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# Untitled

a guest Sep 21st, 2018 62 Never
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1. """
2. Description:
3. Remove the minimum number of invalid parentheses in order to make the input string
4. valid. Return all possible results. The input string may contain letters other than
5. the parentheses ( and ).
6.
7. Examples:
8. Input: "()())()"
9. Output: ["()()()", "(())()"]
10.
11. Input: "(a)())()"
12. Output: ["(a)()()", "(a())()"]
13.
14. Input: ")("
15. Output: [""]
16. """
17.
18. def removeInvalidParentheses2(s):
19.     """
20.     :type s: str
21.     :rtype: List[str]
22.     """
23.     def remove(s, last_i, last_j, parens, result):
24.         i, count = last_i, 0
25.         while i < len(s):
26.             if s[i] == parens[0]:
27.                 count += 1
28.             elif s[i] == parens[1]:
29.                 count -= 1
30.             if count >= 0:
31.                 i += 1
32.                 continue
33.             j = last_j
34.             while j <= i:
35.                 if s[j] == parens[1] and (j == last_j or s[j-1] != s[j]):
36.                     remove(s[:j] + s[j+1:], i, j, parens, result)
37.                 j += 1
38.             return
39.         if parens[1] == ')':
40.             remove(s[::-1], 0, 0, (')', '('), result)
41.         else:
42.             result.append(s[::-1])
43.     result = []
44.     remove(s, 0, 0, ('(', ')'), result)
45.     return result
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