题解 | #计算日期到天数转换#

#include <iostream>
using namespace std;

int daytab[2][13] = {
    {
        0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    },
    {
        0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    }
};

bool IsLeapYear(int year) {  //判断是否为闰年
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}

int main() {
    int year, month, day;
    while (cin >> year >> month >> day) {
        int number = 0; //记录天数
        int row = IsLeapYear(year);
        for (int i = 0; i < month; i++) {
            number += daytab[row][i];
        }
        number += day;
        cout << number;
    }
    return 0;
}