1 files changed, 27 insertions(+), 2 deletions(-)

M 2023/04.go

@@ 63,7 63,32 @@ func partA(fn string) {
 }
 
 func partB(fn string) {
+	cards := make(map[int]int)
+	for g, l := range getLines(fn) {
+		xs := strings.Split(l, ":")
+		ys := strings.Split(xs[1], "|")
+
+		ws := Ints(ys[0])
+		w := 0
+		for _, i := range Ints(ys[1]) {
+			for _, j := range ws {
+				if i == j {
+					w += 1
+					break
+				}
+			}
+		}
+
+		cards[g] += 1
+		for i := 1; i <= w; i++ {
+			cards[g+i] += cards[g]
+		}
+	}
+
 	var b int
+	for _, n := range cards {
+		b += n
+	}
 	log.Printf("%s: %v", fn, b)
 }
 


@@ 71,6 96,6 @@ func main() {
 	partA("04.example") // 13
 	partA("04.input") // 32609
 
-	//partB("04.example")
-	//partB("04.input")
+	partB("04.example") // 30
+	partB("04.input") // 14624680
 }