delete pics to save space

p.HDOJ2870.cpp

@@ -0,0 +1,67 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int maxn=1005;
+/*
+a 1
+b 2
+c 3
+w 4
+x 5
+y 6
+z 7
+ */
+int n,m,a[maxn][maxn],b[maxn][maxn],up[maxn][maxn],id[128],ch[8][8],res,stk[maxn],w[maxn],p;
+char s[maxn];
+int solve(int co)
+{
+	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) b[i][j]=ch[a[i][j]][co];
+	for(int j=1;j<=m;j++) for(int i=1;i<=n;i++) up[i][j]=b[i][j]?up[i-1][j]+1:0;
+	int res=0;
+	for(int i=1;i<=n;i++)
+	{
+		res=max(res,up[i][1]);
+		p=1; stk[1]=up[i][1]; w[1]=1;
+		for(int j=2;j<=m+1;j++)
+		{
+			if(up[i][j]>stk[p]) { stk[++p]=up[i][j]; w[p]=1; }
+			else
+			{
+				int width=0;
+				while(stk[p]>up[i][j])
+				{
+					width+=w[p];
+					res=max(res,width*stk[p]);
+					p--;
+				}
+				stk[++p]=up[i][j]; w[p]=width+1;
+			}
+		}
+	}
+	return res;
+}
+int main()
+{
+	#ifdef local
+	freopen("pro.in","r",stdin);
+	#endif
+	id['a']=1; id['b']=2; id['c']=3; id['w']=4; id['x']=5; id['y']=6; id['z']=7;
+	ch[1][1]=ch[2][2]=ch[3][3]=1;
+	ch[4][1]=ch[4][2]=1;
+	ch[5][2]=ch[5][3]=1;
+	ch[6][1]=ch[6][3]=1;
+	ch[7][1]=ch[7][2]=ch[7][3]=1;
+	while(scanf("%d%d",&n,&m)==2)
+	{
+		memset(a,0,sizeof(a)); memset(b,0,sizeof(b)); memset(up,0,sizeof(up)); res=0;
+		for(int i=1;i<=n;i++)
+		{
+			scanf("%s",s+1);
+			for(int j=1;j<=m;j++) a[i][j]=id[s[j]];
+		}
+		for(int co=1;co<=7;co++) res=max(res,solve(co));
+		printf("%d\n",res);
+	}
+	return 0;
+}