Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Given a string containing just the characters
'C', ')', '{', '}', '[' and ']',
determine if the input string is valid.
The brackets must close in the correct order,
"()" and "()[{" are all valid but "(]" and "([)]" are not.
def is_valid(s: str)-> bool:
stack =
dic = {")": "(",
"}": "{",
"]": "["}
for char in s:
if char in dic.values():
stack.append(char)
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Transcribed Image Text:Given a string containing just the characters 'C', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[{" are all valid but "(]" and "([)]" are not. def is_valid(s: str)-> bool: stack = dic = {")": "(", "}": "{", "]": "["} for char in s: if char in dic.values(): stack.append(char)
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