What can I say...
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
long long int n,c,total=0;
cin>>n>>c;
long long int number[n];
for(long long int i=0;i<n;i++)
{
cin>>number[i];
}
for (long long i = 0; i < n; i++)
{
for (long long j = 0; j < n; j++)
{
if (number[i] - number[j] == c)
{
total++;
}
}
}
cout<<total;
return 0;
}