100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <cstring>
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#include <string>
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#include <cstdio>
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#include <cmath>
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#include <queue>
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#include <map>
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#include <set>
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#define eps 1e-5
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#define MAXN 105
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#define MAXM 11111
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#define INF 1000000000
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#define lch(x) x<<1
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#define rch(x) x<<1|1
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#define lson l,m,rt<<1
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#define rson m+1,r,rt<<1|1
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using namespace std;
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int n, m, x, t;
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int in()
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{
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int flag = 1;
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char ch;
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int a = 0;
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while((ch = getchar()) == ' ' || ch == '\n');
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if(ch == '-') flag = -1;
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else
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a += ch - '0';
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while((ch = getchar()) != ' ' && ch != '\n')
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{
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a *= 10;
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a += ch - '0';
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}
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return flag * a;
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}
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int dp[MAXN][MAXM];
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int sum[MAXN][MAXM];
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int lmx[4 * MAXM];
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int rmx[4 * MAXM];
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int a[MAXN][MAXM];
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int q[MAXM];
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int main()
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{
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while(scanf("%d%d%d%d", &n, &m, &x, &t) != EOF)
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{
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for(int i = 1; i <= n + 2; i++)
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for(int j = 1; j <= m; j++)
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sum[i][j] = 0, dp[i][j] = -INF, a[i][j] = 0;
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for(int i = 1; i <= n; i++)
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for(int j = 1; j <= m; j++)
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{
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a[i][j] = in();
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sum[i][j] = sum[i][j - 1] + a[i][j];
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}
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int tmp = 0;
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for(int i = x; i <= x + t; i++)
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{
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tmp += a[1][i];
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dp[1][i] = tmp;
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dp[2][i] = dp[1][i] + a[2][i];
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}
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tmp = 0;
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for(int i = x; i >= x - t; i--)
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{
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tmp += a[1][i];
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dp[1][i] = tmp;
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dp[2][i] = dp[1][i] + a[2][i];
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}
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for(int i = 3; i <= n + 1; i++)
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{
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for(int j = 1; j <= m; j++)
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{
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lmx[j] = dp[i - 1][j] - sum[i - 1][j];
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rmx[j] = dp[i - 1][j] + sum[i - 1][j - 1];
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}
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int head = 1, rear = 0;
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for(int j = 1; j <= m; j++)
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{
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while(head <= rear && lmx[q[rear]] <= lmx[j]) rear--;
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q[++rear] = j;
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while(head <= rear && q[head] < j - t) head++;
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dp[i][j] = max(lmx[q[head]] + sum[i - 1][j] + a[i][j], dp[i][j]);
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}
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head = 1, rear = 0;
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for(int j = m; j >= 1; j--)
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{
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while(head <= rear && rmx[q[rear]] <= rmx[j]) rear--;
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q[++rear] = j;
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while(head <= rear && q[head] > j + t) head++;
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dp[i][j] = max(rmx[q[head]] - sum[i - 1][j - 1] + a[i][j], dp[i][j]);
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}
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}
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int ans = -INF;
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for(int i = 1; i <= m; i++)
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if(dp[n + 1][i] > ans) ans = dp[n + 1][i];
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printf("%d\n", ans);
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}
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return 0;
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}
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