版权声明:本文为博主原创文章,未经博主允许必须转载。 https://blog.csdn.net/qq_35950004/article/details/82152779
利用极大化思想。
UVA 1330
AC Code:
#include<bits/stdc++.h>
#define maxn 1005
using namespace std;
int n,m,u[maxn][maxn],l[maxn][maxn],r[maxn][maxn];
bool is[maxn][maxn];
char s[3];
int main()
{
int T;
for(scanf("%d",&T);T--;)
{
scanf("%d%d",&n,&m);
memset(u,0,sizeof u);
memset(l,0,sizeof l);
memset(r,0,sizeof r);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
scanf("%s",s);
if(is[i][j] = (s[0]=='R'))
u[i][j] = 0;
else
if(i) u[i][j] = 1 + u[i-1][j];
else u[i][j] = 1;
l[i][j] = j+1;
r[i][j] = j-1;
}
for(int i=1;i<=n;i++) l[i][0] = 1 , r[i][m+1] = m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(!is[i][j]) l[i][j] = l[i][j-1];
for(int i=1;i<=n;i++)
for(int j=m;j>=1;j--)
if(!is[i][j]) r[i][j] = r[i][j+1];
int ans=0;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(i>1 && !is[i-1][j] && !is[i][j]) l[i][j] = max(l[i][j] , l[i-1][j]) , r[i][j] = min(r[i][j] , r[i-1][j]);
if(!is[i][j])ans = max(ans , (r[i][j] - l[i][j] + 1) * u[i][j]);
}
printf("%d\n",ans*3);
}
}