#include<iostream>
#include<algorithm>
#include <iomanip>
using namespace std;
int cc[0x0FFFFFFF];
int main()
{
cc[0x0FFFFFF]=13;
int a,b;
cin>>a>>b;
cout<<a+b;
return 0;
}
0x0FFFFFFF -256M

Maybe optimizer throws out your array? If to do

cin  >> cc[0x0ffffffd] >> cc[0x0ffffffe];
cout << cc[0x0ffffffd] +  cc[0x0ffffffe];

?