肝帝的方法

#include<iostream>
using namespace std;
int main(){
int y,m;
cin>>y>>m;
if(y % 4 == 0 && y % 100 != 0 || y % 400 == 0){
if(m1||m3||m5||m7||m8||m10||m12){
cout <<"31";
}else if(m2){
cout <<"29";
}else{
cout<<"30";
}
}else{
if(m1||m3||m5||m7||m8||m10||m12){
cout <<"31";
}else if(m2){
cout <<"28";
}else{
cout<<"30";
}
}
return 0;
}