2018 Day 02 Complete

2018/day02/day02.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	inp := StdinToStringSlice()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(inp []string) {
+	var twos, threes int
+	for _, v := range inp {
+		var vintwos, vinthrees bool
+		for i := range v {
+			if !vintwos && strings.Count(v, string(v[i])) == 2 {
+				twos++
+				vintwos = true
+			}
+			if !vinthrees && strings.Count(v, string(v[i])) == 3 {
+				threes++
+				vinthrees = true
+			}
+		}
+	}
+	fmt.Println(twos * threes)
+}
+
+func part2(inp []string) {
+	for _, v1 := range inp {
+		for _, v2 := range inp {
+			if v1 == v2 {
+				continue
+			}
+			var diff int
+			for k := range v1 {
+				if v1[k] != v2[k] {
+					diff++
+				}
+				if diff > 1 {
+					continue
+				}
+			}
+			if diff == 1 {
+				fmt.Println(v1)
+				fmt.Println(v2)
+				return
+			}
+		}
+	}
+}
+
+func StdinToStringSlice() []string {
+	var input []string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = append(input, scanner.Text())
+	}
+	return input
+}
+
+func Atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi")
+	}
+	return ret
+}