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"title": "Minimum Number of Chairs in a Waiting Room",
"titleSlug": "minimum-number-of-chairs-in-a-waiting-room",
"content": "<p>You are given a string <code>s</code>. Simulate events at each second <code>i</code>:</p>\n\n<ul>\n\t<li>If <code>s[i] == &#39;E&#39;</code>, a person enters the waiting room and takes one of the chairs in it.</li>\n\t<li>If <code>s[i] == &#39;L&#39;</code>, a person leaves the waiting room, freeing up a chair.</li>\n</ul>\n\n<p>Return the <strong>minimum </strong>number of chairs needed so that a chair is available for every person who enters the waiting room given that it is initially <strong>empty</strong>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;EEEEEEE&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">7</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>After each second, a person enters the waiting room and no person leaves it. Therefore, a minimum of 7 chairs is needed.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;ELELEEL&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Let&#39;s consider that there are 2 chairs in the waiting room. The table below shows the state of the waiting room at each second.</p>\n</div>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>Second</th>\n\t\t\t<th>Event</th>\n\t\t\t<th>People in the Waiting Room</th>\n\t\t\t<th>Available Chairs</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>0</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>1</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>1</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>0</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>2</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>1</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>3</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>0</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>4</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>1</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>5</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>2</td>\n\t\t\t<td>0</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>6</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>1</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t</tbody>\n</table>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;ELEELEELLL&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Let&#39;s consider that there are 3 chairs in the waiting room. The table below shows the state of the waiting room at each second.</p>\n</div>\n\n<table>\n\t<tbody>\n\t\t<tr>\n\t\t\t<th>Second</th>\n\t\t\t<th>Event</th>\n\t\t\t<th>People in the Waiting Room</th>\n\t\t\t<th>Available Chairs</th>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>0</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>1</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>1</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>0</td>\n\t\t\t<td>3</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>2</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>1</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>3</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>2</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>4</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>1</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>5</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>2</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>6</td>\n\t\t\t<td>Enter</td>\n\t\t\t<td>3</td>\n\t\t\t<td>0</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>7</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>2</td>\n\t\t\t<td>1</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>8</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>1</td>\n\t\t\t<td>2</td>\n\t\t</tr>\n\t\t<tr>\n\t\t\t<td>9</td>\n\t\t\t<td>Leave</td>\n\t\t\t<td>0</td>\n\t\t\t<td>3</td>\n\t\t</tr>\n\t</tbody>\n</table>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 50</code></li>\n\t<li><code>s</code> consists only of the letters <code>&#39;E&#39;</code> and <code>&#39;L&#39;</code>.</li>\n\t<li><code>s</code> represents a valid sequence of entries and exits.</li>\n</ul>\n",
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"Iterate from left to right over the string and keep track of the number of people in the waiting room using a variable that you will increment on every occurrence of ‘E’ and decrement on every occurrence of ‘L’.",
"The answer is the maximum number of people in the waiting room at any instance."
],
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