aoc/aoc2015/day05.go

package aoc2015

import (
	"aoc/internal/utility"
	"fmt"
	"strings"
)

const vowels = "aeiou"

func day05part1(in string) int {
	m := utility.RuneMap(in)

	inVowels := 0
	for _, v := range vowels {
		inVowels += m[v]
	}
	if inVowels < 3 {
		return 0
	}

	doubled := false
	for i := 1; i < len(in); i++ {
		if in[i-1] == in[i] {
			doubled = true
			break
		}
	}
	if !doubled {
		return 0
	}

	for _, set := range []string{"ab", "cd", "pq", "xy"} {
		if strings.Contains(in, set) {
			return 0
		}
	}

	return 1
}

func day05part2(in string) int {
	doubled := false
	for i := 1; i < len(in); i++ {
		if strings.Contains(in[i+1:], in[i-1:i+1]) {
			doubled = true
			break
		}
	}
	if !doubled {
		return 0
	}

	for i := 2; i < len(in); i++ {
		if in[i-2] == in[i] {
			return 1
		}
	}

	return 0
}

func day05() {
	in := utility.GetLines("input/2015/05")
	var p1, p2 int
	for _, line := range in {
		p1 += day05part1(line)
		p2 += day05part2(line)
	}
	fmt.Println(p1)
	fmt.Println(p2)
}