HDU 5115 Dire Wolf ——(区间DP)

  比赛的时候以为很难,其实就是一个区间DP= =。。思路见:点我

  区间DP一定要记住先枚举区间长度啊= =~!因为区间dp都是由短的区间更新长的区间的,所以先把短的区间更新完。。

  代码如下:

 1 #include <stdio.h>
 2 #include <algorithm>
 3 #include <string.h>
 4 using namespace std;
 5 const int N = 200 + 5;
 6 const int inf = 0x3f3f3f3f;
 7
 8 int n;
 9 int a[N],b[N];
10 int dp[N][N];
11
12 int main()
13 {
14     int T;scanf("%d",&T);
15     for(int kase=1;kase<=T;kase++)
16     {
17         scanf("%d",&n);
18         memset(a,0,sizeof(a));
19         memset(b,0,sizeof(b));
20         for(int i=1;i<=n;i++) scanf("%d",a+i);
21         for(int i=1;i<=n;i++) scanf("%d",b+i);
22
23         memset(dp,inf,sizeof(dp));
24         for(int len=0;len<=n;len++)
25         {
26             for(int i=1;i+len<=n;i++)
27             {
28                 int j = i + len;
29                 for(int k=i;k<=j;k++)
30                 {
31                     dp[i][j] = min(dp[i][j],b[i-1]+b[j+1]+a[k]+(k>i?dp[i][k-1]:0)+(k<j?dp[k+1][j]:0));
32                 }
33             }
34         }
35         printf("Case #%d: %d\n",kase,dp[1][n]);
36     }
37 }
时间: 2024-10-11 05:49:35

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