Day 9 part 1 done

9/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+//  file, _ := os.Open("test")
+  file, _ := os.Open("input")
+  defer file.Close()
+  scanner := bufio.NewScanner(file)
+  diskMap := []string{}
+  for scanner.Scan() {
+    line := scanner.Text()
+    diskMap = append(diskMap, strings.Split(line, "")...)
+  }
+  fileID := 0
+  blockSize := 0
+  freeSpace := 0
+  blocks := []string{}
+  for i := range diskMap {
+    if i % 2 == 0 {
+      blockSize, _ = strconv.Atoi(diskMap[i])
+      for j:=0;j<blockSize;j++ {
+        blocks = append(blocks, strconv.Itoa(fileID))
+      }
+      fileID++
+    } else {
+      freeSpace, _ = strconv.Atoi(diskMap[i])
+      for j:=0;j<freeSpace;j++ {
+        blocks = append(blocks, ".")
+      }
+    }
+  }
+  for i := range blocks {
+    if blocks[i] == "." {
+      for j:=len(blocks)-1;j>i;j-- {
+        if blocks[j] != "." {
+          blocks[i] = blocks[j]
+          blocks[j] = "."
+          break
+        }
+      }
+    }
+  }
+  checksum := 0
+  for i := range blocks {
+    blockID, _ := strconv.Atoi(blocks[i])
+    checksum = checksum + i * blockID
+  }
+  fmt.Println(checksum)
+}