【小码匠自习室】[NOI Online 2020-2 入门组] 未了：可恶的精度会让你焦头烂额

3 6 3
3 5 1
4
1
3
4
5

0
1
2
-1

void coder_solution() {
    // 提升cin、cout效率
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    
    int n, l;
    double v;
    cin >> n >> l >> v;
    vector<double> a(n);
    vector<double> b(n);
    for(int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    
    sort(a.begin(), a.end(), greater<int>());
    
    b[0] = a[0] / v;
    for(int i = 1 ; i < n; ++i) {
        a[i] += a[i - 1];
        b[i] = a[i] / v;
    }
    
    int q, t;
    cin >> q;
    double T = l / v;
    int cnt;
    for(int i = 0; i < q; ++i) {
        cin >> t;
        if(T > t) {
            cout << 0 << endl;
        } else {
            cnt = upper_bound(b.begin(), b.end(), t - T) - b.begin();
            if (cnt >= n) {
                cout << -1 << endl;
            } else {
                cout << cnt + 1 << endl;
            }
        }
    }
}