2022 Day3 Complete!

2022/day03/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	fmt.Println("# Part 1")
+	fmt.Println(part1(inp))
+	fmt.Println("# Part 2")
+	fmt.Println(part2(inp))
+}
+
+func part1(inp []string) int {
+	var ret int
+	for i := range inp {
+		sack := inp[i]
+		c1, c2 := sack[:len(sack)/2], sack[len(sack)/2:]
+		var dupe byte
+		for _, c1w := range c1 {
+			for _, c2w := range c2 {
+				if c1w == c2w {
+					dupe = byte(c1w)
+					break
+				}
+			}
+			if dupe != 0 {
+				break
+			}
+		}
+		if dupe >= 'a' {
+			ret += int(dupe - 'a' + 1)
+		} else if dupe >= 'A' {
+			ret += int(dupe - 'A' + 27)
+		}
+	}
+	return ret
+}
+
+func part2(inp []string) int {
+	var ret int
+	elves := []string{"", "", ""}
+	for i := range inp {
+		elves[i%3] = inp[i]
+		if i%3 == 2 {
+			var badge byte
+			// Check 'em
+			for _, e1 := range elves[0] {
+				for _, e2 := range elves[1] {
+					for _, e3 := range elves[2] {
+						if e1 == e2 && e2 == e3 {
+							badge = byte(e1)
+						}
+					}
+					if badge != 0 {
+						break
+					}
+				}
+				if badge != 0 {
+					break
+				}
+			}
+			if badge >= 'a' {
+				ret += int(badge - 'a' + 1)
+			} else if badge >= 'A' {
+				ret += int(badge - 'A' + 27)
+			}
+		}
+	}
+	return ret
+}