2nd: small refactor of variables

cmd/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"adventofcode/pkg/one"
+	"adventofcode/pkg/two"
+	"fmt"
+)
+
+func main() {
+	fmt.Println("Day 1")
+	one.Run()
+	fmt.Println("Day 2")
+	two.Run()
+}

go.mod

@@ -0,0 +1,3 @@
+module adventofcode
+
+go 1.17

pkg/one/one.go

@@ -0,0 +1,80 @@
+package one
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func Run() {
+	fmt.Printf("1st solution: %d\n", solveFirst())
+	fmt.Printf("1nd solution: %d\n", solveSecond())
+}
+
+func readInput() []int {
+	file, err := os.Open("./pkg/one/input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+	numbers := make([]int, 0)
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		num, err := strconv.Atoi(scanner.Text())
+		if err != nil {
+			log.Fatal(err)
+		}
+		numbers = append(numbers, num)
+	}
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+	return numbers
+}
+
+func solveFirst() int {
+	p := 0
+	i := 0
+
+	for k, v := range readInput() {
+		if k == 0 {
+			p = v
+			continue
+		}
+		if p < v {
+			i++
+		}
+		p = v
+	}
+
+	return i
+}
+
+func solveSecond() int {
+	increasedMeasurements := 0
+	a := make([]int, 3)
+	b := make([]int, 3)
+	numbers := readInput()
+
+	for i := 0; i < len(numbers); i++ {
+		if i+4 <= len(numbers) {
+			a = numbers[i : i+3]
+			b = numbers[i+1 : i+4]
+			aSum := 0
+			bSum := 0
+			for _, v := range a {
+				aSum += v
+			}
+			for _, v := range b {
+				bSum += v
+			}
+			if bSum > aSum {
+				increasedMeasurements++
+			}
+		}
+	}
+
+	return increasedMeasurements
+}

pkg/two/two.go

@@ -0,0 +1,66 @@
+package two
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func Run() {
+	commands := readInput()
+	fmt.Printf("1st final position: %d\n", solve(commands, false))
+	fmt.Printf("2nd final position: %d\n", solve(commands, true))
+}
+
+func solve(commands []string, alt bool) int {
+	depth := 0
+	horizontalPosition := 0
+	aim := 0
+
+	for _, v := range commands {
+		command := strings.Split(v, " ")
+		switch command[0] {
+		case "forward":
+			x, _ := strconv.Atoi(command[1])
+			horizontalPosition += x
+			if alt {
+				depth += aim * x
+			}
+		case "up":
+			x, _ := strconv.Atoi(command[1])
+			if !alt {
+				depth -= x
+			} else {
+				aim -= x
+			}
+		case "down":
+			x, _ := strconv.Atoi(command[1])
+			if !alt {
+				depth += x
+			} else {
+				aim += x
+			}
+		}
+	}
+	return horizontalPosition * depth
+}
+
+func readInput() []string {
+	file, err := os.Open("./pkg/two/input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+	commands := make([]string, 0)
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		commands = append(commands, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+	return commands
+}