Data commit

Task/Best-shuffle/Kotlin/best-shuffle.kotlin

@@ -0,0 +1,37 @@
+import java.util.Random
+
+object BestShuffle {
+    operator fun invoke(s1: String) : String {
+        val s2 = s1.toCharArray()
+        s2.shuffle()
+        for (i in s2.indices)
+            if (s2[i] == s1[i])
+                for (j in s2.indices)
+                    if (s2[i] != s2[j] && s2[i] != s1[j] && s2[j] != s1[i]) {
+                        val tmp = s2[i]
+                        s2[i] = s2[j]
+                        s2[j] = tmp
+                        break
+                    }
+        return s1 + ' ' + String(s2) + " (" + s2.count(s1) + ')'
+    }
+
+    private fun CharArray.shuffle() {
+        val rand = Random()
+        for (i in size - 1 downTo 1) {
+            val r = rand.nextInt(i + 1)
+            val tmp = this[i]
+            this[i] = this[r]
+            this[r] = tmp
+        }
+    }
+
+    private fun CharArray.count(s1: String) : Int {
+        var count = 0
+        for (i in indices)
+            if (s1[i] == this[i]) count++
+        return count
+    }
+}
+
+fun main(words: Array<String>) = words.forEach { println(BestShuffle(it)) }