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[ppxyn1] WEEK 06 solutions #2192

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[ppxyn1] WEEK 06 solutions #2192

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22 changes: 22 additions & 0 deletions valid-parentheses/ppxyn1.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
# idea : stack

class Solution:
def isValid(self, s: str) -> bool:
mapping = {"(": ")", "{": "}", "[": "]"}
stack = []

for ch in s:
if ch in mapping:
stack.append(ch)
else:
if not stack:
return False
if mapping[stack.pop()] != ch:
return False
if stack:
return False

return True