Codeforces Arpa’s obvious problem and Mehrdad’s terrible solution

//I am struggling
//Just Not Good at it

#include<bits/stdc++.h>

using namespace std;

#define fast ios_base::sync_with_stdio(false)
#define bfast cin.tie(0)
#define outs(x) cout << x << " "
#define outn(x) cout << x << "\n"
#define sf scanf
#define pf printf
#define nl puts("")
#define psb push_back

typedef long long LL;
typedef vector<int>vii;
typedef vector<LL>vll;
typedef map<int, int>mpii;

const int mod = 1000007;
const int high = 100003;

int ar[high];

int main()
{
    fast;
    int n , x , i , j ;
    LL p , res=0;
    mpii mp;
    while(cin >> n >> x)
    {
        mp.clear();

        for(i=1; i<=n; i++)
        {
            cin >> ar[i];
            mp[ar[i]]++;
        }

//        for(i=1; i<=n-1; i++)
//        {
//            for(j=i+1; j<=n; j++)
//            {
//                if((ar[i] ^ ar[j]) == x)
//                {
//                    cout << ar[i] << "^" << ar[j] << "=" << (ar[i] ^ ar[j]) << "\n";
//                }
//            }
//        }

        res=0;

        for(i=1; i<=n; i++)
        {
            p = x ^ ar[i];

            res+=mp[p];

            if(p == ar[i]) res--;
        }

        cout << res / 2 << "\n";
    }

    return 0;
}

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