start day 10

10/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func findTrailheads(tmap [][]int) [][]int {
+  trailheadsPositions := [][]int{}
+  for i:=range tmap {
+    for j:=range tmap[i] {
+      if tmap[i][j] == 0 {
+        trailheadsPositions = append(trailheadsPositions, []int{i,j})
+      }
+    }
+  }
+  return trailheadsPositions
+}
+
+func nextSteps(tmap [][]int, currentPosition []int) ([][]int, bool) {
+  paths := [][]int{}
+  found := false
+  if currentPosition[0] - 1 >= 0 && tmap[currentPosition[0]-1][currentPosition[1]] == tmap[currentPosition[0]][currentPosition[1]] + 1 {
+    paths = append(paths, []int{currentPosition[0]-1,currentPosition[1]})
+    found = true
+  } 
+  if currentPosition[0] + 1 < len(tmap) && tmap[currentPosition[0]+1][currentPosition[1]] == tmap[currentPosition[0]][currentPosition[1]] + 1 {
+    paths = append(paths, []int{currentPosition[0]+1,currentPosition[1]})
+    found = true
+  } 
+  if currentPosition[1] + 1 < len(tmap[currentPosition[0]]) && tmap[currentPosition[0]][currentPosition[1]+1] == tmap[currentPosition[0]][currentPosition[1]] + 1 {
+    paths = append(paths, []int{currentPosition[0],currentPosition[1]+1})
+    found = true
+  } 
+  if currentPosition[1] - 1 >= 0 && tmap[currentPosition[0]][currentPosition[1]-1] == tmap[currentPosition[0]][currentPosition[1]] + 1 {
+    paths = append(paths, []int{currentPosition[0],currentPosition[1]-1})
+    found = true
+  } 
+  return paths, found
+}
+
+func calcPath(tmap [][]int, start []int) [][]int {
+  path := [][]int{start}
+  for i:=1;i<=9;i++ {
+    nextStep, found := nextSteps(tmap,path[len(path)-1])
+    if ! found {
+      break
+    } else {
+      path = append(path, nextStep...)
+    }
+  }
+  return path
+}
+
+func main() {
+  file, _ := os.Open("test")
+//  file, _ := os.Open("input")
+  defer file.Close()
+  scanner := bufio.NewScanner(file)
+  tmap := [][]int{}
+  for scanner.Scan() {
+    line := scanner.Text()
+    level := strings.Split(line,"")
+    levelInt := []int{}
+    for i:=range level {
+      levelInteger, _ := strconv.Atoi(level[i])
+      levelInt = append(levelInt, levelInteger)
+    }
+    tmap = append(tmap, levelInt)
+  }
+  trailheadsPositions := findTrailheads(tmap)
+  for i := range trailheadsPositions {
+    path := calcPath(tmap,trailheadsPositions[i])
+    fmt.Println(path)
+    if len(path) == 10 {
+      
+    }
+  }
+}