Data commit

Task/Perfect-shuffle/Go/perfect-shuffle.go

@@ -0,0 +1,59 @@
+package main
+
+import "fmt"
+
+type Deck struct {
+	Cards []int
+	length int
+}
+
+func NewDeck(deckSize int) (res *Deck){
+	if deckSize % 2 != 0{
+		panic("Deck size must be even")
+	}
+	res = new(Deck)
+	res.Cards = make([]int, deckSize)
+	res.length = deckSize
+	for i,_ := range  res.Cards{
+		res.Cards[i] = i
+	}
+	return
+}
+func (d *Deck)shuffleDeck(){
+	tmp := make([]int,d.length)
+	for i := 0;i <d.length/2;i++  {
+		tmp[i*2] = d.Cards[i]
+		tmp[i*2+1] = d.Cards[d.length / 2 + i]
+	}
+	d.Cards = tmp
+}
+func (d *Deck) isEqualTo(c Deck) (res bool) {
+	if d.length != c.length {
+		panic("Decks aren't equally sized")
+	}
+	res = true
+	for i, v := range d.Cards{
+		if v != c.Cards[i] {
+			res = false
+		}
+	}
+	return
+}
+
+
+func main(){
+	for _,v := range []int{8,24,52,100,1020,1024,10000} {
+		fmt.Printf("Cards count: %d, shuffles required: %d\n",v,ShufflesRequired(v))
+	}
+}
+
+func ShufflesRequired(deckSize int)(res int){
+	deck := NewDeck(deckSize)
+	Ref := *deck
+	deck.shuffleDeck()
+	res++
+	for ;!deck.isEqualTo(Ref);deck.shuffleDeck(){
+		res++
+	}
+	return
+}