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happyZYM
2023-08-03 09:22:52 +08:00
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#include<cstdio>
#define For(i,a,b) for(int i=a;i<=b;++i)
inline int max(int a,int b) { return a>b?a:b; }
template<typename T> inline void read(T& t)
{
t=0; bool f=false; char ch;
while(ch=getchar(),!((ch>='0'&&ch<='9')||ch=='-'));
if(ch=='-') f=true,ch=getchar();
t=ch-'0';
while(ch=getchar(),ch>='0'&&ch<='9') t=t*10+ch-'0';
if(f) t=-t;
}
template<typename T,typename... Args> inline void read(T& t,Args&... args) { read(t); read(args...); }
const int maxnm=1005;
int n,m,a,b,c,d;
int mp[maxnm][maxnm],s[maxnm][maxnm];
int MWR[maxnm][maxnm],MW[maxnm][maxnm];
int que[maxnm],head,tail;
inline int SubSum(int r,int c,int rl,int cl)
{ return s[r][c]-s[r-rl][c]-s[r][c-cl]+s[r-rl][c-cl]; }
int main()
{
#ifdef local
freopen("pro.in","r",stdin);
#endif
read(n,m,a,b,c,d);
For(i,1,n) For(j,1,m) read(mp[i][j]);
For(i,1,n) For(j,1,m) s[i][j]=mp[i][j]+s[i-1][j]+s[i][j-1]-s[i-1][j-1];
For(i,c+1,n-1)
{
head=tail=0;
For(j,d+1,b-2)
{
while(head<tail&&SubSum(i,j,c,d)<=SubSum(i,que[tail-1],c,d)) tail--;
que[tail++]=j;
}
For(j,b-1,m-1)
{
while(head<tail&&(que[head]-d+1)<=(j+1-b+1)) head++;
while(head<tail&&SubSum(i,j,c,d)<=SubSum(i,que[tail-1],c,d)) tail--;
que[tail++]=j;
MWR[i+1][j+1]=SubSum(i,que[head],c,d);
}
}
For(j,b,m)
{
head=tail=0;
For(i,c+2,a-1)
{
while(head<tail&&MWR[i][j]<=MWR[que[tail-1]][j]) tail--;
que[tail++]=i;
}
For(i,a,n)
{
while(head<tail&&(que[head]-c)<=(i-a+1)) head++;
while(head<tail&&MWR[i][j]<=MWR[que[tail-1]][j]) tail--;
que[tail++]=i;
MW[i][j]=MWR[que[head]][j];
}
}
int res=0;
For(i,a,n) For(j,b,m) res=max(res,SubSum(i,j,a,b)-MW[i][j]);
printf("%d\n",res);
return 0;
}
/*
8 8 5 5 2 2
9 7 6 9 3 5 7 6
6 5 8 2 5 4 4 1
6 1 6 3 3 5 5 3
2 8 2 5 3 6 1 8
6 2 1 4 6 2 9 1
5 0 3 6 4 9 2 9
3 4 4 0 5 9 6 3
4 2 8 8 7 5 8 1
MWR:
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 19 13 13 17
0 0 0 0 16 14 14 17
0 0 0 0 12 12 17 17
0 0 0 0 6 14 20 21
0 0 0 0 11 13 15 26
MW:
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 16 13 13 17
0 0 0 0 12 12 13 17
0 0 0 0 6 12 14 17
0 0 0 0 6 12 15 17
110
*/