int birthday(vector<int> s, int d, int m) {
    int nCombos = 0;
    for(int i = 0; i < s.size() ; i++){
        if(std::accumulate(s.begin() + i, s.begin() + i + m, 0) == d){
            nCombos +=1;
        }
    }
    return nCombos;
}