#include <stdio.h>
#include <stdlib.h>

main()
{
    int i,j,k,t;
    int sum;
    int max;
    int mark;
    int a[22];
    int* x;
    x=(int*)malloc(1048578*sizeof(int));
    scanf("%d",&a[0]);
    for(i=1,sum=0;scanf("%d",&t)!=EOF;i++)
    {
        for(j=1;j<=i-1 && t>a[j];j++);
        for(k=i-1;k>=j;k--){a[k+1]=a[k];}
        a[j]=t;
        sum+=t;
    }
    x[0]=1;x[1]=0;
    for(i=1;i<=a[0];i++)
    {
        for(j=1,mark=0,max=0;j<=x[0];j++)
        {
            x[j+x[0]]=x[j]+a[i];
            if(x[j]+a[i]<=sum/2)
                max=max>x[j]+a[i]?max:x[j]+a[i];
        }
        x[0]*=2;
    }
    printf("%d",sum-2*max);
}


I test it with a large data but can't find error...