first commit

digidis-go/README.md

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+# adventofcode

digidis-go/day1/day1.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var (
+		v, step int
+		counts  = make(map[int]bool)
+	)
+	data, _ := ioutil.ReadFile("input.txt")
+	rows := strings.Split(string(data), "\n")
+	for {
+		for _, r := range rows {
+			if r[0] == '+' {
+				v += atoi(r[1:])
+			} else {
+				v -= atoi(r[1:])
+			}
+			if counts[v] {
+				fmt.Println(v)
+				return
+			}
+			counts[v] = true
+		}
+		if step == 0 {
+			fmt.Println(v)
+		}
+		step++
+	}
+}
+
+func atoi(s string) int {
+	i, _ := strconv.Atoi(s)
+	return i
+}