没什么说的，放出我的两种80分代码： code one(#3WA):```

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int ryear[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};
    int pyear[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int y,m;
    cin>>y>>m;
    if(y%4!=0&&y%400!=0)
    cout<<pyear[m];
    else
    cout<<ryear[m];
    return 0;
}

code two(#4WA):```

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int ryear[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};
    int pyear[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int y,m;
    cin>>y>>m;
    if((y%100!=0)&&(y%4!=0)||(y%400!=0))
    cout<<pyear[m];
    else
    cout<<ryear[m];
    return 0;
}

在线等，挺急的