2016 Update

Task/ABC-Problem/Kotlin/abc-problem.kotlin

@@ -0,0 +1,39 @@
+package abc
+
+object ABC_block_checker {
+    fun run() {
+        val blocks = arrayOf("BO", "XK", "DQ", "CP", "NA", "GT", "RE", "TG", "QD", "FS",
+                "JW", "HU", "VI", "AN", "OB", "ER", "FS", "LY", "PC", "ZM")
+
+        println("\"\": " + blocks.canMakeWord(""))
+        val words = arrayOf("A", "BARK", "book", "treat", "COMMON", "SQuAd", "CONFUSE")
+        for (w in words)  println("$w: " + blocks.canMakeWord(w))
+    }
+
+    private fun Array<String>.swap(i: Int, j: Int) {
+        val tmp = this[i]
+        this[i] = this[j]
+        this[j] = tmp
+    }
+
+    private fun Array<String>.canMakeWord(word: String): Boolean {
+        if (word.length == 0)
+            return true
+
+        val c = Character.toUpperCase(word.first())
+        var i = 0
+        forEach { b ->
+            if (b.first().toUpperCase() == c || b[1].toUpperCase() == c) {
+                swap(0, i)
+                if (drop(1).toTypedArray().canMakeWord(word.substring(1)))
+                    return true
+                swap(0, i)
+            }
+            i++
+        }
+
+        return false
+    }
+}
+
+fun main(args: Array<String>) = ABC_block_checker.run()