http://poj.org/problem?id=2228 /* @author: */ import java.util.Scanner; import java.util.Arrays; public class Main{ static int maxs=Integer.MAX_VALUE/3; int f[][][]=new int[2][3831][2]; int g[][][]=new int[2][3831][2]; int a[]=new int[3831]; int n,m; int maxv(int x,int y){ return x>y?x:y; } void dp(){ int pre=0,cur=1; for(int i=0;i<=m;i++) f[1][i][0]=f[1][i][1]=g[1][i][0]=g[1][i][1]=-maxs; f[1][0][0]=f[1][1][1]=0; g[1][0][0]=0; g[1][1][1]=a[1]; for(int i=2;i<=n;i++){ pre=cur; cur=(cur+1)%2; f[cur][0][1]=-maxs; g[cur][0][1]=-maxs; for(int j=1;j<=m;j++){ f[cur][j][0]=maxv(f[pre][j][0],f[pre][j][1]); f[cur][j][1]=maxv(f[pre][j-1][0],f[pre][j-1][1]+a[i]); g[cur][j][0]=maxv(g[pre][j][0],g[pre][j][1]); g[cur][j][1]=maxv(g[pre][j-1][0],g[pre][j-1][1]+a[i]); } } int result=maxv(maxv(f[cur][m][0],f[cur][m][1]),g[cur][m][1]); System.out.printf("%dn",result); } void init(){ Scanner sc=new Scanner(System.in); n=sc.nextInt(); m=sc.nextInt(); for(int i=1;i<=n;i++) a[i]=sc.nextInt(); } public static void main(String args[]){ Main m=new Main(); m.init(); m.dp(); } }
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