UVA - 12499 - I am Dumb 3

#include <stdio.h>

int main() {
    int x, y, i, cases, j;
    int arr[51];
       scanf("%d",&cases);
       for(i=1;i<cases+1;i++){
            scanf("%d %d",&x,&y);
           
            for(j=0;j<x;j++){
                scanf("%d",&arr[j]);
            }
            arr[x]=y;
            int temp=0;
            for(j = 0; j < x; j+=2){
                temp^= arr[j+1]-arr[j];
            }
            printf("Case %d: ",i);
            if(temp!=0)
                printf("First Player\n");
            else
                printf("Second Player\n");
        }
    return 0;
}