http://poj.org/problem?id=3186 //* @author: 82638882@163.com import java.io.*; public class Main { public static void main(String[] args) throws IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); String s=in.readLine(); int a=Integer.parseInt(s); int[] arr=new int[a]; int[][] ds=new int[a][a]; for(int i=0;i< a;i++) { s=in.readLine(); arr[i]=Integer.parseInt(s); } System.out.println(f(arr,0,a-1,ds)); } public static int f(int[] arr,int l,int r,int[][] ds) { if(ds[l][r]!=0) return ds[l][r]; int n=arr.length; if(l==r) return ds[l][l]=n*arr[l]; int w=f(arr,l+1,r,ds)+(n-r+l)*arr[l]; int o=f(arr,l,r-1,ds)+(n-r+l)*arr[r]; ds[l][r]=Math.max(w, o); return ds[l][r]; } }
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