python/TangDou/LianXiTi50/14+.cpp

#include <iostream>
//题目： 2019.4.18至2021.4.9共多少天
using namespace std;
int months_1[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int months_2[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool LeapYear(int year) {
    return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
}

int main() {
    int days = 0;

    //2019,2020
    if (LeapYear(2019))days += 366; else days += 365;
    if (LeapYear(2020))days += 366; else days += 365;

    //2021
    if (LeapYear(2021))
        for (int i = 1; i <= 3; i++) days += months_2[i];
    else
        for (int i = 1; i <= 3; i++) days += months_1[i];
    days += 9;

    //2018
    int d2 = 0;
    if (LeapYear(2018))
        for (int i = 1; i <= 3; i++) d2 += months_2[i];
    else
        for (int i = 1; i <= 3; i++) d2 += months_1[i];
    d2 += 17;

    if (LeapYear(2018)) days += 366 - d2;
    else days += 365 - d2;

    cout << days << endl;
    return 0;
}