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The problem Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets are closed by ...
Question
python
#3: Post edited
by
Fie
·
2021-09-18T06:17:22Z (over 3 years ago)
Correct phrasing of bullet points; suggested more appropriate title.
Balanced parentheses problem in Python
- Detecting balanced parentheses in Python
- # The problem
- > Given a string s containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
- >
- > An input string is valid if:
- >
> 1. Open brackets must be closed by the same type of brackets.> 2. Open brackets must be closed in the correct order.- # The solution
- ```python
- def isValid(s: str) -> bool:
- if len(s) % 2 != 0:
- return False
- for i in range(len(s) // 2):
- s = s.replace("()", "").replace("[]", "").replace("{}", "")
- return len(s) == 0
- ```
- My approach to the problem is replacing the pairs. The string is balanced if the string is empty after replacing `len(str) // 2` times. Is this a good approach? How can I improve my algorithm?
- # The problem
- > Given a string s containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
- >
- > An input string is valid if:
- >
- > 1. Open brackets are closed by the same type of brackets.
- > 2. Open brackets are closed in the correct order.
- # The solution
- ```python
- def isValid(s: str) -> bool:
- if len(s) % 2 != 0:
- return False
- for i in range(len(s) // 2):
- s = s.replace("()", "").replace("[]", "").replace("{}", "")
- return len(s) == 0
- ```
- My approach to the problem is replacing the pairs. The string is balanced if the string is empty after replacing `len(str) // 2` times. Is this a good approach? How can I improve my algorithm?
#2: Post edited
by
Moshi
·
2021-06-15T22:03:53Z (over 3 years ago)
Added language to the code block for syntax highlighting
Balanced parentheses problem in Python
- # The problem
- > Given a string s containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
- >
- > An input string is valid if:
- >
- > 1. Open brackets must be closed by the same type of brackets.
- > 2. Open brackets must be closed in the correct order.
- # The solution
```- def isValid(s: str) -> bool:
- if len(s) % 2 != 0:
- return False
- for i in range(len(s) // 2):
- s = s.replace("()", "").replace("[]", "").replace("{}", "")
- return len(s) == 0
- ```
- My approach to the problem is replacing the pairs. The string is balanced if the string is empty after replacing `len(str) // 2` times. Is this a good approach? How can I improve my algorithm?
- # The problem
- > Given a string s containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
- >
- > An input string is valid if:
- >
- > 1. Open brackets must be closed by the same type of brackets.
- > 2. Open brackets must be closed in the correct order.
- # The solution
- ```python
- def isValid(s: str) -> bool:
- if len(s) % 2 != 0:
- return False
- for i in range(len(s) // 2):
- s = s.replace("()", "").replace("[]", "").replace("{}", "")
- return len(s) == 0
- ```
- My approach to the problem is replacing the pairs. The string is balanced if the string is empty after replacing `len(str) // 2` times. Is this a good approach? How can I improve my algorithm?
#1: Initial revision
by
justanotherpilgrim
·
2021-06-15T21:56:27Z (over 3 years ago)
Balanced parentheses problem in Python
# The problem
> Given a string s containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
>
> An input string is valid if:
>
> 1. Open brackets must be closed by the same type of brackets.
> 2. Open brackets must be closed in the correct order.
# The solution
```
def isValid(s: str) -> bool:
if len(s) % 2 != 0:
return False
for i in range(len(s) // 2):
s = s.replace("()", "").replace("[]", "").replace("{}", "")
return len(s) == 0
```
My approach to the problem is replacing the pairs. The string is balanced if the string is empty after replacing `len(str) // 2` times. Is this a good approach? How can I improve my algorithm?