2023 Day 1 Complete

2023/day01/main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(input []string) {
+	var value int
+	for _, i := range input {
+		value = value + getValue(i, false)
+	}
+	fmt.Println("# Part 1")
+	fmt.Println(value)
+}
+
+var nums = []string{
+	"zero",
+	"one",
+	"two",
+	"three",
+	"four",
+	"five",
+	"six",
+	"seven",
+	"eight",
+	"nine",
+}
+
+func part2(input []string) {
+	var value int
+	for _, i := range input {
+		value = value + getValue(i, true)
+	}
+	fmt.Println("# Part 2")
+	fmt.Println(value)
+}
+
+func getValue(wrk string, p2 bool) int {
+	return (getFirstValue(wrk, p2) * 10) + getLastValue(wrk, p2)
+}
+func getFirstValue(wrk string, p2 bool) int {
+	for j := 0; j < len(wrk); j++ {
+		if p2 {
+			v := numStringAt(wrk, j)
+			if v > -1 {
+				return v
+			}
+		}
+		if wrk[j]-'0' >= 0 && wrk[j]-'0' <= 9 {
+			return int(wrk[j] - '0')
+		}
+	}
+	return 0
+}
+func getLastValue(wrk string, p2 bool) int {
+	for j := len(wrk) - 1; j >= 0; j-- {
+		if p2 {
+			v := numStringAt(wrk, j)
+			if v > -1 {
+				return v
+			}
+		}
+		if wrk[j]-'0' >= 0 && wrk[j]-'0' <= 9 {
+			return int(wrk[j] - '0')
+		}
+	}
+	return 0
+}
+
+func numStringAt(haystack string, pos int) int {
+	for i := range nums {
+		if stringAt(haystack, pos, nums[i]) {
+			return i
+		}
+	}
+	return -1
+}
+
+func stringAt(haystack string, pos int, needle string) bool {
+	if len(haystack) < pos+len(needle) {
+		return false
+	}
+	for i := range needle {
+		if haystack[pos+i] != needle[i] {
+			return false
+		}
+	}
+	return true
+}