Working first part of day04

day04/inputs

@@ -0,0 +1 @@
+../inputs

day04/scratchcards.go

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+package main
+
+import (
+    "fmt"
+    "strings"
+    "bufio"
+    "os"
+//    "strconv"
+	"regexp"
+)
+
+func check(e error) {
+    if e != nil {
+        panic(e)
+    }
+}
+
+func PrintAndWait(x ...any) {
+    fmt.Print(x)
+    fmt.Scanln() 
+}
+
+func CalcScore (s []string, t *int) {
+    // Split the two sets into winning and my numbers
+	tempwinningNumbers := s[0]
+	tempMyNumbers := s[1]
+	// Regex to populate a string with numbers
+	renum := regexp.MustCompile("[0-9]+")
+	myNumbers := renum.FindAllString(tempMyNumbers, -1)
+	winningNumbers := renum.FindAllString(tempwinningNumbers, -1) 
+
+	matches := 0
+	for i := range myNumbers {
+    	for j := range winningNumbers {
+        	if (myNumbers[i] == winningNumbers[j]) {
+            	matches += 1
+            	continue
+        	}
+    	}
+	}
+	if(matches > 0) {
+    	tempTotal := 1
+    	for i := 0; i < matches - 1; i++ {
+        	tempTotal *= 2
+    	}
+    	*t += tempTotal
+	}
+
+}
+
+func main() {
+	file, err := os.Open("./inputs/day04_input")
+	check(err)
+	defer file.Close()
+
+	var total int = 0
+	var totalPoint *int = &total
+
+	scanner := bufio.NewScanner(file)
+
+	// Scan every line
+	for scanner.Scan() {
+    	// e.g.: Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+    	line := scanner.Text()
+    	cardAndNumbers := strings.Split(line, ":")
+    	// At this point, cardAndNumbers has "Card N"
+    	// We don't need this information (yet?)
+    	allNumbers := strings.Split(cardAndNumbers[1], "|")
+    	CalcScore(allNumbers, totalPoint)
+	}
+	fmt.Printf("The scratchcards are worth %d points.", total)
+}