Day 2b

day02/day02.go

@@ -58,25 +58,38 @@ func isGameValid(game Game) bool {
 	return true
 }
 
-func ScanFile(file *os.File) (int, error) {
+func power(game Game) int {
+	var red, green, blue int
+	for _, set := range game.sets {
+		red = max(red, set.red)
+		green = max(green, set.green)
+		blue = max(blue, set.blue)
+	}
+	return red * green * blue
+}
+
+func ScanFile(file *os.File) (int, int, error) {
 	scanner := bufio.NewScanner(file)
-	sum := 0
+	var idSum, powerSum int
     for scanner.Scan() {
-		if game := parseGame(scanner.Text()); isGameValid(game) {
-			sum += game.id
+		game := parseGame(scanner.Text())
+		if isGameValid(game) {
+			idSum += game.id
 		}
+		powerSum += power(game)
     }
     if err := scanner.Err(); err != nil {
-        return 0, err
+        return 0, 0, err
     }
-	return sum, nil
+	return idSum, powerSum, nil
 }
 
 func main() {
-	sum, err := ScanFile(os.Stdin)
+	idSum, powerSum, err := ScanFile(os.Stdin)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Invalid input: %s\n", err)
 		return
 	}
-	fmt.Println(sum)
+	fmt.Println(idSum)
+	fmt.Println(powerSum)
 }

day02/day02_test.go

@@ -6,26 +6,21 @@ import (
 )
 
 func TestScanFile(t *testing.T) {
-    cases := []struct {
-        inFile string;
-		want int;
-    }{
-        {"input1.txt", 8},
-    }
+	inFile := "input.txt"
+	want1 := 8
+	want2 := 2286
 
-    for _, c := range cases {
-		f, err := os.Open(c.inFile)
-		if err != nil {
-			t.Fatal(err)
-		}
+	f, err := os.Open(inFile)
+	if err != nil {
+		t.Fatal(err)
+	}
 
-		got, err := ScanFile(f)
-		if err != nil {
-			t.Fatal(err)
-		}
-		
-		if got != c.want {
-			t.Errorf("ScanFile(%q) == %d, want %d", c.inFile, got, c.want)
-		}
+	got1, got2, err := ScanFile(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	
+	if got1 != want1 || got2 != want2 {
+		t.Errorf("ScanFile(%q) == %d, %d, want %d, %d", inFile, got1, got2, want1, want2)
 	}
 }