public static int toys(List<Integer> w) {
        // goal: determine the min amt of subarrays that can be created based on the container rule
        if(w.size() == 1) return 1;
        
        //sort arr
        Collections.sort(w);
        
        //iterate over each val until it reaches the max container val and increment the container count
        int maxContainerVal = w.get(0) + 4;
        int containers = 1;
        for(int i = 0; i < w.size(); i++){
            if(w.get(i) > maxContainerVal){
                maxContainerVal = w.get(i) + 4;
                containers++;
            }
        }
        return containers;
    }