2022 day 25 complete

2022/day25/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"math"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+}
+
+func part1(inp []string) {
+	var v int
+	for i := range inp {
+		v = v + SNAFUToDec(inp[i])
+	}
+	fmt.Println("# Part 1")
+	fmt.Println(DecToSNAFU(v))
+}
+
+func SNAFUToDec(inp string) int {
+	var res int
+	var place float64
+	for i := len(inp) - 1; i >= 0; i-- {
+		var v int
+		if inp[i] == '-' {
+			v = -1
+		} else if inp[i] == '=' {
+			v = -2
+		} else {
+			v = int(inp[i] - '0')
+		}
+		v = v * int(math.Pow(5, place))
+		place++
+		res = res + v
+	}
+	return res
+}
+
+func DecToSNAFU(v int) string {
+	var res string
+	for v > 0 {
+		res = string("=-012"[(v+2)%5]) + res
+		v = (v + 2) / 5
+	}
+	return res
+}