No. of pairs with difference equal to (k) !! method 1.

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 int check(int k, vector<int> arr)
{
    int i, j, sum = 0, x;
    set<int> s;
    map<int, int> mp;
    map<int, int>::iterator it;
    for (auto it : arr)
    {
        mp[it]++;
        s.insert(it);
    }
    for (it = mp.begin(); it != mp.end(); it++)
    {
        x = (it->first) + k;
        if (s.count(x) > 0)
            sum = sum + max((it->second), mp[x]);
    }
    return sum;
}

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