AoC 2020: day4

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2018/day_02/main.go

@@ -1,84 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"os"
-	"strings"
-)
-
-func checkDuplicates(s string) (bool, bool) {
-	two := false
-	three := false
-	charsInString := map[string]int{}
-	chars := strings.Split(s, "")
-	for _, c := range chars {
-		charsInString[c]++
-	}
-	for _, c := range charsInString {
-		if c == 2 {
-			two = true
-		} else if c == 3 {
-			three = true
-		}
-	}
-	return two, three
-}
-
-func compareStrings(s1, s2 string) (string, bool) {
-	diffCount := 0
-	diffString := ""
-	for i := 0; i < len(s1) && diffCount < 2; i++ {
-		if s1[i] == s2[i] {
-			diffString += string(s1[i])
-		} else {
-			diffCount++
-		}
-	}
-	if diffCount >= 2 {
-		return "", false
-	}
-	return diffString, true
-}
-
-func main() {
-	twos := 0
-	threes := 0
-	var stringStore []string
-	//We open the input file
-	file, err := os.Open("./input")
-	if err != nil {
-		//If there is an error we print it in the stderr and exit(1)
-		log.Fatal(err)
-	}
-	//We defer the closure of the file
-	defer file.Close()
-
-	//We create a scanner to the file
-	scan := bufio.NewScanner(file)
-
-	//We iterate throught the file line
-	for scan.Scan() {
-		currentString := scan.Text()
-		stringStore = append(stringStore, currentString)
-		two, three := checkDuplicates(currentString)
-		if two {
-			twos++
-		}
-		if three {
-			threes++
-		}
-	}
-	fmt.Printf("Part One: the checksum is %v\n", twos*threes)
-
-	for i, str := range stringStore {
-		for j := i + 1; j < len(stringStore); j++ {
-			ret, valid := compareStrings(str, stringStore[j])
-			if valid {
-				fmt.Printf("Part Two: the common letters are %v\n", ret)
-				os.Exit(0)
-			}
-		}
-	}
-}