Code for day 3, 4 in golang

go/3/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+    "bufio"
+    "github.com/emirpasic/gods/sets/hashset"
+    "os"
+    "path/filepath"
+)
+
+var (
+    f = "../../3.input.txt"
+    // why go why is an element in a string int32, but uint8 in a interface{}
+    p = map[int32]int{}
+)
+
+func must(e error) {
+    if e != nil {
+        panic(e)
+    }
+}
+
+func main() {
+    fp, err := filepath.Abs(f)
+    must(err)
+    rf, err := os.Open(fp)
+    must(err)
+    s := bufio.NewScanner(rf)
+    s.Split(bufio.ScanLines)
+
+    for i, c := range "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" {
+        p[c] = i + 1
+    }
+
+    pScore := 0
+    for s.Scan() {
+        line := s.Text()
+        half := len(line)/2
+        c1, c2 := line[:half], line[half:]
+        s1, s2 := hashset.New(), hashset.New()
+        for i := 0; i < len(c1); i++ {
+            s1.Add(c1[i])
+            s2.Add(c2[i])
+        }
+        shared := s1.Intersection(s2).Values()[0].(byte) // I am cancer (the interface{} thats uint8)
+//        println(string(shared))
+        s := int32(shared)
+        pScore = pScore + p[s]
+    }
+
+    println("parts score:", pScore)
+
+    rf.Close()
+    rf, err = os.Open(fp)
+    must(err)
+    s = bufio.NewScanner(rf)
+
+    commonScore := 0
+    for s.Scan() {
+        lines3 := [3]string{}
+        var s3 [3]*hashset.Set
+
+        lines3[0] = s.Text()
+        s.Scan()
+        lines3[1] = s.Text()
+        s.Scan()
+        lines3[2] = s.Text()
+
+        for i := 0; i < 3; i++ {
+            s3[i] = hashset.New()
+        }
+
+        for i := 0; i < 3; i++ {
+            for _, c := range lines3[i] {
+                s3[i].Add(c)
+            }
+        }
+
+        common := s3[0].Intersection(s3[1].Intersection(s3[2])).Values()[0].(int32) // AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+//        println(string(common))
+//        c := int32(common)
+        commonScore = commonScore + p[common]
+    }
+
+    println("common score among 3:", commonScore)
+}

go/4/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+    "bufio"
+    "os"
+    "path/filepath"
+    "strconv"
+    "strings"
+)
+
+var (
+    f = "../../4.input.txt"
+)
+
+func must(e error) {
+    if e != nil {
+        panic(e)
+    }
+}
+
+func conv(s string) int {
+    i, err := strconv.Atoi(s)
+    must(err)
+    return i
+}
+
+func main() {
+    fp, err := filepath.Abs(f)
+    must(err)
+    rf, err := os.Open(fp)
+    must(err)
+    s := bufio.NewScanner(rf)
+    s.Split(bufio.ScanLines)
+
+    split := strings.Split
+    containCount := 0
+    overlapCount := 0
+    for s.Scan() {
+        l := s.Text()
+        p := split(l, ",")
+        ids1 := split(p[0], "-")
+        ids2 := split(p[1], "-")
+        id1 := []int{conv(ids1[0]), conv(ids1[1])}
+        id2 := []int{conv(ids2[0]), conv(ids2[1])}
+
+        if id1[0] <= id2 [0] && id1[1] >= id2[1] ||
+            id1[0] >= id2 [0] && id1[1] <= id2[1] {
+            containCount = containCount + 1
+        }
+        if id1[0] <= id2[1] && id1[1] >= id2[0] {
+            overlapCount = overlapCount + 1
+        }
+    }
+
+    println("contains count:", containCount)
+    println("overlaps count:", overlapCount)
+}