CodePython/20. Valid Parentheses.py at master · SaiSujithReddy/CodePython · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
class Solution:
    def isValid(self, s):
        """
        :type s: str
        :rtype: bool
        """
        dict_parentesis = {"}":"{", ")":"(",">":"<","]":"[" }

        stack = []
        for char in s:
            if len(stack) == 0:
                stack.append(char)
            else:
                # temp =
                #print()
                if char in dict_parentesis:
                    if dict_parentesis[char] == stack[-1]:
                        stack.pop()
                    else:
                        stack.append(char)
                else:
                    stack.append(char)
        if len(stack) == 0:
            return True
        else:
            return False

        #return True


sol = Solution()

z_list = ["()","()[]{}","(]","([)]","{[]}"]
for z in z_list:
    print(sol.isValid(z))


'''
Time - O(n)
Space - O(n)

'''