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day01.go
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day01.go
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package main
import (
"fmt"
"strings"
)
var numbers = map[string]int{"zero": 0, "one": 1, "two": 2, "three": 3, "four": 4, "five": 5, "six": 6, "seven": 7, "eight": 8, "nine": 9}
func day01() {
lines := getLines("input/01.txt")
var result = getSum(lines, false)
var result2 = getSum(lines, true)
fmt.Println("Day 01 Part 1 Result: ", result)
fmt.Println("Day 01 Part 2 Result: ", result2)
}
func getSum(lines []string, part2 bool) int {
var sum int
for _, line := range lines {
var first, last int
out:
for i := 0; i < len(line); i++ {
if line[i] >= '0' && line[i] <= '9' {
first = int(line[i] - '0')
break
} else if part2 {
for k := range numbers {
if strings.HasPrefix(line[i:], k) {
first = numbers[k]
break out
}
}
}
}
out2:
for i := len(line) - 1; i >= 0; i-- {
if line[i] >= '0' && line[i] <= '9' {
last = int(line[i] - '0')
break
} else if part2 {
for k := range numbers {
if strings.HasSuffix(line[:i], k) {
last = numbers[k]
break out2
}
}
}
}
sum += 10*first + last
}
return sum
}