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1118. Number of Days in a Month 👎

  • Time: $O(1)$
  • Space: $O(1)$
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class Solution {
 public:
  int numberOfDays(int year, int month) {
    const vector<int> days = {0,  31, 28, 31, 30, 31, 30,
                              31, 31, 30, 31, 30, 31};
    return month == 2 && isLeapYear(year) ? 29 : days[month];
  }

 private:
  bool isLeapYear(int year) {
    return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
  };
};

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class Solution {
  public int numberOfDays(int year, int month) {
    final int[] days = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    return month == 2 && isLeapYear(year) ? 29 : days[month];
  }

  private boolean isLeapYear(int year) {
    return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
  }
}

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class Solution:
  def numberOfDays(self, year: int, month: int) -> int:
    days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    def isLeapYear(year: int) -> bool:
      return year % 4 == 0 and year % 100 != 0 or year % 400 == 0
    return 29 if month == 2 and isLeapYear(year) else days[month]