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import java.util.Arrays;
public class ABC{
private static void swap(int i, int j, Object... arr){
Object tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
public static boolean canMakeWord(String word, String... blocks) {
if(word.length() == 0)
return true;
char c = Character.toUpperCase(word.charAt(0));
for(int i = 0; i < blocks.length; i++) {
String b = blocks[i];
if(Character.toUpperCase(b.charAt(0)) != c && Character.toUpperCase(b.charAt(1)) != c)
continue;
swap(0, i, blocks);
if(canMakeWord(word.substring(1), Arrays.copyOfRange(blocks, 1, blocks.length)))
return true;
swap(0, i, blocks);
}
return false;
}
public static void main(String[] args){
String[] blocks = {"BO", "XK", "DQ", "CP", "NA",
"GT", "RE", "TG", "QD", "FS",
"JW", "HU", "VI", "AN", "OB",
"ER", "FS", "LY", "PC", "ZM"};
System.out.println("\"\": " + canMakeWord("", blocks));
System.out.println("A: " + canMakeWord("A", blocks));
System.out.println("BARK: " + canMakeWord("BARK", blocks));
System.out.println("book: " + canMakeWord("book", blocks));
System.out.println("treat: " + canMakeWord("treat", blocks));
System.out.println("COMMON: " + canMakeWord("COMMON", blocks));
System.out.println("SQuAd: " + canMakeWord("SQuAd", blocks));
System.out.println("CONFUSE: " + canMakeWord("CONFUSE", blocks));
}
}
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