Spoj enough of analyzing lets play

#include<stdio.h>
int main(){
int t,a,n,i,j,b,u,ar[10000],c=1;
scanf("%d",&t);
while(t--){
j=0;
scanf("%d",&n);
scanf("%d",&ar[0]);
if(n>=2){
scanf("%d",&ar[1]);
u=ar[0]^ar[1];
}
for(i=2;i<n;i++){
scanf("%d",&ar[i]);
u^=ar[i];
}
if(n==1){
printf("Case %d: 1\n",c);
}else{
for(i=0;i<n;i++){
a=u^ar[i];
if(a<ar[i]){
j++;
}
}
printf("Case %d: %d\n",c,j);
}
c++;
}
return 0;
}