[ch-080/jeongoon] Go solution added.

2 files changed, 122 insertions, 0 deletions

diff --git a/challenge-080/jeongoon/go/ch-1.go b/challenge-080/jeongoon/go/ch-1.go
new file mode 100644
index 0000000000..d78b813325
--- /dev/null
+++ b/challenge-080/jeongoon/go/ch-1.go
@@ -0,0 +1,74 @@
+package main
+
+/* Ref:
+https://tour.golang.org/flowcontrol/1
+https://www.davidkaya.com/sets-in-golang/
+https://golangdocs.com/converting-string-to-integer-in-golang
+*/
+
+/* test with:
+go run ch-1.go -2 3 5 2 1
+# > 4
+*/
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+var exists = struct{}{}
+
+type intSet struct {
+	m map[int]struct{}
+}
+
+func NewIntSet() *intSet {
+	s := &intSet{}
+	s.m = make(map[int]struct{})
+	return s
+}
+
+func (s *intSet) Add(value int) {
+	s.m[value] = exists
+}
+
+func (s *intSet) Remove(value int) {
+	delete(s.m, value)
+}
+
+func (s *intSet) Contains(value int) bool {
+	_, c := s.m[value]
+	return c
+}
+
+func main() {
+	set := NewIntSet()
+	max := 0
+	args := os.Args[1:] // ignore programme name
+
+	for _, it := range args {
+		int_val, err := strconv.Atoi( it )
+		if err != nil {
+			fmt.Fprint( os.Stderr, err )
+			fmt.Fprintln( os.Stderr, ": skipped" )
+		}
+		if int_val < 0 {
+			fmt.Fprintln( os.Stderr,
+				"negative values are unnecessary: skipped" )
+		} else {
+			set.Add( int_val )
+			if max < int_val {
+				max = int_val
+			}
+		}
+	}
+	max++;
+
+	for maybe_missing := 1; maybe_missing <= max; maybe_missing++ {
+		if ! set.Contains( maybe_missing ) {
+			fmt.Println( maybe_missing )
+			break
+		}
+	}
+}
diff --git a/challenge-080/jeongoon/go/ch-2.go b/challenge-080/jeongoon/go/ch-2.go
new file mode 100644
index 0000000000..3a78e3fe1c
--- /dev/null
+++ b/challenge-080/jeongoon/go/ch-2.go
@@ -0,0 +1,48 @@
+package main
+
+/* Ref:
+https://golangdocs.com/slices-in-golang
+*/
+
+/* test with:
+go run ch-2.go 1 5 4 2
+# > 6
+*/
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	args := os.Args[1:] // ignore programme name
+	rank := []int{}
+
+	for _, it := range args {
+		int_val, err := strconv.Atoi( it )
+		if err != nil {
+			fmt.Fprint( os.Stderr, err )
+			fmt.Fprintln( os.Stderr, ": skipped" )
+			continue
+		}
+		rank = append( rank, int_val )
+	}
+	rank_len := len(rank)
+	if rank_len == 0 {
+		fmt.Println("0 as no useuful data")
+		os.Exit(1)
+	}
+
+	left  := rank[0:rank_len -1]
+	right := rank[1:]
+
+	candies := rank_len
+
+	for i := 0; i < rank_len -2; i++ {
+		if left[i] != right[i] {
+			candies++
+		}
+	}
+	fmt.Println(candies)
+}