2017 Day 02 Completed in Go

2017/day02/day02.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	inp := StdinToStrings()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(inp []string) {
+	fmt.Println("= Part 1 =")
+	var chk int
+	for i := range inp {
+		cells := strings.Split(inp[i], "\t")
+		max, min := -1, -1
+		for j := range cells {
+			tst := Atoi(cells[j])
+			if tst > max {
+				max = tst
+			}
+			if min < 0 || tst < min {
+				min = tst
+			}
+		}
+		chk += (max - min)
+	}
+	fmt.Println("Checksum: ", chk)
+	fmt.Println("")
+}
+
+func part2(inp []string) {
+	fmt.Println("= Part 2 =")
+	var chk int
+	for i := range inp {
+		cells := strings.Split(inp[i], "\t")
+		var foundIt bool
+		for j := range cells {
+			for k := j; k < len(cells); k++ {
+				jVal, kVal := Atoi(cells[j]), Atoi(cells[k])
+				if isThePair(jVal, kVal) {
+					foundIt = true
+					chk += getResult(jVal, kVal)
+					break
+				}
+			}
+			if foundIt {
+				break
+			}
+		}
+	}
+	fmt.Println("Checksum: ", chk)
+	fmt.Println("")
+}
+
+func isThePair(k, j int) bool {
+	if k == j {
+		return false
+	}
+	jVal, kVal := float64(j), float64(k)
+	return math.Mod(jVal, kVal) == 0 || math.Mod(kVal, jVal) == 0
+}
+
+func getResult(k, j int) int {
+	if k > j {
+		return k / j
+	}
+	return j / k
+}
+
+func StdinToStrings() []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
+}