Initial data commit

Task/Move-to-front-algorithm/Go/move-to-front-algorithm.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+)
+
+type symbolTable string
+
+func (symbols symbolTable) encode(s string) []byte {
+	seq := make([]byte, len(s))
+	pad := []byte(symbols)
+	for i, c := range []byte(s) {
+		x := bytes.IndexByte(pad, c)
+		seq[i] = byte(x)
+		copy(pad[1:], pad[:x])
+		pad[0] = c
+	}
+	return seq
+}
+
+func (symbols symbolTable) decode(seq []byte) string {
+	chars := make([]byte, len(seq))
+	pad := []byte(symbols)
+	for i, x := range seq {
+		c := pad[x]
+		chars[i] = c
+		copy(pad[1:], pad[:x])
+		pad[0] = c
+	}
+	return string(chars)
+}
+
+func main() {
+	m := symbolTable("abcdefghijklmnopqrstuvwxyz")
+	for _, s := range []string{"broood", "bananaaa", "hiphophiphop"} {
+		enc := m.encode(s)
+		dec := m.decode(enc)
+		fmt.Println(s, enc, dec)
+		if dec != s {
+			panic("Whoops!")
+		}
+	}
+}