number-of-senior-citizens

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Algorithms

You are given a 0-indexed array of strings <code>details</code>. Each element of <code>details</code> provides information about a given passenger compressed into a string of length <code>15</code>. The system is such that:

<ul>
	<li>The first ten characters consist of the phone number of passengers.</li>
	<li>The next character denotes the gender of the person.</li>
	<li>The following two characters are used to indicate the age of the person.</li>
	<li>The last two characters determine the seat allotted to that person.</li>
</ul>

Return the number of passengers who are strictly more than 60 years old.

&nbsp;
Example 1:

<pre>
Input: details = [&quot;7868190130M7522&quot;,&quot;5303914400F9211&quot;,&quot;9273338290F4010&quot;]
Output: 2
Explanation: The passengers at indices 0, 1, and 2 have ages 75, 92, and 40. Thus, there are 2 people who are over 60 years old.
</pre>

Example 2:

<pre>
Input: details = [&quot;1313579440F2036&quot;,&quot;2921522980M5644&quot;]
Output: 0
Explanation: None of the passengers are older than 60.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= details.length &lt;= 100</code></li>
	<li><code>details[i].length == 15</code></li>
	<li><code>details[i] consists of digits from &#39;0&#39; to &#39;9&#39;.</code></li>
	<li><code>details[i][10] is either &#39;M&#39; or &#39;F&#39; or &#39;O&#39;.</code></li>
	<li>The phone numbers and seat numbers of the passengers are distinct.</li>
</ul>

countSeniors

Number of Senior Citizens

Array

String

给你一个下标从 0&nbsp;开始的字符串&nbsp;<code>details</code>&nbsp;。<code>details</code>&nbsp;中每个元素都是一位乘客的信息，信息用长度为 <code>15</code>&nbsp;的字符串表示，表示方式如下：

<ul>
	<li>前十个字符是乘客的手机号码。</li>
	<li>接下来的一个字符是乘客的性别。</li>
	<li>接下来两个字符是乘客的年龄。</li>
	<li>最后两个字符是乘客的座位号。</li>
</ul>

请你返回乘客中年龄 严格大于 60 岁&nbsp;的人数。

&nbsp;

示例 1：

<pre>
输入：details = ["7868190130M7522","5303914400F9211","9273338290F4010"]
输出：2
解释：下标为 0 ，1 和 2 的乘客年龄分别为 75 ，92 和 40 。所以有 2 人年龄大于 60 岁。
</pre>

示例 2：

<pre>
输入：details = ["1313579440F2036","2921522980M5644"]
输出：0
解释：没有乘客的年龄大于 60 岁。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= details.length &lt;= 100</code></li>
	<li><code>details[i].length == 15</code></li>
	<li><code>details[i]</code>&nbsp;中的数字只包含&nbsp;<code>'0'</code>&nbsp;到&nbsp;<code>'9'</code>&nbsp;。</li>
	<li><code>details[i][10]</code>&nbsp;是 <code>'M'</code>&nbsp;，<code>'F'</code>&nbsp;或者&nbsp;<code>'O'</code>&nbsp;之一。</li>
	<li>所有乘客的手机号码和座位号互不相同。</li>
</ul>