43 lines
728 B
Go
43 lines
728 B
Go
package main
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import (
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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const DIR = "/home/fernando/GolandProjects/advent-20/"
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func readInput(isTest bool) string {
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bytes, err := os.ReadFile(DIR + "inputs/01.txt")
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if err != nil {
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fmt.Println(err)
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panic("Error reading file.")
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}
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return string(bytes)
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}
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func main() {
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input := readInput(false)
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values := strings.Split(input, "\n")
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remainders := make(map[int]bool)
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for _, valueStr := range values {
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value, ok := strconv.Atoi(valueStr)
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if ok != nil {
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panic("Error converting to int")
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}
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currentRemainder := 2020 - value
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if _, ok := remainders[currentRemainder]; ok {
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fmt.Println(value * currentRemainder)
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break
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} else {
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remainders[value] = true
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}
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}
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}
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