From b680e5bcef16416d5bd6de874efcd5a3987fe1b9 Mon Sep 17 00:00:00 2001
From: Guillermo Ramos <gramos@gramos.me>
Date: Wed, 31 Mar 2021 00:04:26 +0200
Subject: Challenge 106 (Go)

Maximum Gap + Decimal String
---
 challenge-106/guillermo-ramos/go/ch-1.go | 29 ++++++++++++
 challenge-106/guillermo-ramos/go/ch-2.go | 76 ++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 challenge-106/guillermo-ramos/go/ch-1.go
 create mode 100644 challenge-106/guillermo-ramos/go/ch-2.go

diff --git a/challenge-106/guillermo-ramos/go/ch-1.go b/challenge-106/guillermo-ramos/go/ch-1.go
new file mode 100644
index 0000000000..bb9ee58e9d
--- /dev/null
+++ b/challenge-106/guillermo-ramos/go/ch-1.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+)
+
+func main() {
+	numbers := make(sort.IntSlice, 0, len(os.Args)-1)
+	for _, v := range os.Args[1:] {
+		n, err := strconv.Atoi(v)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		numbers = append(numbers, n)
+	}
+	sort.Sort(numbers)
+	var maxGap int
+	for i := 0; i < len(numbers)-1; i++ {
+		diff := numbers[i+1] - numbers[i]
+		if diff > maxGap {
+			maxGap = diff
+		}
+	}
+	fmt.Println(maxGap)
+}
diff --git a/challenge-106/guillermo-ramos/go/ch-2.go b/challenge-106/guillermo-ramos/go/ch-2.go
new file mode 100644
index 0000000000..4450841303
--- /dev/null
+++ b/challenge-106/guillermo-ramos/go/ch-2.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func getIntArg(i int) int {
+	if i >= len(os.Args) {
+		fmt.Println("Not enough arguments")
+		os.Exit(1)
+	}
+	v, err := strconv.Atoi(os.Args[i])
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	return v
+}
+
+type PerioDec struct {
+	digits       []int
+	periodicIdx int
+}
+
+func (d PerioDec) String() (s string) {
+	for i, v := range d.digits {
+		if i == 1 {
+			s = fmt.Sprint(s, ".")
+		}
+		if i == d.periodicIdx {
+			s = fmt.Sprint(s, "(")
+		}
+		s = fmt.Sprint(s, strconv.Itoa(v))
+	}
+	if d.periodicIdx != -1 {
+		s = fmt.Sprint(s, ")")
+	}
+	return
+}
+
+func main() {
+	n := getIntArg(1)
+	d := getIntArg(2)
+
+	dec := PerioDec{periodicIdx: -1}
+	numeratorIdxs := make(map[int]int)
+
+	maxDecimals := 20
+	for i := 0; i <= maxDecimals; i++ {
+		if idx, ok := numeratorIdxs[n]; ok && idx > 0 {
+			dec.periodicIdx = idx
+			break
+		}
+
+		q := 0
+		r := n
+		for r >= d {
+			r = r - d
+			q++
+		}
+
+		numeratorIdxs[n] = i
+		dec.digits = append(dec.digits, q)
+
+		n = r * 10
+
+		if r == 0 {
+			break
+		}
+
+	}
+
+	fmt.Println(dec)
+}
-- 
cgit