int Inventory::_findWeightIndex(int first, int last, double weight){
    if(weight <= weightList[first]){ return first; }
    else if(weight >= weightList[last-1]){ return last; }
    else{
        int mid = (first + last)/2;
        if(weight < weightList[mid]){
            return _findWeightIndex(first,mid,weight); // [first,mid)
        }
        else{
            return _findWeightIndex(mid,last,weight); // [mid, last)
        }
    }
}

// Score, date posted rank, #votes for Rock Paper Scissors Lizard Spock
64  28 18
62  55 1
62  65 2
61  64 1
60  29 5
58  27 3
57  32 2
53  61 1
51  42 1
51  16 20
49  31 2
49  49 1
47  34 3
46  56 1
45  24 4
44  48 1
43  40 4
42  20 4
42  53 1
41  12 2
41  13 3
40  23 3
40  46 2
39  62 1
38  38 4
38  33 2
38  43 2
37  50 1
35  15 8
35  58 1
35  54 1
34  3  4
33  10 3
32  4  8
32  44 1
32  14 5
32  17 2
31  19 8
31  45 2
31  51 1
30  1  3
30  60 1
29  22 4
28  25 3
27  57 1
25  30 2
24  2  7
24  39 3

14 7 11
11 8 2
 9 4 4
 8 6 4
 8 3 4
 4 5 3
 2 1 3
 0 2 2