pwc148 solution in go

8 files changed, 353 insertions, 0 deletions

diff --git a/challenge-148/pokgopun/README b/challenge-148/pokgopun/README
new file mode 100644
index 0000000000..33dfd303a4
--- /dev/null
+++ b/challenge-148/pokgopun/README
@@ -0,0 +1 @@
+Solution by PokGoPun
diff --git a/challenge-148/pokgopun/go/ch-1.go b/challenge-148/pokgopun/go/ch-1.go
new file mode 100644
index 0000000000..d387fd2e5b
--- /dev/null
+++ b/challenge-148/pokgopun/go/ch-1.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/divan/num2words"
+)
+
+func main() {
+	eban := []int{}
+	re := regexp.MustCompile(`[eE]`)
+	for i := 1; i <= 100; i++ {
+		if !re.MatchString(num2words.Convert(i)) {
+			eban = append(eban, i)
+		}
+	}
+	fmt.Println(eban)
+}
diff --git a/challenge-148/pokgopun/go/ch-2.go b/challenge-148/pokgopun/go/ch-2.go
new file mode 100644
index 0000000000..5c3c3bb22d
--- /dev/null
+++ b/challenge-148/pokgopun/go/ch-2.go
@@ -0,0 +1,152 @@
+// From https://math.stackexchange.com/questions/1885095/parametrization-of-cardano-triplet
+// a = 3k + 2
+// b^2 * c = (k+1)^2 * (8k + 5)
+package main
+
+import (
+	"fmt"
+	"math"
+	"sort"
+	"strings"
+)
+
+func main() {
+	cdn := newCdn3(400)
+	fmt.Println(cdn)
+}
+
+func pmap(n uint) []bool {
+	m := make([]bool, int(n)+1)
+	for i := 2; i <= int(n); i++ {
+		m[i] = true
+	}
+	for i := 2; float64(i) <= math.Sqrt(float64(n)); i++ {
+		j := i * i
+		for j <= int(n) {
+			m[j] = false
+			j += i
+		}
+
+	}
+	return m
+}
+
+type cdn3 struct {
+	k     uint
+	pmap  []bool
+	plist []int
+}
+
+func newCdn3(n uint) (c cdn3) {
+	c.k = n
+	// create prime map as large as sqrt of (8k + 5) which is the term we need to do factoriing
+	//c.pmap = pmap(uint(math.Floor(math.Sqrt(float64(8*n) + 5))))
+	// create prime map as large as (8k + 5) to make it easy to check prime for factoring the number
+	c.pmap = pmap(uint((8 * n) + 5))
+	for i := 2; i < len(c.pmap); i++ {
+		if c.pmap[i] {
+			c.plist = append(c.plist, i)
+		}
+	}
+	return c
+}
+
+func (cdn cdn3) a(k uint) int {
+	return int(3*k + 2)
+}
+
+func (cdn cdn3) bc(k uint) (s [][2]int) {
+	b := int(k + 1)
+	c := int(8*k + 5)
+	//bIsPrime := big.NewInt(int64(b)).ProbablyPrime(10)
+	//cIsPrime := big.NewInt(int64(c)).ProbablyPrime(10)
+	s = append(s, [2]int{1, b * b * c})
+	factor := []int{}
+	if cdn.pmap[c] {
+		if b == 1 {
+			return s
+		}
+		if cdn.pmap[b] {
+			s = append(s, [2]int{b, c})
+			return s
+		} else {
+			factor = append(factor, cdn.factor(b)...)
+			factor = append(factor, factor...)
+			factor = append(factor, c)
+		}
+	} else {
+		if cdn.pmap[b] {
+			factor = append(factor, b, b)
+		} else {
+			factor = append(factor, cdn.factor(b)...)
+			factor = append(factor, factor...)
+		}
+		factor = append(factor, cdn.factor(c)...)
+	}
+	sort.SliceStable(factor, func(i, j int) bool {
+		return factor[i] < factor[j]
+	})
+	fmt.Println("b =", b, "c =", c, "factor =>", factor, len(factor))
+	var (
+		prev       int
+		pair, lone []int
+	)
+	for _, v := range factor {
+		if prev == v {
+			pair = append(pair, v)
+			prev = 0
+		} else if prev == 0 {
+			prev = v
+		} else {
+			lone = append(lone, prev)
+			prev = v
+		}
+	}
+	if prev != 0 {
+		lone = append(lone, prev)
+	}
+	fmt.Println("factor =>", "pair =", pair, "lone =", lone)
+	return s
+}
+
+func (cdn cdn3) factor(n int) (s []int) {
+	if n > 1 {
+		if cdn.pmap[n] {
+			return []int{n}
+		}
+		i := 0
+		for {
+			if n%cdn.plist[i] != 0 {
+				i++
+			} else {
+				s = append(s, cdn.plist[i])
+				n /= cdn.plist[i]
+				if n == 1 {
+					break
+				} else if cdn.pmap[n] {
+					s = append(s, n)
+					break
+				}
+			}
+		}
+	}
+	return s
+}
+
+func (cdn cdn3) abc(k uint) (s [][3]int) {
+	for _, v := range cdn.bc(k) {
+		s = append(s, [3]int{cdn.a(k), v[0], v[1]})
+	}
+	return s
+}
+
+func (cdn cdn3) String() string {
+	var b strings.Builder
+	for k := 0; k <= int(cdn.k); k++ {
+		for _, v := range cdn.abc(uint(k)) {
+			//fmt.Println(v)
+			b.WriteString(fmt.Sprintln(v))
+		}
+	}
+	return b.String()
+}
diff --git a/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/.travis.yml b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/.travis.yml
new file mode 100644
index 0000000000..03ca914415
--- /dev/null
+++ b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/.travis.yml
@@ -0,0 +1,8 @@
+language: go
+go: 
+ - 1.8.3
+ - 1.9
+
+
+script:
+ - go test -v .
diff --git a/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/LICENSE b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/LICENSE
new file mode 100644
index 0000000000..635f49f003
--- /dev/null
+++ b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Ivan Daniluk
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/README.md b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/README.md
new file mode 100644
index 0000000000..8197c11925
--- /dev/null
+++ b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/README.md
@@ -0,0 +1,29 @@
+num2words
+=========
+
+[![Build Status](https://travis-ci.org/divan/num2words.svg?branch=master)](https://travis-ci.org/divan/num2words)
+[![GoDoc](https://godoc.org/github.com/divan/num2words?status.svg)](https://godoc.org/github.com/divan/num2words)
+
+num2words - Numbers to words converter in Go (Golang)
+
+## Usage
+
+First, import package num2words
+
+```import github.com/divan/num2words```
+
+Convert number
+```go
+  str := num2words.Convert(17) // outputs "seventeen"
+  ...
+  str := num2words.Convert(1024) // outputs "one thousand twenty four"
+  ...
+  str := num2words.Convert(-123) // outputs "minus one hundred twenty three"
+```
+
+Convert number with " and " between number groups:
+```go
+  str := num2words.ConvertAnd(514) // outputs "five hundred and fourteen"
+  ...
+  str := num2words.ConvertAnd(123) // outputs "one hundred and twenty three"
+```
diff --git a/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/num2words.go b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/num2words.go
new file mode 100644
index 0000000000..dc86854c6b
--- /dev/null
+++ b/challenge-148/pokgopun/go/vendor/github.com/divan/num2words/num2words.go
@@ -0,0 +1,119 @@
+// Package num2words implements numbers to words converter.
+package num2words
+
+import "math"
+
+// how many digit's groups to process
+const groupsNumber int = 4
+
+var _smallNumbers = []string{
+	"zero", "one", "two", "three", "four",
+	"five", "six", "seven", "eight", "nine",
+	"ten", "eleven", "twelve", "thirteen", "fourteen",
+	"fifteen", "sixteen", "seventeen", "eighteen", "nineteen",
+}
+var _tens = []string{
+	"", "", "twenty", "thirty", "forty", "fifty",
+	"sixty", "seventy", "eighty", "ninety",
+}
+var _scaleNumbers = []string{
+	"", "thousand", "million", "billion",
+}
+
+type digitGroup int
+
+// Convert converts number into the words representation.
+func Convert(number int) string {
+	return convert(number, false)
+}
+
+// ConvertAnd converts number into the words representation
+// with " and " added between number groups.
+func ConvertAnd(number int) string {
+	return convert(number, true)
+}
+
+func convert(number int, useAnd bool) string {
+	// Zero rule
+	if number == 0 {
+		return _smallNumbers[0]
+	}
+
+	// Divide into three-digits group
+	var groups [groupsNumber]digitGroup
+	positive := math.Abs(float64(number))
+
+	// Form three-digit groups
+	for i := 0; i < groupsNumber; i++ {
+		groups[i] = digitGroup(math.Mod(positive, 1000))
+		positive /= 1000
+	}
+
+	var textGroup [groupsNumber]string
+	for i := 0; i < groupsNumber; i++ {
+		textGroup[i] = digitGroup2Text(groups[i], useAnd)
+	}
+	combined := textGroup[0]
+	and := useAnd && (groups[0] > 0 && groups[0] < 100)
+
+	for i := 1; i < groupsNumber; i++ {
+		if groups[i] != 0 {
+			prefix := textGroup[i] + " " + _scaleNumbers[i]
+
+			if len(combined) != 0 {
+				prefix += separator(and)
+			}
+
+			and = false
+
+			combined = prefix + combined
+		}
+	}
+
+	if number < 0 {
+		combined = "minus " + combined
+	}
+
+	return combined
+}
+
+func intMod(x, y int) int {
+	return int(math.Mod(float64(x), float64(y)))
+}
+
+func digitGroup2Text(group digitGroup, useAnd bool) (ret string) {
+	hundreds := group / 100
+	tensUnits := intMod(int(group), 100)
+
+	if hundreds != 0 {
+		ret += _smallNumbers[hundreds] + " hundred"
+
+		if tensUnits != 0 {
+			ret += separator(useAnd)
+		}
+	}
+
+	tens := tensUnits / 10
+	units := intMod(tensUnits, 10)
+
+	if tens >= 2 {
+		ret += _tens[tens]
+
+		if units != 0 {
+			ret += "-" + _smallNumbers[units]
+		}
+	} else if tensUnits != 0 {
+		ret += _smallNumbers[tensUnits]
+	}
+
+	return
+}
+
+// separator returns proper separator string between
+// number groups.
+func separator(useAnd bool) string {
+	if useAnd {
+		return " and "
+	}
+	return " "
+}
diff --git a/challenge-148/pokgopun/go/vendor/modules.txt b/challenge-148/pokgopun/go/vendor/modules.txt
new file mode 100644
index 0000000000..a8da285050
--- /dev/null
+++ b/challenge-148/pokgopun/go/vendor/modules.txt
@@ -0,0 +1,5 @@
+# github.com/divan/num2words v0.0.0-20170904212200-57dba452f942
+## explicit
+github.com/divan/num2words
+# github.com/smartystreets/goconvey v1.7.2
+## explicit; go 1.16