HDU 1024 Max Sum Plus Plus

最大m段子段和，滚动数组

 1 #include <algorithm>
 2 #include <iostream>
 3 #include <cstring>
 4 #include <cstdio>
 5 
 6 using namespace std;
 7 
 8 const int N = 1010000;
 9 const int INF = 2147483640;
10 int n, m, a[N], dp[N], bes[N];
11 
12 int main()
13 {
14     while (~scanf("%d%d", &m, &n))
15     {
16         int ans = -INF;
17         for (int i = 1; i <= n; ++i) 
18             scanf("%d", &a[i]);
19         for (int i = 1; i <= n; ++i)
20             for (int j = 1; j <= m; ++j)
21                 dp[j] = -INF, bes[j] = -INF;
22         for (int i = 1; i <= n; ++i)
23         {
24             for (int j = 1; j <= m && j <= i; ++j)
25                 dp[j] = max(dp[j], bes[j - 1]) + a[i];
26             for (int j = 1; j <= m && j <= i; ++j)
27                 bes[j] = max(bes[j], dp[j]);
28             ans = max(ans, dp[m]);
29         }
30         printf("%d\n", ans);
31     }
32     return 0;
33 }

 

posted @ 2018-12-14 09:53  Christopher_Yan  阅读(132)  评论(0)  编辑  收藏  举报