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Can you solve this real interview question? Valid Parentheses - Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid …

Can you solve this real interview question? Time Needed to Buy Tickets - There are n people in a line queuing to buy tickets, where the 0th person is at the front of the line and the (n - 1)th …

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