Timus 1287

简单DP

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
char map[2][1410];
int S[4][2][1410],s[4][2][1410],smax,Smax;
int max(int a,int b)
{
    return a > b ? a : b;
}
int work(int n,int e)
{
    int i;
    for(i=1;i<=n;i++)
    {
        if(map[e][i]=='S')
        {
            if(map[1-e][i]=='S') 
                S[0][e][i]=S[0][1-e][i]+1;    
            else 
                S[0][e][i]=1;
                
            if(map[e][i-1]=='S')
                S[1][e][i]=S[1][e][i-1]+1;    
            else 
                S[1][e][i]=1;
                
            if(map[1-e][i-1]=='S') 
                S[2][e][i]=S[2][1-e][i-1]+1;    
            else 
                S[2][e][i]=1;
                
            if(map[1-e][i+1]=='S') 
                S[3][e][i]=S[3][1-e][i+1]+1;    
            else
                S[3][e][i]=1;    
        }
        if(map[e][i]=='s')
        {
            if(map[1-e][i]=='s') 
                s[0][e][i]=s[0][1-e][i]+1;    
            else 
                s[0][e][i]=1;
                
            if(map[e][i-1]=='s')
                s[1][e][i]=s[1][e][i-1]+1;    
            else 
                s[1][e][i]=1;
                
            if(map[1-e][i-1]=='s') 
                s[2][e][i]=s[2][1-e][i-1]+1;    
            else 
                s[2][e][i]=1;
                
            if(map[1-e][i+1]=='s') 
                s[3][e][i]=s[3][1-e][i+1]+1;    
            else
                s[3][e][i]=1;    
        }
        Smax=max(Smax,max(max(S[0][e][i],S[1][e][i]),max(S[2][e][i],S[3][e][i])));
        smax=max(smax,max(max(s[0][e][i],s[1][e][i]),max(s[2][e][i],s[3][e][i])));
    }
        return 0;
}
int main()
{
    int i,n,e;
    while(scanf("%d",&n)!=EOF)
    {
        memset(S,0,sizeof(S));
        memset(s,0,sizeof(s));
        e=smax=Smax=0;
        for(i=0;i<n;i++)
        {
            e=1-e;
            scanf("%s",map[e]+1);
                        work(n,e);
        }
        if(Smax > smax)
        {
            printf("S\n%d\n",Smax);
        }
        else if(smax > Smax)
        {
            printf("s\n%d\n",smax);
        }
        else
        {
            printf("?\n%d\n",smax);
        }
        
    }
    return 0;

}