from a given string of having parenthesis determining is it a valid parenthesis or not !
Sample Input::
----- --------
3 n = 3
{[()]} first s = '{[()]}'
{[(])} second s = '{[(])}'
{{[[(())]]}} third s ='{{[[(())]]}}'
Sample Output:
YES
NO
YES
Explanation
The string {[()]} meets both criteria for being a balanced string.
The string {[(])} is not balanced because the brackets enclosed by the matched pair { and } are not balanced: [(]).
The string {{[[(())]]}} meets both criteria for being a balanced string.
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