[gcj] getting Run time Error

[Joshi Jaykishan]

I turn in my java code in Code Jam but I get Run Time Error.

here my code 

import java.util.*;
class Main
{
public static void main(String[] args) {
int t,i=0,k=0,count=0,v=0,c=0,n=0;
String r="\0";
int []st=new int[10],e=new int[10];
Scanner s = new Scanner(System.in);
t=s.nextInt();
for(i=0;i<t;i++)
{
    
    n=s.nextInt();
    for(k=0;k<n;k++)
    {
        st[k]=s.nextInt();
        e[k]=s.nextInt();
    }
    
    for(k=0;k<n;k++)
    {
        
            if(k==0)
            {
                r='c'+r;
            }
            else if(k==1){
                r=r+'j';
            }
            else if(k>1)
            {
                if(st[k]==e[k-1])
                {
                    
                    if(r.charAt(r.length() - 1)  == 'j')
                    {
                        r=r+'j';
                    }
                    else if(r.charAt(r.length() - 1)  == 'c')
                    {
                        r=r+'c';
                    }
                }
                else if(st[k]>e[v] || st[k]>e[k-1])
                {
                    r=r+'c';
                }
                else if(st[v]<st[k] && st[k]<e[v])
                {
                    c++;
                    break;
                }else if(st[k]<st[v])
                {
                    if(r.charAt(r.length() - 1)  == 'j')
                    {
                        r=r+'c';
                    }
                    else if(r.charAt(r.length() - 1)  == 'c')
                    {
                        r=r+'j';
                    }
                    
                }
                
                
            }
            
        
    }
    if(c==0)
    {
        i++;
    System.out.println("case #"+i+": "+r);
    }
    else if(c!=0)
    {
        i++;
        
        c=0;
        r="";
        System.out.println("case #"+i+": IMPOSSIBLE");
    }
    
    
    if(i!=n){
    --i;
    }
    
    r="";
}
}
}

Can anyone help me

thank You

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