题解 | #计算日期到天数转换#

#include <iostream>
#include <vector>

using namespace std;

int main() {
    vector<int> vec = {31,28,31,30,31,30,31,31,30,31,30,31};//平年2月份28天。闰年29天
    int tmp = 29;
    int num, days = 0;
    while (cin >> num){
        if (num % 4 == 0 ){
            if (num % 100 == 0){//整百年需要被400除尽才是闰年
                if (num % 400 == 0){
                    swap(vec[1], tmp); 
                }
            } //非整百年
            else{
                swap(vec[1], tmp); 
            }
        } 
           
        while (cin >> num){
            for (int i = 0; i < num - 1; i++){
                days += vec[i];
            }

            while (cin >> num){
                days += num;
            }
        }
    }

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