2023 day 4 but 3x faster

2023/04/part2-fast/main.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	reader := bufio.NewReader(os.Stdin)
+
+
+	lines := []string{}
+
+	for text, err := reader.ReadString('\n'); err == nil; text, err = reader.ReadString('\n') {
+		lines = append(lines, text)
+	}
+
+	size := len(lines)
+
+	fmt.Printf("%v lines\n", size)
+
+	linepoints := make([]int, size)
+
+	for i, text := range lines {
+		amt := score(text)
+		fmt.Printf("%v %v\n", text, amt)
+		linepoints[i] = amt
+	}
+
+	const maxPoints = 10
+
+	newTot := 0;
+	mults := make([]int, size)
+
+	for line, points := range linepoints {
+
+		mul := 1
+		for i := line - maxPoints; i < line; i++ {
+			if i < 0 {
+				continue
+			}
+			end := i + linepoints[i]
+			if end >= line {
+				mul += mults[i]
+			}
+		}
+		mults[line] = mul
+
+		newTot += mul
+		fmt.Printf("%v | +%v = %v \n", points, mul, newTot)
+	}
+
+	fmt.Printf("total cards: %v", newTot)
+
+}
+
+func score(text string) int {
+	amt := 0
+
+	text = strings.Trim(text, "\n")
+
+	gameStr := strings.ReplaceAll(strings.Split(text, ": ")[1], "  ", " ")
+
+	nums := strings.Split(gameStr, " | ")
+
+	winners := strings.Split(nums[0], " ")
+	draw := strings.Split(nums[1], " ")
+
+	for _, n := range draw {
+		match := false
+		for _, w := range winners {
+			match = n == w
+			if match {
+				break
+			}
+		}
+		if match {
+			amt++
+		}
+	}
+
+	return amt
+}
+

2023/04/part2/main.go

@@ -19,7 +19,7 @@ func main() {
 		text = strings.Trim(text, "\n")
 		points := score(text);
 
-		fmt.Printf("%v: %v\n", text, points);
+		// fmt.Printf("%v: %v\n", text, points);
 
 		newMultipliers := []int{};
 		for i := range multipliers {
@@ -36,7 +36,7 @@ func main() {
 		}
 
 		total += multiplier;
-		fmt.Printf("+%v = %v\n", multiplier, total);
+		fmt.Printf("%v | +%v = %v\n", points, multiplier, total);
 	}
 
 	fmt.Printf("total cards: %v", total);