feat: solve part one

internal/2016/DayThree/code.go

@@ -0,0 +1,40 @@
+package daythree
+
+import (
+	"advent-of-code/internal/registry"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func init() {
+	registry.Register("2016D3", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) [][3]int {
+	content, _ := os.ReadFile(filepath)
+	lines := strings.Split(string(content), "\n")
+	var result [][3]int
+	for _, line := range lines {
+		var a, b, c int
+		fmt.Sscanf(line, "%d %d %d", &a, &b, &c)
+		result = append(result, [3]int{a, b, c})
+
+	}
+	return result
+}
+
+func PartOne(data [][3]int) int {
+	count := 0
+	for _, triangle := range data {
+		a, b, c := triangle[0], triangle[1], triangle[2]
+		if a+b > c && a+c > b && b+c > a {
+			count++
+		}
+	}
+	return count
+}
+
+func PartTwo(data [][3]int) int {
+	return 0
+}

internal/2016/DayThree/code_test.go

@@ -0,0 +1,28 @@
+package daythree
+
+import "testing"
+
+func TestPartOne(t *testing.T) {
+	input := [][3]int{{5, 10, 25}}
+	expected := 0
+	got := PartOne(input)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}
+
+func TestPartTwo(t *testing.T) {
+	input := [][3]int{
+		{101, 301, 501},
+		{102, 302, 502},
+		{103, 303, 503},
+		{201, 401, 601},
+		{202, 402, 602},
+		{203, 403, 603},
+	}
+	expected := 6
+	got := PartTwo(input)
+	if got != expected {
+		t.Errorf("PartTwo() = %d, want %d", got, expected)
+	}
+}

internal/2016/register.go

@@ -2,5 +2,6 @@ package year2016
 
 import (
 	_ "advent-of-code/internal/2016/DayOne"
+	_ "advent-of-code/internal/2016/DayThree"
 	_ "advent-of-code/internal/2016/DayTwo"
 )