class Solution2():
def count_unique_subsequence(self, s, start, dest, n):
def count_unique(s, index, curr, dest, n, d):
if (index, curr) in d:
return d[(index, curr)]
result = set([])
if index == len(s):
return result
result.update(count_unique(s, index + 1, curr, dest, n, d))
if s[index] == 'l':
if curr > 0:
next_loc = curr - 1
if next_loc == dest:
result.add('l')
for r in count_unique(s, index + 1, next_loc, dest, n, d):
result.add('l' + r)
else:
if curr + 1 < n:
next_loc = curr + 1
if next_loc == dest:
result.add('r')
for r in (count_unique(s, index + 1, next_loc, dest, n, d)):
result.add('r' + r)
d[(index, curr)] = result
return result
return len(count_unique(s, 0, start, dest, n, {}))
s = Solution2()
s.count_unique_subsequence('rrlrlr', 1, 2, 6)
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}