This content originally appeared on DEV Community and was authored by MD ARIFUL HAQUE
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 <= 100details[i].length == 15details[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.
Hint:
- Convert the value at index
11and12to a numerical value. - The age of the person at index i is equal to
details[i][11]*10+details[i][12].
Solution:
To solve this problem, we can follow these steps:
- Extract the Age: The age is located at the 12th and 13th positions in each string.
- Convert to Integer: Convert the extracted age substring to an integer.
- Count Senior Citizens: Count how many of these ages are strictly greater than 60.
Let's implement this solution in PHP: 2678. Number of Senior Citizens
<?php
// Example usage:
$details1 = ["7868190130M7522","5303914400F9211","9273338290F4010"];
$details2 = ["1313579440F2036","2921522980M5644"];
echo countSeniorCitizens($details1); // Output: 2
echo countSeniorCitizens($details2); // Output: 0
?>
Explanation:
-
Function Definition: The function
countSeniorCitizenstakes an array of stringsdetailsas input. -
Initialize Counter: We initialize a counter
$seniorCountto keep track of the number of senior citizens. -
Loop Through Each Detail: We loop through each element in the
detailsarray. -
Extract Age: For each detail string, we extract the substring from index 11 to 12 (2 characters) and convert it to an integer using
intval. - Check Age Condition: We check if the extracted age is strictly greater than 60.
-
Increment Counter: If the condition is true, we increment the
$seniorCount. - Return Count: After looping through all the details, we return the count of senior citizens.
Testing:
- For the input
["7868190130M7522","5303914400F9211","9273338290F4010"], the output is2because the ages are 75, 92, and 40, with 75 and 92 being greater than 60. - For the input
["1313579440F2036","2921522980M5644"], the output is0because the ages are 20 and 56, neither of which are greater than 60.
This solution is efficient and straightforward, working within the constraints provided.
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This content originally appeared on DEV Community and was authored by MD ARIFUL HAQUE
MD ARIFUL HAQUE | Sciencx (2024-08-01T18:06:17+00:00) 2678. Number of Senior Citizens. Retrieved from https://www.scien.cx/2024/08/01/2678-number-of-senior-citizens/
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