64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package main
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import (
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"fmt"
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"strconv"
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"strings"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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func part1(input []string) {
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dirMap := map[byte]h.Coordinate{
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'U': h.Coordinate{X: 0, Y: -1},
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'R': h.Coordinate{X: 1, Y: 0},
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'D': h.Coordinate{X: 0, Y: 1},
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'L': h.Coordinate{X: -1, Y: 0},
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}
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curr, area := h.Coordinate{X: 0, Y: 0}, 0
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for i := range input {
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pts := strings.Fields(input[i])
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dir, length, _ := pts[0][0], h.Atoi(pts[1]), strings.Trim(pts[1], "()")
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n := curr.Add(dirMap[dir].Mul(length))
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area += curr.X*n.Y - curr.Y*n.X + length
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curr = n
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}
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fmt.Println("# Part 1")
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fmt.Println(area/2 + 1)
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}
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func part2(input []string) {
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dirMap := map[byte]h.Coordinate{
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'3': h.Coordinate{X: 0, Y: -1},
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'0': h.Coordinate{X: 1, Y: 0},
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'1': h.Coordinate{X: 0, Y: 1},
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'2': h.Coordinate{X: -1, Y: 0},
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}
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hexToDec := func(hex string) int {
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v, _ := strconv.ParseInt(hex, 16, strconv.IntSize)
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return int(v)
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}
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curr, area := h.Coordinate{X: 0, Y: 0}, 0
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for i := range input {
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pts := strings.Fields(input[i])
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pts[2] = strings.Trim(pts[2], "#()")
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length := hexToDec(pts[2][:len(pts[2])-1])
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dir := pts[2][len(pts[2])-1:][0]
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n := curr.Add(dirMap[dir].Mul(length))
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area += curr.X*n.Y - curr.Y*n.X + length
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curr = n
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}
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fmt.Println("# Part 2")
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fmt.Println(area/2 + 1)
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}
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