day 9a complete

day9/day 9a/go.mod

@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17

day9/day 9a/main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("testInput")
+	answer := 0
+
+	for y, row := range *content {
+		for x, value := range row {
+
+			low := true
+
+			for _, n := range *neighbours(x, y, len((*content)[0]), len(*content)) {
+				//Check for each value if the current one we are looking
+				//at is greater than any of its neighbours
+				if value >= (*content)[n[0]][n[1]] {
+					low = false
+					break
+				}
+			}
+			if low {
+				answer += (1 + value)
+			}
+		}
+	}
+
+	fmt.Println(answer)
+}
+
+func neighbours(x int, y int, lenX int, lenY int) *[][]int {
+	var neighbours [][]int
+
+	if x > 0 {
+		//Cell left
+		neighbours = append(neighbours, []int{y, x - 1})
+	}
+	if x < lenX-1 {
+		//Cell right
+		neighbours = append(neighbours, []int{y, x + 1})
+	}
+	if y > 0 {
+		//Cell Above
+		neighbours = append(neighbours, []int{y - 1, x})
+	}
+	if y < lenY-1 {
+		//Cell Below
+		neighbours = append(neighbours, []int{y + 1, x})
+	}
+	return &neighbours
+}
+
+func returnContent(path string) *[][]int {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content [][]int
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		var values []int
+		for _, val := range strings.Split(scanner.Text(), "") {
+			num, _ := strconv.Atoi(val)
+			values = append(values, num)
+		}
+		content = append(content, values)
+	}
+
+	return &content
+}

day9/day 9a/testInput

@@ -0,0 +1,5 @@
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678