(C) Убийство монстра (Codeforcces)

#include <bits/stdc++.h>

using namespace std;

bool can(long long hc, long long dc, long long hm, long long dm) {
    long long cnta = (hc + dm - 1) / dm;
    long long cntb = (hm + dc - 1) / dc;
    return cnta >= cntb;
}

int main(){
    int T;
    cin >> T;
    while (T--) {
        long long hc, dc, hm, dm, k, w, a;
        cin >> hc >> dc >> hm >> dm >> k >> w >> a;
        bool ok = 0;
        for (int i = 0; i <= k; i++) {
            if (can(hc + i * a, dc + (k - i) * w, hm, dm)) {
                ok = 1;
                break;
            }
        }
        if (ok) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }
}