nefu1130Attack monsters【平行四邊形優化石子合併】

//題中明確說了給定的不一定是有序的！！   
<span style="background-color: rgb(255, 255, 255);"></span> #include <iostream>
    #include <string.h>
    #include <stdio.h>
    #include<algorithm>
    using namespace std;
    const int INF = 1 << 30;
    const int N = 1005;

    int dp[N][N];
    int p[N][N];
    int sum[N];
    int n;

    int getMinval()
    {
        for(int i=1; i<=n; i++)
        {
            dp[i][i] = 0;
            p[i][i] = i;
        }
        for(int len=1; len<n; len++)
        {
            for(int i=1; i+len<=n; i++)
            {
                int end = i+len;
                int tmp = INF;
                int k = 0;
                for(int j=p[i][end-1]; j<=p[i+1][end]; j++)
                {
                    if(dp[i][j] + dp[j+1][end] + sum[end] - sum[i-1] < tmp)
                    {
                        tmp = dp[i][j] + dp[j+1][end] + sum[end] - sum[i-1];
                        k = j;
                    }
                }
                dp[i][end] = tmp;
                p[i][end] = k;
            }
        }
        return dp[1][n];
    }

    int main()
    {
       // freopen("cin.txt","r",stdin);
        int m;
        while(scanf("%d%d",&n,&m)!=EOF)
        {
            if(n==0&&m==0) break;
            sum[0] = 0;
            for(int i=1; i<=n; i++)
            {
                int val;
                scanf("%d",&sum[i]);
                 //= sum[i-1] + val;
            }
            sum[++n]=m;
            sort(sum+1,sum+1+n);
            printf("%d\n",getMinval());
        }
        return 0;
    }