90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<vector>
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#include<algorithm>
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#include<cstring>
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#include<queue>
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#include<set>
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#include<math.h>
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#include<string>
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using namespace std;
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typedef long long ll;
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#define PI acos(-1.0)
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#define INF 2*1e9
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#define eps 1e-6
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using namespace std;
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#define MAXN 100010
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int n,m;
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int a[1010][1010];
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int l[1010],r[1010];
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char map[1010][1010],map1[1010][1010];
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bool can[50][50];
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char ok[5][7]={"wabww","xbcxx", "yacyy","zabcz"};
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char tar[]= "abc";
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int solve();
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int main()
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{
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memset(can,0,sizeof(can));
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memset(map1,0,sizeof(map1));
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int i,j ,k ;
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for(i=0;i<111;i++) map1[i][0]='1';
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for(i=0;i<4;i++)
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{
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for(j=1;j<5;j++)
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{
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can[ok[i][0]-'a'][ok[i][j]-'a'] = 1;
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}
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}
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while(scanf("%d%d",&n,&m)!=EOF)
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{
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for(i=1;i<=n;scanf("%s",map[i++]+1) );
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int ans =-1;
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for(k=0;k<strlen(tar);k++)
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{
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memset(a,0,sizeof(a));
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for(i=1;i<=n;i++)
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for(j=1;j<=m;j++)
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{
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map1[i][j] = map[i][j];
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if(can[ map[i][j]-'a' ][tar[k]-'a'] )
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map1[i][j] = tar[k];
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if(map1[i][j]==map1[i-1][j])
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a[i][j] =1+a[i-1][j];
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else
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a[i][j] = 1;
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}
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int qqq=solve();
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if( qqq>ans ) ans =qqq;
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}
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printf("%d\n",ans);
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}
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}
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int solve()
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{
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int i,j;
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int ans = -1 ,t;
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for(i=1;i<=n;i++)
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{
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a[i][0]= a[i][m+1] =-1;
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for(j=1;j<=m;j++)
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r[j]=l[j] =j;
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for(j=1;j<=m;j++)
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{
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while( map1[i][j] == map1[i][l[j]-1] && a[i][j]<= a[i][l[j]-1] )
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l[j]= l[l[j]-1 ];
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}
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for(j=m;j>=1;j--)
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{
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while( map1[i][j]==map1[i][r[j]+1] && a[i][j]<= a[i][ r[j]+1] )
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r[j] =r[r[j]+1] ;
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}
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for(j=1;j<=m;j++)
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{
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t= a[i][j]*( r[j]-l[j] +1 );
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if(t> ans)
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ans= t;
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}
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}
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return ans;
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}
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