Merge branch 'day04'

day04/inputs

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

day04/scratchcards.go

@@ -0,0 +1,115 @@
+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 SplitSets(s []string) ([]string, []string) {
+
+    // 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)
+
+	return myNumbers, winningNumbers  
+}
+
+func FindMatches(myNum []string, winNum []string) int {
+    matches := 0 
+	for i := range myNum {
+    	for j := range winNum {
+        	if (myNum[i] == winNum[j]) {
+            	matches += 1
+            	continue
+        	}
+    	}
+	}
+	return matches
+}
+
+func CalcTickets(s []string, index int, tpr []int ) {
+    
+	myNumbers, winningNumbers := SplitSets(s)
+	matches := FindMatches(myNumbers, winningNumbers)
+	if (matches > 0) {
+    	for j := 0; j < tpr[index]; j++ {
+        	for i := index; i < index + matches; i++ {
+            	tpr[i+1] += 1
+        	}
+        	
+    	}
+	}
+}
+
+func CalcScore (s []string, t *int) {
+
+	myNumbers, winningNumbers := SplitSets(s) 
+	matches := FindMatches(myNumbers, winningNumbers)
+	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()
+
+	// The total is a simple sum 
+	var total int = 0
+	var totalPoint *int = &total
+	// To keep track of the amount of tickets, an array as long
+	// as the number of lines
+	var lines []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+    	lines = append(lines, scanner.Text())
+	}
+	ticketsPerRow := make([]int, len(lines))
+	tprPoint := ticketsPerRow[0:len(lines)]
+
+	for i := range ticketsPerRow {
+    	ticketsPerRow[i] = 1
+	}
+	
+	// Scan every line
+	for i := 0; i < len(lines); i++ {
+    	// e.g.: Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+    	cardAndNumbers := strings.Split(lines[i], ":")
+    	// At this point, cardAndNumbers has "Card N"
+    	// We don't need this information (yet?)
+    	allNumbers := strings.Split(cardAndNumbers[1], "|")
+    	CalcScore(allNumbers, totalPoint)
+    	CalcTickets(allNumbers, i, tprPoint)
+	}
+
+	numTickets := 0
+	for i := range ticketsPerRow {
+    	numTickets += ticketsPerRow[i] 
+	}
+	fmt.Printf("The scratchcards are worth %d points.\n", total)
+	fmt.Printf("In total, I have %d scratchcards.", numTickets)
+}