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1154. Day of the Year 👎

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class Solution {
 public:
  int dayOfYear(string date) {
    int year = stoi(date.substr(0, 4));
    int month = stoi(date.substr(5, 2));
    int day = stoi(date.substr(8));
    vector<int> days = {
        31, isLeapYear(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    return accumulate(days.begin(), days.begin() + month - 1, 0) + day;
  }

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

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class Solution {
  public int dayOfYear(String date) {
    int ans = 0;
    int year = Integer.valueOf(date.substring(0, 4));
    int month = Integer.valueOf(date.substring(5, 7));
    int day = Integer.valueOf(date.substring(8));
    int[] days = new int[] {31, isLeapYear(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    for (int i = 0; i < month - 1; ++i)
      ans += days[i];

    return ans + day;
  }

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

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class Solution:
  def dayOfYear(self, date: str) -> int:
    def isLeapYear(year: int) -> bool:
      return (year % 4 == 0 and year % 100 != 0) or year % 400 == 0

    year = int(date[:4])
    month = int(date[5:7])
    day = int(date[8:])
    days = [31, 29 if isLeapYear(
        year) else 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    return sum(days[:month - 1]) + day