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Task/ABC-Problem/Python/abc-problem-2.py

@@ -0,0 +1,25 @@
+BLOCKS = 'BO XK DQ CP NA GT RE TG QD FS JW HU VI AN OB ER FS LY PC ZM'.split()
+
+def _abc(word, blocks):
+    for i, ch in enumerate(word):
+        for blk in (b for b in blocks if ch in b):
+            whatsleft = word[i + 1:]
+            blksleft = blocks[:]
+            blksleft.remove(blk)
+            if not whatsleft:
+                return True, blksleft
+            if not blksleft:
+                return False, blksleft
+            ans, blksleft = _abc(whatsleft, blksleft)
+            if ans:
+                return ans, blksleft
+        else:
+            break
+    return False, blocks
+
+def abc(word, blocks=BLOCKS):
+    return _abc(word.upper(), blocks)[0]
+
+if __name__ == '__main__':
+    for word in [''] + 'A BARK BoOK TrEAT COmMoN SQUAD conFUsE'.split():
+        print('Can we spell %9r? %r' % (word, abc(word)))