Question: 2. (Hint: stack) Given a string containing just the characters '(,'',{', '},'' and 'l', determine if the input string is valid in O(n) time. The

2. (Hint: stack) Given a string containing just the characters '(,'',{', '},'' and 'l', determine if the input string is valid in O(n) time. The brackets must close in the correct order, "O" and "Ol()" are all valid but "C" and "(D]" are not. Example: Input: "D" Input: "000" Output: False Output: True

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