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Commit e23d7d6

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Day two done.
1 parent 4554bfa commit e23d7d6

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‎2018/day02/input.txt‎

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‎2018/day02/two.go‎

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package main
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import (
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"fmt"
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"os"
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"strings"
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)
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func main() {
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f, _ := os.ReadFile("input.txt")
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lines := strings.Split(strings.TrimSpace(string(f)), "\n")
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two, three := countOccurrences(lines)
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fmt.Printf("Part 1 | Checksum: %d\n", two*three)
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fmt.Printf("Part 2 | Matching strings: %s\n", findOneCharDiff(lines))
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}
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func countOccurrences(ids []string) (int, int) {
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two := 0
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three := 0
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for _, id := range ids {
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seen := map[rune]bool{}
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countedTwo := false // If 2 or more letters appear twice, it still will only count as 1.
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countedThree := false
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for _, letter := range id {
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// If we haven't counted this letter
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if _, ok := seen[letter]; !ok {
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seen[letter] = true
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occurrences := strings.Count(id, string(letter))
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if occurrences == 2 {
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if !countedTwo {
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two++
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countedTwo = true
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}
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}
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if occurrences == 3 {
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if !countedThree {
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countedThree = true
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three++
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}
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}
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}
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}
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}
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return two, three
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}
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func findOneCharDiff(ids []string) string {
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for _, id := range ids {
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for _, second := range ids {
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// Don't compare equal strings.
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diff := 0
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diffChar := ' '
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for i, char := range id {
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// Check if the character in string 1 is present in string 2
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// If it isnt, it is different
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if char != rune(second[i]) {
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diffChar = char
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diff++
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}
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// IF there is more than two characters different. This is not a match. Escape early.
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if diff > 2 {
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break
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}
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}
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// If the difference was only one character, we found it. Escape early.
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if diff == 1 {
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before, after, _ := strings.Cut(id, string(diffChar))
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return before + after
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}
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}
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}
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return ""
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}

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