adv2018_1b.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
)

func main() {
	freqs := make(map[int]bool)

	total := 0
	numbers := data()

Outer:
	for {
		for _, number := range numbers {
			total += number
			if freqs[total] {
				break Outer
			}
			freqs[total] = true
		}
	}

	fmt.Println(total)
}

func data() []int {
	var buff []int
	file, err := os.Open("./one_input")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)

	for scanner.Scan() {
		number, _ := strconv.Atoi(scanner.Text())
		buff = append(buff, number)
	}
	return buff
}