用数组轻松解题！点赞+关注我！哟！😀

#include<iostream>
using namespace std;
int main(){
    int day[13]{29,31,28,31,30,31,30,31,31,30,31,30,31};
    int y,m;
    cin>>y>>m;
    if(y%4==0&&y%100!=0||y%400==0){
        m=0;
    }
    cout<<day[m];
    return 0;
}