Day of the Year
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
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 31th, 2019.
思路一：直接计算
public int dayOfYear(String date) {
String[] split = date.split("-");
int year = Integer.parseInt(split[0]);
int month = Integer.parseInt(split[1]);
int day = Integer.parseInt(split[2]);
int[] days = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
days[1] = 29;
}
int result = 0;
for (int i = 0; i < month - 1; i++) {
result += days[i];
}
return result + day;
}