题解 | 今年的第几天？

#include <iostream>
using namespace std;

int main() {
    int y, m, d;
    int day[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    while (cin >> y >> m >> d) {
        int  count = 0;
        for (int i = 0; i < m; i++) {
            count += day[i];
        }
        count += d;    //加上本月的day
        if (m > 2 && ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0)) {
            count++;
        }     //如果月份大于2，则加上2月闰月多的那一天
        cout << count << endl;
    }
}