Day 01

01/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"log"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/thoas/go-funk"
+)
+
+func main() {
+	inputBytes, _ := os.ReadFile("input.txt")
+	inputs := strings.Split(string(inputBytes), "\n")
+
+	log.Println("Puzzle 1:", puzzle1(inputs))
+	log.Println("Puzzle 2:", puzzle2(inputs))
+}
+
+func puzzle1(inputs []string) int {
+	increased := 0
+	last := 0
+	for _, input := range inputs {
+		inputNo, _ := strconv.Atoi(input)
+		if last > 0 && inputNo > last {
+			increased++
+		}
+		last = inputNo
+	}
+	return increased
+}
+
+func puzzle2(inputs []string) int {
+	increased := 0
+	last3 := []int{0, 0, 0}
+	for _, input := range inputs {
+		inputNo, _ := strconv.Atoi(input)
+		new3 := append(last3[1:], inputNo)
+		newSum := funk.SumInt(new3)
+		lastSum := funk.SumInt(last3)
+		if !funk.ContainsInt(last3, 0) && !funk.ContainsInt(new3, 0) && newSum > lastSum {
+			increased++
+		}
+		last3 = new3
+	}
+	return increased
+}

01/main_test.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test(t *testing.T) {
+	input := `199,200,208,210,200,207,240,269,260,263`
+	assert.Equal(t, 7, puzzle1(strings.Split(input, ",")))
+	assert.Equal(t, 5, puzzle2(strings.Split(input, ",")))
+}

go.mod

@@ -0,0 +1,14 @@
+module git.jlel.se/jlelse/aoc21
+
+go 1.17
+
+require (
+	github.com/stretchr/testify v1.7.0
+	github.com/thoas/go-funk v0.9.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

go.sum

@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/thoas/go-funk v0.9.1 h1:O549iLZqPpTUQ10ykd26sZhzD+rmR5pWhuElrhbC20M=
+github.com/thoas/go-funk v0.9.1/go.mod h1:+IWnUfUmFO1+WVYQWQtIJHeRRdaIyyYglZN7xzUPe4Q=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=