anna-oake
diff --git a/‎.gitignore
Lines changed: 1 addition & 1 deletion b/‎.gitignore
Lines changed: 1 addition & 1 deletion
diff --git a/‎d5.go
Lines changed: 79 additions & 0 deletions b/‎d5.go
Lines changed: 79 additions & 0 deletions
diff --git a/‎data/README.md
Lines changed: 5 additions & 0 deletions b/‎data/README.md
Lines changed: 5 additions & 0 deletions
@@ -1,2 +1,2 @@
-data/*.big.txt
+data/*.txt
 .DS_Store
@@ -0,0 +1,79 @@
+package main
+
+import (
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func (*methods) D5P1(input string) string {
+	parts := strings.Split(input, "\n\n")
+
+	rlines := strings.Split(parts[0], "\n")
+	rules := make(map[string]bool)
+	for _, rl := range rlines {
+		rules[rl] = true
+	}
+
+	updates := strings.Split(parts[1], "\n")
+	var sum int
+	for _, u := range updates {
+		upd := strings.Split(u, ",")
+		sort.Slice(upd, func(i, j int) bool {
+			a := upd[i]
+			b := upd[j]
+			_, ok := rules[a+"|"+b]
+			if ok {
+				return true
+			}
+			_, ok = rules[b+"|"+a]
+			if ok {
+				return false
+			}
+			return false
+		})
+		u2 := strings.Join(upd, ",")
+		if u != u2 {
+			continue
+		}
+		n, _ := strconv.Atoi(upd[len(upd)/2])
+		sum += n
+	}
+	return strconv.Itoa(sum)
+}
+
+func (*methods) D5P2(input string) string {
+	parts := strings.Split(input, "\n\n")
+
+	rlines := strings.Split(parts[0], "\n")
+	rules := make(map[string]bool)
+	for _, rl := range rlines {
+		rules[rl] = true
+	}
+
+	updates := strings.Split(parts[1], "\n")
+	var sum int
+	for _, u := range updates {
+		upd := strings.Split(u, ",")
+		sort.Slice(upd, func(i, j int) bool {
+			a := upd[i]
+			b := upd[j]
+			_, ok := rules[a+"|"+b]
+			if ok {
+				return true
+			}
+			_, ok = rules[b+"|"+a]
+			if ok {
+				return false
+			}
+			return false
+		})
+		u2 := strings.Join(upd, ",")
+		if u == u2 {
+			continue
+		}
+		n, _ := strconv.Atoi(upd[len(upd)/2])
+		sum += n
+	}
+	return strconv.Itoa(sum)
+}
@@ -0,0 +1,5 @@
+The input for the puzzles goes here.
+
+The files should be named `d%d.txt`, where `%d` is the day number starting with 1.
+
+Thus, the input for the day 3 puzzle would be in `data/d3.txt`.
Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`		`-data/*.big.txt`
	`1`	`+data/*.txt`
`2`	`2`	`.DS_Store`