XDU 1001 又是苹果(状态压缩)

#include<cstdio>
#include<cstring>
const int maxn=1e6+5;
using namespace std;
int r[maxn],c[maxn];
char pic[maxn];
void Swap(int &x,int &y)
{
    int temp=x;
    x=y;
    y=temp;
}
int main()
{
    int n,m,op,x,y,T,t=1;
    while(scanf("%d%d",&n,&m)!=EOF){
        for(int i=0;i<n;i++){
            scanf("%s",pic+m*i);
            //for(int j=0;j<m;j++)
            //    printf("%c
",*(pic+m*i+j));
            r[i]=i;
        }
        for(int j=0;j<m;j++)
            c[j]=j;
        scanf("%d",&T);
        printf("Case #%d:
",t++);
        while(T--){
            scanf("%d%d%d",&op,&x,&y);
            if(op==1){
                int pos=r[x-1]*m+c[y-1];
                if(pic[pos]=='T')
                    printf("Tree
");
                else if(pic[pos]=='i')
                    printf("Phone
");
                else
                    printf("Empty
");
            }
            else if(op==2)
                Swap(r[x-1],r[y-1]);
            else
                Swap(c[x-1],c[y-1]); 
        }
    }
}