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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"log"
"os"
)
func main() {
// open file with the input values
file, err := os.Open("input.txt")
if err != nil {
log.Fatal("Cannot open the input file.")
}
defer file.Close()
// open a scanner to read from the file
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanLines)
// process all lines
anyone := 0
everyone := 0
firstPerson := true
var anyoneLetters = make(map[rune]struct{})
var everyoneLetters = make(map[rune]struct{})
for scanner.Scan() {
line := scanner.Text()
// process the data if empty line
if len(line) == 0 {
anyone += len(anyoneLetters)
everyone += len(everyoneLetters)
anyoneLetters = make(map[rune]struct{})
everyoneLetters = make(map[rune]struct{})
firstPerson = true
continue
}
for _, l := range line {
// add all letters uniquely to anyoneLetters
if _, ok := anyoneLetters[l]; !ok {
anyoneLetters[l] = struct{}{}
}
// if this is the first person, add its letters to everyoneLetters
if firstPerson {
everyoneLetters[l] = struct{}{}
}
}
// if this is not the first person, compare letters in everyoneLetters and line
if !firstPerson {
for s := range everyoneLetters {
found := false
for _, l := range line {
if s == l {
found = true
}
}
// if the tested everyoneLetter is not in line, remove it
if !found {
delete(everyoneLetters, s)
}
}
}
// in the next round, it won't be the first person
firstPerson = false
}
// add last line
anyone += len(anyoneLetters)
everyone += len(everyoneLetters)
// print the gold star results
fmt.Println("Part 1:", anyone)
fmt.Println("Part 2:", everyone)
}