string twoArrays(int k, vector<int> A, vector<int> B) {
    int c=0;
    for(int i=0;i<A.size();i++){
        if(A[i]/k>0){
            A[i] = k;
        }
        if(B[i]/k>0){
            B[i] = k;
        }
        int d = A[i]+B[i]+c;
        c = d - k;
    }
    if(c<0)return "NO";
    else return "YES";
}