hdu 1505 1506的加强版

跟1506思路一致

1506

AC代码:

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <iostream>
#define MAX 1007

using namespace std;

int t,n,m;
bool a[MAX][MAX];
int h[MAX];
int lef[MAX],rig[MAX];
int ans;

int main ( )
{
    scanf ( "%d" , &t );
    while ( t-- )
    {
        char c[10];
        scanf ( "%d%d" , &n , &m );
        for ( int i = 1 ; i <= n ; i++ )
            for ( int j = 1 ; j <= m ; j++ )
            {
                scanf ( "%s" , c );
                if ( c[0] == 'R' ) a[i][j] = 0;
                else a[i][j] = 1;
            }
       /* for ( int i = 1 ; i <= n ; i++ )
        {
            for ( int j = 1 ; j <= n ; j++ )
                cout << a[i][j] << " ";
            cout << endl;
        }*/
        ans = 0;
        memset ( h , 0  , sizeof ( h ) );
        for ( int i = 1 ; i <= n ; i++ )
        {
            for ( int j = 1 ; j <= m ; j++ )
            {
                lef[j] = rig[j] = j;
                if ( a[i][j] ) h[j]++;
                else h[j] = 0;
            }
            for ( int j = 2 ; j <= m ; j++ )
                while ( lef[j] > 1 && h[lef[j]-1]>=h[j] )
                    lef[j] = lef[lef[j]-1];
            for ( int j = m-1 ; j >= 1 ; j-- )
                while ( rig[j] < m && h[rig[j]+1]>=h[j] )
                    rig[j] = rig[rig[j]+1];
            for ( int j = 1 ; j <= m ; j++ )
                ans = max ( ans , h[j]*(rig[j]-lef[j]+1) );    
        }
       printf ( "%d\n" , ans*3 ); 
    }
}