從西元年較小的開始算

寫一個判斷閏年的function

switch 蠻好用的

code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class main {
    public static void main(String[] args) throws IOException {
        /*AC (0.3s, 7.6MB)*/
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String first;
        while ((first = br.readLine()) != null) {
            String second = br.readLine();
            String[] f = first.split(" ");
            String[] s = second.split(" ");
            int y1 = Integer.parseInt(f[0]);
            int m1 = Integer.parseInt(f[1]);
            int d1 = Integer.parseInt(f[2]);
            int y2 = Integer.parseInt(s[0]);
            int m2 = Integer.parseInt(s[1]);
            int d2 = Integer.parseInt(s[2]);
            int start = Math.min(y1, y2);
            int during = Math.abs(fuckday(y1, m1, d1, start) - fuckday(y2, m2, d2, start));
            System.out.println(during);
        }
    }
    static int fuckday(int y, int m, int d, int start) {
        int sum = 0;
        for (int i = start; i < y; i++) {
            if (leap(i)) {
                sum += 366;
            } else {
                sum += 365;
            }
        }
        for (int i = 1; i < m; i++) {
            switch (i) {
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    sum += 31;
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    sum += 30;
                    break;
                default:
                    if (leap(y))
                        sum += 29;
                    else
                        sum += 28;
            }
        }
        sum += d;
        return sum;
    }

    static boolean leap(int y) {
        return ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) ? true : false;
    }
}