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2678. Number of Senior Citizens 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  int countSeniors(vector<string>& details) {
    return ranges::count_if(details, [](const string& detail) {
      return stoi(detail.substr(11, 2)) > 60;
    });
  }
};

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class Solution {
  public int countSeniors(String[] details) {
    return (int) Arrays.stream(details)
        .filter(detail -> Integer.parseInt(detail.substring(11, 13)) > 60)
        .count();
  }
}

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class Solution:
  def countSeniors(self, details: list[str]) -> int:
    return sum(int(detail[11:13]) > 60 for detail in details)