day3.go

package main

import (
	"fmt"
	"strings"
	"unicode"
)

func main() {
	fmt.Println(part1(input1))
	fmt.Println(part1(input2))
	fmt.Println(part2(input1))
	fmt.Println(part2(input2))
}

func part1(input string) int {
	var total int
	for _, row := range strings.Split(input, "\n") {
		mid := len(row) / 2
		items := overlap(row[:mid], row[mid:])
		for _, item := range items {
			total += priority(item)
		}

	}
	return total
}

func part2(input string) int {
	var total int
	rows := strings.Split(input, "\n")
	for i := 0; i < len(rows); i += 3 {
		l, m, r := rows[i], rows[i+1], rows[i+2]
		items := string(overlap(string(overlap(l, m)), r))
		for _, item := range items {
			total += priority(item)
		}

	}
	return total
}

func priority(r rune) int {
	if r == unicode.ToLower(r) {
		return int(r-'a') + 1
	}
	return int(r-'A') + 1 + 26
}

func overlap(a, b string, rest ...string) []rune {
	if len(a) < len(b) {
		return overlap(b, a)
	}
	cache := make(map[rune]bool)
	for _, c := range a {
		cache[c] = true
	}
	var result []rune
	found := make(map[rune]bool)
	for _, c := range b {
		if cache[c] && !found[c] {
			found[c] = true
			result = append(result, c)
		}
	}
	return result
}

var input1 = `vJrwpWtwJgWrhcsFMMfFFhFp
jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
PmmdzqPrVvPwwTWBwg
wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
ttgJtRGJQctTZtZT
CrZsJsPPZsGzwwsLwLmpwMDw`

var input2 = `BdbzzddChsWrRFbzBrszbhWMLNJHLLLLHZtSLglFNZHLJH
nnfMwqpQTMffHlNNLllHnZSS
cGpcMwfppfqcjcTCBBzWDsDbDrjzWz
LhfjhcdjcGdhFfdGfdjdvwCCZMvvLvWwMLCLSwZC
rDnsbmptPmlbQMCrQWQQBZQW
gltgVPngDPbptPsbPzVgmDldfTdfczThjJJjfMcJdFHjjH
dGlgDflTLLLrRLTLVdQLcQMnbvHbbFzNNvMbnHHn
sZjWJJCSjWqfCqSjSmJSbFvCzBMBBzHncHNvMBHN
twqqwpZwfrlwRwDGDR
zCGGFTQMQrsNRNGZdR
cLLQgPDpgcgmvPRHrwBdvrNZ
glWpmJWQDcJpQnpjSmbhFtMnqFfCVTCFCFFM
zNZWFNZBFrGTdBcZZBdJTrGrmgvppgDHwHmgVHCHCvCPDjzC
qtqqPnLSfLwvjvvgvvqH
MtbLLLQbRfPRfnbnnLMtnsbdBNsrGWNWcNcTBWZrrcrWcJ
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VqttMWFmDbjbzrSWRQ
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tzJlJzQllFLqtwHhjNSdtthjDhTN
fsDLDDnwvnSdqLSsFSDfsLpbgVttPMpPNjMWVMNfpjgW
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JmTTrTmjRTJqSQQSFqQw
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