Day 3

day03/ex2/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+  "aoc2022/day03/common"
+)
+
+func main() {
+  rucksacks := common.Parse(*bufio.NewScanner(os.Stdin))
+  sum := 0
+
+  for i := 0; i < len(rucksacks); i+=3 {
+    rucksack := rucksacks[i]
+    commonItems := append(rucksack.GetCompartment(1).GetItems(), rucksack.GetCompartment(2).GetItems()...)
+    for j := 1; j <= 2; j++ {
+      for k := 0; k < len(commonItems); k++ {
+        item := commonItems[k]
+        if !rucksacks[i+j].GetCompartment(1).ContainsItem(item) && !rucksacks[i+j].GetCompartment(2).ContainsItem(item) {
+          commonItems = append(commonItems[:k], commonItems[k+1:]...)
+          k--
+        }
+      }
+    }
+    sum += commonItems[0]
+  }
+
+  fmt.Println(sum)
+}