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BinaryDP.java
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package he;
import java.util.Scanner;
public class BinaryDP {
private static Scanner s;
public static void main(String[] args) {
// TODO Auto-generated method stub
s= new Scanner(System.in);
int n=s.nextInt();
int b[]=new int[n+1];
for(int i=1; i<=n; i++) b[i]= s.nextInt();
int dp[][]= new int[n+1][n+1];
for(int i=0; i<n+1; i++)
for(int j=0; j<n+1; j++)
dp[i][j]=-1;
int[][] co=new int[n+1][2];
int count=0;
for(int i=1; i<=n; i++) {
for(int j=i; j<=n; j++) {
if(i==1) {
dp[i][j]= b[j];
}
else {
dp[i][j]= dp[i-1][j-1]^b[j];
}
count+=dp[i][j];
for(int k=j; k>j-i; k--) {
co[k][dp[i][j]]++;
}
}
}
/*
for(int i=1; i<=n; i++) {
for(int j=i; j<=n; j++) {
System.out.print(dp[i][j]+" ");
}
System.out.println();
}
for(int i=1; i<=n; i++) {
for(int j=0; j<=1; j++) {
System.out.println(co[i][j]);
}
}
*/
int max=0;
for(int i=1; i<=n; i++) {
if(co[i][0]>co[i][1]) {
if(max<(co[i][0]-co[i][1])) {
max=(co[i][0]-co[i][1]);
}
}
}
System.out.println(count+max);
}
}