Package g2601_2700.s2678_number_of_senior_citizens

Class Solution

  • public class Solution
extends Object
    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.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • countSeniors

        public int countSeniors​(String[] details)