Data commit

Task/ABC-problem/Java/abc-problem.java

@@ -0,0 +1,36 @@
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class ABC {
+
+    public static void main(String[] args) {
+        List<String> blocks = Arrays.asList(
+                "BO", "XK", "DQ", "CP", "NA",
+                "GT", "RE", "TG", "QD", "FS",
+                "JW", "HU", "VI", "AN", "OB",
+                "ER", "FS", "LY", "PC", "ZM");
+
+        for (String word : Arrays.asList("", "A", "BARK", "BOOK", "TREAT", "COMMON", "SQUAD", "CONFUSE")) {
+            System.out.printf("%s: %s%n", word.isEmpty() ? "\"\"" : word, canMakeWord(word, blocks));
+        }
+    }
+
+    public static boolean canMakeWord(String word, List<String> blocks) {
+        if (word.isEmpty())
+            return true;
+
+        char c = word.charAt(0);
+        for (int i = 0; i < blocks.size(); i++) {
+            String b = blocks.get(i);
+            if (b.charAt(0) != c && b.charAt(1) != c)
+                continue;
+            Collections.swap(blocks, 0, i);
+            if (canMakeWord(word.substring(1), blocks.subList(1, blocks.size())))
+                return true;
+            Collections.swap(blocks, 0, i);
+        }
+
+        return false;
+    }
+}