846

class Solution {
public:
    bool isNStraightHand(vector<int>& A, int k) {
        map<int, int> c;
        for(int i : A) c[i]++;
        for(auto it : c)
            if(c[it.first] > 0)
                for(int i = k - 1; i >= 0; --i)
                    if((c[it.first + i] -= c[it.first]) < 0)
                        return false;
        return true;
    }
};