无脑写法

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;cin>>n;
    cout<<"MON TUE WED THU FRI SAT SUN"<<endl;
    if(n==1||n==10)
    {
        cout<<"          1   2   3   4   5"<<endl<<" "<<" 6   7   8   9  10  11  12";
        cout<<endl<<" 13  14  15  16  17  18  19"<<endl<<" 20  21  22  23  24  25  26";
        cout<<endl<<" 27  28  29  30  31";
    }
    if(n==2)
    {
        cout<<"                      1   2"<<endl;
        cout<<"  3   4   5   6   7   8   9"<<endl<<" 10  11  12  13  14  15  16"<<endl<<" 17  18  19  20  21  22  23"<<endl;
        cout<<" 24  25  26  27  28";
    }
    if(n==3)
    {
        cout<<"                      1   2"<<endl<<"  3   4   5   6   7   8   9"<<endl;
        cout<<" 10  11  12  13  14  15  16"<<endl<<" 17  18  19  20  21  22  23"<<endl;
        cout<<" 24  25  26  27  28  29  30"<<endl<<" 31";
    }
    if(n==4)
    {
        cout<<"      1   2   3   4   5   6"<<endl<<"  7   8   9  10  11  12  13"<<endl;
        cout<<" 14  15  16  17  18  19  20"<<endl;
        cout<<" 21  22  23  24  25  26  27"<<endl<<" 28  29  30";
    }
    if(n==5)
    {
        cout<<"              1   2   3   4"<<endl<<"  5   6   7   8   9  10  11"<<endl;
        cout<<" 12  13  14  15  16  17  18"<<endl<<" 19  20  21  22  23  24  25"<<endl<<" 26  27  28  29  30  31";
    }
    if(n==6)
    {
        cout<<"                          1"<<endl;
        cout<<"  2   3   4   5   6   7   8"<<endl<<"  9  10  11  12  13  14  15"<<endl<<" 16  17  18  19  20  21  22"<<endl<<" 23  24  25  26  27  28  29"<<endl<<" 30";
    }
    if(n==7)
    {
        cout<<"      1   2   3   4   5   6"<<endl<<"  7   8   9  10  11  12  13"<<endl;
        cout<<" 14  15  16  17  18  19  20"<<endl;
        cout<<" 21  22  23  24  25  26  27"<<endl<<" 28  29  30  31";
    }
    if(n==8)
    {
        cout<<"                  1   2   3"<<endl<<"  4   5   6   7   8   9  10"<<endl<<" 11  12  13  14  15  16  17"<<endl<<" 18  19  20  21  22  23  24"<<endl<<" 25  26  27  28  29  30  31";
    }
    if(n==9)
    {
        cout<<"  1   2   3   4   5   6   7"<<endl<<"  8   9  10  11  12  13  14"<<endl<<" 15  16  17  18  19  20  21"<<endl<<" 22  23  24  25  26  27  28"<<endl<<" 29  30";
    }
    if(n==11)
    {
        cout<<"                      1   2"<<endl<<"  3   4   5   6   7   8   9"<<endl;
        cout<<" 10  11  12  13  14  15  16"<<endl<<" 17  18  19  20  21  22  23"<<endl;
        cout<<" 24  25  26  27  28  29  30";
    }
    if(n==12)
    {
        cout<<"  1   2   3   4   5   6   7"<<endl<<"  8   9  10  11  12  13  14"<<endl<<" 15  16  17  18  19  20  21"<<endl<<" 22  23  24  25  26  27  28"<<endl<<" 29  30  31";
    }
    return 0;
}