[gcj] I get WA when running this java code

[FonsoGV 5]

Hi everyone I'm really new here and I gave a try for the first problem of 
Kickstart 2020.
I get WA, but when I give my tests set, it gives good answers, here is my 
code:

public class Ej1 
{

    
    public static void main(String[] args) 
    {
        int t,n,b,value,n_casas;
        Scanner S= new Scanner(System.in);
        
        t=S.nextInt();
        
        int cases[]= new int[t];
        for(int i=0;i<t;i++)
        {
            n=S.nextInt();
            b=S.nextInt();
            
            int a[] = new int [n];
            
            for(int j=0;j<n;j++)
            {
                value=S.nextInt();
                a[j]=value;
            }
            
            
             n_casas=contadorCasas(a,b);  
             
             cases[i]=n_casas;
             
        }
        
        for(int i =0;i<t;i++)
            System.out.println("Case#"+(i+1)+":"+cases[i]);
        
    }
    
    
    static int contadorCasas(int v[], int b)
    {
        int aux=v[0];
        int counter=0;
        minimoVec(v);
        
        
        if(aux<b)
        {
            counter++;
            for(int i =1;i<v.length;i++)
            {
                if(aux+v[i]<b)
                {
                    aux+=v[i];
                    counter++;
                }
            }
        }
        
        
        return counter;
    }
    
    static void minimoVec(int vec[])
    {
        int min=vec[0];
        int aux;
        
        for (int x = 0; x < vec.length; x++) {
            for (int i = 0; i < vec.length-x-1; i++) {
                if(vec[i] < vec[i+1]){
                    int tmp = vec[i+1];
                    vec[i+1] = vec[i];
                    vec[i] = tmp;
            }   
        }
    }
        
        
    }
    
} 

I'm new so I'm really receptive for ideas.

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