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solutions/day6/day6.go

@@ -0,0 +1,58 @@
+package day6
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func allDifferent(a string) bool {
+	length := len(a)
+
+	for i := 0; i < length; i++ {
+		for j := i + 1; j < length; j++ {
+			if a[i] == a[j] {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+func Run(filename string, problemStr string) {
+	problem, err := strconv.Atoi(problemStr)
+	if err != nil || !(problem == 4 || problem == 14) {
+		fmt.Println("Didn't understand problem number", os.Args[2], "should be 4 or 14")
+	}
+
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if len(line) > 0 {
+			var index int
+			offset := problem - 1
+
+			for index = offset; index < len(line); index++ {
+				if allDifferent(line[index-offset : index+1]) {
+					break
+				}
+			}
+
+			fmt.Println("First marker after character", index+1)
+		}
+	}
+
+	file.Close()
+}