Code for day1, 2 in golang

go/1/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+    "bufio"
+    "fmt"
+    "github.com/emirpasic/gods/trees/binaryheap"
+    "os"
+    "path/filepath"
+    "strconv"
+)
+
+var (
+    f = "../../1.input.txt"
+)
+
+func must(e error) {
+    if e != nil {
+        panic(e)
+    }
+}
+
+func min(a, b interface{}) int {
+    c1 := a.(int)
+    c2 := b.(int)
+
+    switch {
+    case c1 < c2:
+        return 1
+    case c2 > c1:
+        return -1
+    default:
+        return 0
+    }
+}
+
+func main() {
+    fp, err:= filepath.Abs(f)
+    must(err)
+    rf, err := os.Open(fp)
+    must(err)
+    s := bufio.NewScanner(rf)
+    s.Split(bufio.ScanLines)
+
+    max := 0
+    mh := binaryheap.NewWith(min)
+    b := []string{}
+    for s.Scan() {
+        l := s.Text()
+
+        switch l {
+        case "":
+            sum := 0
+            for _, a := range b {
+                i, err := strconv.Atoi(a)
+                must(err)
+                sum = sum + i
+            }
+            mh.Push(sum)
+            if max < sum {
+                max = sum
+            }
+
+            b = []string{}
+        default:
+            b = append(b, l)
+        }
+    }
+
+    fmt.Println("max:", max)
+
+    lastN := []int{}
+    sum3 := 0
+
+    for range []int{1,2,3} {
+        e, _ := mh.Pop()
+        value := (e).(int)
+        lastN = append(lastN, value)
+        sum3 = sum3 + value
+    }
+
+    fmt.Println("last 3:", lastN, sum3)
+
+}

go/2/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+    "bufio"
+    "os"
+    "path/filepath"
+    "strings"
+)
+
+var (
+    f = "../../2.input.txt"
+
+    RPS = map[string] int {
+        "X":1,
+        "Y":2,
+        "Z":3,
+        "A":1,
+        "B":2,
+        "C":3,
+    }
+    outcome = map[string] int {
+        "A X":3,
+        "A Y":6,
+        "A Z":0,
+        "B X":0,
+        "B Y":3,
+        "B Z":6,
+        "C X":6,
+        "C Y":0,
+        "C Z":3,
+    }
+    // A:Rock B:Paper C:Scissor
+    // X:lose Y:draw Z:win
+    rRPS = map[string] string {
+        "A X":"C",
+        "A Y":"A",
+        "A Z":"B",
+        "B X":"A",
+        "B Y":"B",
+        "B Z":"C",
+        "C X":"B",
+        "C Y":"C",
+        "C Z":"A",
+    }
+    rOutcome = map[string] int {
+        "X":0,
+        "Y":3,
+        "Z":6,
+    }
+)
+
+func must(e error) {
+    if e != nil {
+        panic(e)
+    }
+}
+
+func Score(line string) int {
+    sp := strings.Split(line, " ")
+    return RPS[sp[1]] + outcome[line]
+}
+
+func RealScore(line string) int {
+    sp := strings.Split(line, " ")
+    throw := rRPS[line]
+    return RPS[throw] + rOutcome[sp[1]]
+}
+
+func main() {
+    fp, err:= filepath.Abs(f)
+    must(err)
+    rf, err := os.Open(fp)
+    must(err)
+    s := bufio.NewScanner(rf)
+    s.Split(bufio.ScanLines)
+
+    totScore := 0
+    totRealScore := 0
+    for s.Scan() {
+        l := s.Text()
+        totScore = Score(l) + totScore
+        totRealScore = RealScore(l) + totRealScore
+    }
+
+    println("part 1 score:", totScore)
+    println("part 2 score:", totRealScore)
+}