}

-X direction

Functions ¶

func Check ¶

func Check(e error, message string)

Check if error is not nil and panic with message if it is.

func Combinations ¶

func Combinations(n int, m int) <-chan []int

Creates a channel that returns combinations of the first n integers in groups of length m. To be used as indices for combinations of slices.

func CountBits ¶

func CountBits(n uint32) int

Kernighan's Bit Counting Algorithm

func Gcd ¶

func Gcd(a, b int64) int64

Greatest Common Denominator

func Lcm ¶

func Lcm(a, b int64) int64

Least Common Multiple

func OCRLetters ¶

func OCRLetters(message string) string

Convert Advent of Code height 6 font letters to a string. The message must be represented as 6 rows of # and . characters separated by newlines.

func Permutations ¶

func Permutations(n int) <-chan []int

Permutations of n integers, to be used as index for slice permutations. Uses Heap's Algorithm (thanks wikipedia)

func ReadLines ¶

func ReadLines(r io.Reader) []string

Read all lines from reader. Panic if there is an issue

Types ¶

type Point ¶

type Point struct {
	X int
	Y int
}

2-D Point

func (Point) Add ¶

func (p Point) Add(p2 Point) Point

Return the sum of two points

func (Point) Left ¶

func (p Point) Left() Point

Turn point left 90 degrees

func (Point) Right ¶

func (p Point) Right() Point

Turn point right 90 degrees

func (Point) Scale ¶

func (p Point) Scale(factor int) Point

Multiply point by a scalar

Source Files ¶

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