Welcome to Subscribe On Youtube

Formatted question description: https://leetcode.ca/all/1154.html

1154. Day of the Year (Easy)

Given a string date representing a Gregorian calendar date formatted as YYYY-MM-DD, return the day number of the year.

 

Example 1:

Input: date = "2019-01-09"
Output: 9
Explanation: Given date is the 9th day of the year in 2019.

Example 2:

Input: date = "2019-02-10"
Output: 41

Example 3:

Input: date = "2003-03-01"
Output: 60

Example 4:

Input: date = "2004-03-01"
Output: 61

 

Constraints:

• date.length == 10
• date[4] == date[7] == '-', and all other date[i]'s are digits
• date represents a calendar date between Jan 1st, 1900 and Dec 31, 2019.

Related Topics:
Math

Solution 1.

• Java
• C++
• Python
• Go
• Javascript

• class Solution {
      public int dayOfYear(String date) {
          String[] array = date.split("-");
          int year = Integer.parseInt(array[0]), month = Integer.parseInt(array[1]), day = Integer.parseInt(array[2]);
          if (month == 1)
              return day;
          if (month == 2)
              return 31 + day;
          int leap = (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? 1 : 0;
          int dayOfYear = 31 + 28 + leap;
          if (month > 3)
              dayOfYear += 31;
          if (month > 4)
              dayOfYear += 30;
          if (month > 5)
              dayOfYear += 31;
          if (month > 6)
              dayOfYear += 30;
          if (month > 7)
              dayOfYear += 31;
          if (month > 8)
              dayOfYear += 31;
          if (month > 9)
              dayOfYear += 30;
          if (month > 10)
              dayOfYear += 31;
          if (month > 11)
              dayOfYear += 30;
          dayOfYear += day;
          return dayOfYear;
      }
  }
  
  ############
  
  class Solution {
      public int dayOfYear(String date) {
          int y = Integer.parseInt(date.substring(0, 4));
          int m = Integer.parseInt(date.substring(5, 7));
          int d = Integer.parseInt(date.substring(8));
          int v = y % 400 == 0 || (y % 4 == 0 && y % 100 != 0) ? 29 : 28;
          int[] days = {31, v, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
          int ans = d;
          for (int i = 0; i < m - 1; ++i) {
              ans += days[i];
          }
          return ans;
      }
  }
  

• // OJ: https://leetcode.com/problems/day-of-the-year/
  // Time: O(1)
  // Space: O(1)
  class Solution {
      const int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
      bool isLeap(int y) {
          return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
      }
  public:
      int dayOfYear(string date) {
          int y = stoi(date.substr(0, 4)), m = stoi(date.substr(5, 2)), d = stoi(date.substr(8));
          return (m > 2 && isLeap(y)) + accumulate(begin(days), begin(days) + m - 1, 0) + d;
      }
  };
  

• class Solution:
      def dayOfYear(self, date: str) -> int:
          y, m, d = (int(s) for s in date.split('-'))
          v = 29 if y % 400 == 0 or (y % 4 == 0 and y % 100) else 28
          days = [31, v, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
          return sum(days[: m - 1]) + d
  
  ############
  
  # 1154. Day of the Year
  # https://leetcode.com/problems/day-of-the-year/
  
  from datetime import datetime
  
  class Solution:
      def dayOfYear(self, date: str) -> int:
          f = "%Y-%m-%d"
          dt = datetime.strptime(date, f)
          res = dt.timetuple().tm_yday        
          
          return res
  
  

• func dayOfYear(date string) (ans int) {
  	y, _ := strconv.Atoi(date[:4])
  	m, _ := strconv.Atoi(date[5:7])
  	d, _ := strconv.Atoi(date[8:])
  	days := []int{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
  	if y%400 == 0 || (y%4 == 0 && y%100 != 0) {
  		days[1] = 29
  	}
  	ans += d
  	for _, v := range days[:m-1] {
  		ans += v
  	}
  	return
  }
  

• /**
   * @param {string} date
   * @return {number}
   */
  var dayOfYear = function (date) {
      const y = +date.slice(0, 4);
      const m = +date.slice(5, 7);
      const d = +date.slice(8);
      const v = y % 400 == 0 || (y % 4 == 0 && y % 100) ? 29 : 28;
      const days = [31, v, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
      return days.slice(0, m - 1).reduce((a, b) => a + b, d);
  };
  
  

All Problems

All Solutions