hdu 4328

#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;

int t,n,m;
char s[1002][1002];
int rr[1002][1002],b[1002][1002],rb[1002][1002];//rr[i][j],以第i行,第j列为顶边的红色矩形的高,(i,j从1开始)
int r[1002],l[1002];
int main()
{
    int ca=1;
    scanf("%d",&t);
    while(t--)
    {
        memset(rr,0,sizeof(rr));
        memset(b,0,sizeof(b));
        memset(br,0,sizeof(br));
        memset(rb,0,sizeof(rb));
        memset(s,0,sizeof(s));
        scanf("%d%d",&n,&m);
        for(int i=0;i<n;i++)
            scanf("%s",s[i]);
        for(int i=1;i<=n;i++)
        {
            for(int j=1;j<=m;j++)
            {
                if(s[i-1][j-1]=='R')
                    rr[i][j]=rr[i][j-1]+1;
                else
                    rr[i][j]=0;

                if(s[i-1][j-1]=='B')
                    b[i][j]=b[i][j-1]+1;
                else
                    b[i][j]=0;

                if(j==1) rb[i][j]=1;
                else if(j>1)
                {
                    if(s[i-1][j-1]!=s[i-1][j-2]) rb[i][j]=rb[i][j-1]+1;
                    else rb[i][j]=1;
                }
            }
        }
        int ans=0;

        for(int j=1;j<=m;j++)
        {
            for(int i=1;i<=n;i++)
            {
                l[i]=r[i]=i;
            }
            for(int i=1;i<=n;i++)
            {
                while(b[i][j]<=b[l[i]-1][j]&&l[i]>=1&&b[i][j]>0) l[i]=l[l[i]-1];
            }
            for(int i=n;i>=1;i--)
            {
                while(b[i][j]<=b[r[i]+1][j]&&r[i]<=n&&b[i][j]>0) r[i]=r[r[i]+1];
            }
            for(int i=1;i<=n;i++)
                ans=max(ans,b[i][j]*2+(r[i]-l[i]+1)*2);
        }

        for(int j=1;j<=m;j++)
        {
            for(int i=1;i<=n;i++)
            {
                l[i]=r[i]=i;
            }
            for(int i=1;i<=n;i++)
            {
                while(rr[i][j]<=rr[l[i]-1][j]&&l[i]>=1&&rr[i][j]>0) l[i]=l[l[i]-1];
            }
            for(int i=n;i>=1;i--)
            {
                while(rr[i][j]<=rr[r[i]+1][j]&&r[i]<=n&&rr[i][j]>0) r[i]=r[r[i]+1];
            }
            for(int i=1;i<=n;i++)
                ans=max(ans,rr[i][j]*2+(r[i]-l[i]+1)*2);
        }
        for(int j=1;j<=m;j++)
        {
            for(int i=1;i<=n;i++)
            {
                l[i]=r[i]=i;
            }
            for(int i=1;i<=n;i++)
            {
                while(rb[i][j]<=rb[l[i]-1][j]&&l[i]>=1&&s[l[i]-1-1][j-1]!=s[l[i]-1][j-1]) l[i]=l[l[i]-1];
            }
            for(int i=n;i>=1;i--)
            {
                while(rb[i][j]<=rb[r[i]+1][j]&&r[i]<=n&&s[r[i]+1-1][j-1]!=s[r[i]-1][j-1]) r[i]=r[r[i]+1];
            }
            for(int i=1;i<=n;i++)
                ans=max(ans,rb[i][j]*2+(r[i]-l[i]+1)*2);
        }
        printf("Case #%d: %d\n",ca++,ans);
    }
}