How to Solve Minimum Number of Chairs in a Waiting Room Problem
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Minimum Number of Chairs in a Waiting Room
You are given a string s. Simulate events at each second i: If s[i] == 'E', a person enters the waiting room and takes one of the chairs in it. If s[i] == 'L', a person leaves the waiting room, freein...
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Understanding the Minimum Number of Chairs in a Waiting Room Problem
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Problem Statement
You are given a string s. Simulate events at each second i: If s[i] == 'E', a person enters the waiting room and takes one of the chairs in it. If s[i] == 'L', a person leaves the waiting room, freeing up a chair. Return the minimum number of chairs needed so that a chair is available for every person who enters the waiting room given that it is initially empty.
Minimum Number of Chairs in a Waiting Room
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Examples
s = "EEEEEEE"7After each second, a person enters the waiting room and no person leaves it. Therefore, a minimum of 7 chairs is needed.
s = "ELELEEL"2Let's consider that there are 2 chairs in the waiting room. The table below shows the state of the waiting room at each second. Second Event People in the Waiting Room Available Chairs 0 Enter 1 1 1 Leave 0 2 2 Enter 1 1 3 Leave 0 2 4 Enter 1 1 5 Enter 2 0 6 Leave 1 1
s = "ELEELEELLL"3Let's consider that there are 3 chairs in the waiting room. The table below shows the state of the waiting room at each second. Second Event People in the Waiting Room Available Chairs 0 Enter 1 2 1 Leave 0 3 2 Enter 1 2 3 Enter 2 1 4 Leave 1 2 5 Enter 2 1 6 Enter 3 0 7 Leave 2 1 8 Leave 1 2 9 Leave 0 3
Constraints
1 <= s.length <= 50s consists only of the letters 'E' and 'L'.s represents a valid sequence of entries and exits.How Interview Coder Helps with Leetcode Problems
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