OJ-Problems-Source/HDOJ/2870_autoAC.cpp

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