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g2601_2700.s2678_number_of_senior_citizens.readme.md Maven / Gradle / Ivy

2678\. Number of Senior Citizens

Easy

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

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

Return _the number of passengers who are **strictly** **more than 60 years old**._

**Example 1:**

**Input:** details = ["7868190130M7522","5303914400F9211","9273338290F4010"]

**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.

**Example 2:**

**Input:** details = ["1313579440F2036","2921522980M5644"]

**Output:** 0

**Explanation:** None of the passengers are older than 60.

**Constraints:**

*   `1 <= details.length <= 100`
*   `details[i].length == 15`
*   `details[i] consists of digits from '0' to '9'.`
*   `details[i][10] is either 'M' or 'F' or 'O'.`
*   The phone numbers and seat numbers of the passengers are distinct.