2020 Day 6 Complete

2020/day06/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	fmt.Println("# Day 6")
+	inp := h.StdinToStringSlice()
+	part2(inp)
+}
+
+func part1(inp []string) {
+	yeses := make(map[byte]bool)
+	var total int
+	for _, v := range inp {
+		if v == "" {
+			fmt.Printf("Group Total: %d\n", len(yeses))
+			total = total + len(yeses)
+			yeses = make(map[byte]bool)
+		} else {
+			for _, i := range v {
+				yeses[byte(i)] = true
+			}
+		}
+	}
+	fmt.Printf("Group Total: %d\n", len(yeses))
+	total = total + len(yeses)
+	fmt.Printf("Answer: %d\n", total)
+}
+
+func part2(inp []string) {
+	var total int
+	yeses := []byte{}
+	newgroup := true
+	for _, v := range inp {
+		if v == "" {
+			newgroup = true
+			var grouptotal int
+			for yk := range yeses {
+				if yeses[yk] != ' ' {
+					grouptotal++
+				}
+			}
+			total = total + grouptotal
+			fmt.Printf("Totals: %d -> %d\n", grouptotal, total)
+		} else {
+			if newgroup {
+				newgroup = false
+				yeses = []byte(v)
+				fmt.Println("Initializing", string(yeses))
+			} else {
+				for yk, yv := range yeses {
+					if !bytes.Contains([]byte(v), []byte{yv}) {
+						yeses[yk] = ' '
+						fmt.Println("Removing", string(yv), "->", string(yeses))
+					}
+				}
+			}
+		}
+	}
+	var grouptotal int
+	for yk := range yeses {
+		if yeses[yk] != ' ' {
+			grouptotal++
+		}
+	}
+	total = total + grouptotal
+	fmt.Printf("Totals: %d -> %d\n", grouptotal, total)
+	fmt.Printf("Answer: %d\n", total)
+}

2020/day06/testinput

@@ -0,0 +1,15 @@
+abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b