题解

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int y,m,list[12]{31,28,31,30,31,30,31,31,30,31,30,31};
    cin >> y >> m;
    if (y%4==0 && y%100!=0)
        list[1]=29;
    else if (y%400==0)
        list[1]=29;
    cout << list[m-1];
}