Day 1

.gitignore

@@ -0,0 +1 @@
+input.txt

01/1.go

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+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+)
+
+func main() {
+  inventories := parse(*bufio.NewScanner(os.Stdin))
+
+  largestInventoryTotal := 0
+  for _, inventory := range inventories {
+    currentTotal := inventory.getTotal()
+    if currentTotal > largestInventoryTotal {
+      largestInventoryTotal = currentTotal
+    }
+  }
+
+  fmt.Println(largestInventoryTotal)
+}

01/2.go

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+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+)
+
+func main() {
+  inventories := parse(*bufio.NewScanner(os.Stdin))
+
+  largestInventoriesTotal := []int{0, 0, 0}
+  largestInventoriesIndex := []int{-1, -1, -1}
+  for i := 0; i < 3; i++ {
+    for index, inventory := range inventories {
+      currentTotal := inventory.getTotal()
+      if currentTotal > largestInventoriesTotal[i] && index != largestInventoriesIndex[0] && index != largestInventoriesIndex[1] {
+        largestInventoriesTotal[i] = currentTotal
+        largestInventoriesIndex[i] = index
+      }
+    }
+  }
+
+  sum := 0
+  for _, inventoryTotal := range largestInventoriesTotal {
+    sum += inventoryTotal
+  }
+
+  fmt.Println(sum)
+}

01/parser.go

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+package main
+
+import (
+  "bufio"
+  "strconv"
+)
+
+type Inventory struct {
+  rations []int
+}
+
+func (inventory *Inventory) addRation(ration int) {
+  inventory.rations = append(inventory.rations, ration)
+}
+
+func (inventory Inventory) getTotal() int {
+  total := 0
+  for _, ration := range inventory.rations {
+    total += ration
+  }
+  return total
+}
+
+func parse(scanner bufio.Scanner) []Inventory {
+  inventories := []Inventory{}
+  currentInventory := Inventory{}
+
+  for scanner.Scan() {
+    line := scanner.Text()
+    if line == "" {
+      inventories = append(inventories, currentInventory)
+      currentInventory = Inventory{[]int{}}
+    } else {
+      ration, _ := strconv.Atoi(line)
+      currentInventory.addRation(ration)
+    }
+  }
+  inventories = append(inventories, currentInventory)
+
+  return inventories
+}