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Use stack to match closing brackets with their corresponding opening brackets.
Example:
Input:
s='([)]'Output:
false (wrong order)Common Mistakes:
- Not checking if stack is empty before popping
- Forgetting to check stack is empty at end
- Using if-else chains instead of map for cleaner code
- Not handling interleaved brackets like '([)]'
Notes:
Classic stack problem. Time O(n), Space O(n). Foundation for more complex parsing problems.
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Use stack to match closing brackets with their corresponding opening brackets.
Example:
Input:
s='([)]'Output:
false (wrong order)Common Mistakes:
- Not checking if stack is empty before popping
- Forgetting to check stack is empty at end
- Using if-else chains instead of map for cleaner code
- Not handling interleaved brackets like '([)]'
Notes:
Classic stack problem. Time O(n), Space O(n). Foundation for more complex parsing problems.
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Valid Parentheses