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已解决
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
int a,b;
cin>>a>>b;
if(b!=1&&b!=2&&b!=3&&b!=4&&b!=5&&b!=6&&b!=7&&b!=8&&b!=9&&b!=10&&b!=1&&b!=12)
{
cout<<"Error!";
}else if(b==1||b==3||b==5||b==7||b==8||b==10||b==12)
{
cout<<"31";
}else if(b==4||b==6||b==9||b==10){
cout<<"30";
}else if(b==2&&a%4==0&&a%100!=0)
{
cout<<"29";
}else {
cout<<"28";
}
return 0;
}

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switch(month)
{
case 2: day=29;
break;
case 4: day=30;
break;
case 6: day=30;
break;
case 9: day=30;
break;
case 11: day=30;
break;
default: day=31;
break;
}
}
else
{
switch(month){
case 2: day=28;
break;
case 4: day=30;
break;
case 6: day=30;
break;
case 9: day=30;
break;
case 11: day=30;
break;
default: day=31;
break;
}
}

