implement day 6 part 1 and 2

day06.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+)
+
+type day06 struct{}
+
+func (d day06) solve1(r io.Reader) string {
+	buf := bufio.NewReader(r)
+	values := make([][]int, 2)
+	total := 1
+
+	for i := 0; i < 2; i++ {
+		_, err := buf.ReadString(':')
+		if err != nil {
+			panic(err)
+		}
+
+		str, _ := buf.ReadString('\n')
+		values[i] = scanints(str)
+	}
+
+	for i := 0; i < len(values[0]); i++ {
+		time := values[0][i]
+		record := values[1][i]
+
+		wins := 0
+		for j := 0; j <= time; j++ {
+			distance := ((time - j /*remaining time*/) * (j /*speed*/))
+			if distance > record {
+				wins++
+			}
+		}
+		total *= wins
+		wins = 0
+	}
+
+	return fmt.Sprintf("%d", total)
+}
+
+func (d day06) solve2(r io.Reader) string {
+	buf := bufio.NewReader(r)
+	values := make([][]int, 2)
+	total := 0
+
+	for i := 0; i < 2; i++ {
+		_, err := buf.ReadString(':')
+		if err != nil {
+			panic(err)
+		}
+		str, _ := buf.ReadString('\n')
+		values[i] = scanints(spaceReplacer.Replace(str))
+	}
+
+	time := values[0][0]
+	record := values[1][0]
+
+	for i := 0; i < time; i++ {
+		distance := (time - i) * i
+		if distance > record {
+			total++
+		}
+	}
+
+	return fmt.Sprintf("%d", total)
+}