new files

Task/Best-shuffle/Go/best-shuffle.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+    "fmt"
+    "math/rand"
+    "time"
+)
+
+var ts = []string{"abracadabra", "seesaw", "elk", "grrrrrr", "up", "a"}
+
+func main() {
+    rand.Seed(time.Now().UnixNano())
+    for _, s := range ts {
+        // create shuffled byte array of original string
+        t := make([]byte, len(s))
+        for i, r := range rand.Perm(len(s)) {
+            t[i] = s[r]
+        }
+        // algorithm of Icon solution
+        for i := 0; i < len(s); i++ {
+            for j := 0; j < len(s); j++ {
+                if i != j && t[i] != s[j] && t[j] != s[i] {
+                    t[i], t[j] = t[j], t[i]
+                    break
+                }
+            }
+        }
+        // count unchanged and output
+        var count int
+        for i, ic := range t {
+            if ic == s[i] {
+                count++
+            }
+        }
+        fmt.Printf("%s -> %s (%d)\n", s, string(t), count)
+    }
+}