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Task/ABC-Problem/Python/abc-problem-1.py

@@ -0,0 +1,63 @@
+blocks = [("B", "O"),
+          ("X", "K"),
+          ("D", "Q"),
+          ("C", "P"),
+          ("N", "A"),
+          ("G", "T"),
+          ("R", "E"),
+          ("T", "G"),
+          ("Q", "D"),
+          ("F", "S"),
+          ("J", "W"),
+          ("H", "U"),
+          ("V", "I"),
+          ("A", "N"),
+          ("O", "B"),
+          ("E", "R"),
+          ("F", "S"),
+          ("L", "Y"),
+          ("P", "C"),
+          ("Z", "M")]
+
+
+def can_make_word(word, block_collection=blocks):
+    """
+    Return True if `word` can be made from the blocks in `block_collection`.
+
+    >>> can_make_word("")
+    False
+    >>> can_make_word("a")
+    True
+    >>> can_make_word("bark")
+    True
+    >>> can_make_word("book")
+    False
+    >>> can_make_word("treat")
+    True
+    >>> can_make_word("common")
+    False
+    >>> can_make_word("squad")
+    True
+    >>> can_make_word("coNFused")
+    True
+    """
+    if not word:
+        return False
+
+    blocks_remaining = block_collection[:]
+    for char in word.upper():
+        for block in blocks_remaining:
+            if char in block:
+                blocks_remaining.remove(block)
+                break
+        else:
+            return False
+    return True
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()
+    print(", ".join("'%s': %s" % (w, can_make_word(w)) for w in
+                    ["", "a", "baRk", "booK", "treat",
+                     "COMMON", "squad", "Confused"]))

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)))

Task/ABC-Problem/Python/abc-problem-3.py

@@ -0,0 +1,16 @@
+def mkword(w, b):
+    if not w: return []
+
+    c,w = w[0],w[1:]
+    for i in range(len(b)):
+        if c in b[i]:
+            m = mkword(w, b[0:i] + b[i+1:])
+            if m != None: return [b[i]] + m
+
+def abc(w, blk):
+    return mkword(w.upper(), [a.upper() for a in blk])
+
+blocks = 'BO XK DQ CP NA GT RE TG QD FS JW HU VI AN OB ER FS LY PC ZM'.split()
+
+for w in ", A, bark, book, treat, common, SQUAD, conFUsEd".split(', '):
+    print '\'' + w + '\'' + ' ->', abc(w, blocks)