思路

强行模拟求

#include 
#include 
using namespace std;
int a[30][30],c[30][30],f[30][30];
char ch[4];
int main()
{
    int n;
    scanf("%d",&n);
    for (int i=1;i<=n;i++)
    {
        scanf("%s",&ch);
        for (int j=1;j<=n;j++)
        {
            if (ch[j-1]=='1') a[i][j]=1;
        }
    }
    for (int k=1;k<=4;k++)
    {
        for (int i=1;i<=n;i++)
            for (int j=1;j<=n;j++)
                c[i][j]=0;
        for (int i=1;i<=n;i++)
            for (int j=1;j<=n;j++)
            {
                if (a[i][j]==1)
                {
                    f[i][j]=a[i][j];
                }
                c[j][n-i+1]=a[i][j];
            }
        for (int i=1;i<=n;i++)
            for (int j=1;j<=n;j++)
                a[i][j]=c[i][j];
        int ans=0;
        for (int i=1;i<=n;i++)
            for (int j=1;j<=n;j++)
            {
                if (f[i][j]==1) ans++;
            }   
        printf("%d\n",ans);

    }
}