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  1. def f(s):
  2.     stack = []
  3.     invalid_count = 0
  4.     pair = {')': '(', ']': '[', '}': '{'}
  5.  
  6.     for ch in s:
  7.         if ch in "([{":
  8.             stack.append(ch)
  9.         elif ch in ")]}":
  10.             if stack and stack[-1] == pair[ch]:
  11.                 stack.pop()
  12.             else:
  13.                 invalid_count += 1  # unmatched or mistyped closing bracket
  14.  
  15.     return invalid_count + len(stack)
  16.  
  17. s = "( [ { ] )"
  18. print(f(s))
Success #stdin #stdout 0.08s 14192KB
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https://ideone.com/4RKyDE
language:
Python 3 (python  3.12)
created:
8 hours ago
visibility:
public

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