题解 | #今年的第几天？#

#include <iostream>
#include<algorithm>
#include<cmath>
using namespace std;

bool runnian(int year) {
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) return true;
    else return false;
}
int main() {
    int y, m, d;
    while (cin >> y >> m >> d) {
        int days = 0;
        int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        if (runnian(y)) month[1] = 29;
        for (int i = 0; i < m - 1; i++) 
            days += month[i];
        days = days + d;
        cout << days << endl;
    }
return 0;
}