题解 | #获得月份天数#

#include <iostream>
using namespace std;

int main()
{
    int year,month;
    while(cin>>year>>month)
    {
        switch(month)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:cout<<31<<endl;break;
            case 4:
            case 6:
            case 9:
            case 11:cout<<30<<endl;break;
            case 2://二月分离出来结合是否闰年判断
            {
        if(year%400==0||year%100&&year%4==0)//如果为闰年...
                cout<<29<<endl;
                else
                 cout<<28<<endl;
                 break;
            }             
        }
    }
    return 0;
}