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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define vll vector<ll>
  5. #define vi vector<int>
  6. template <typename T>
  7. ostream &operator<<(ostream &os, vector<T> &v)
  8. {
  9.     for (auto &i : v)
  10.         os << i << ' ';
  11.     return os;
  12. }
  13. template <typename T>
  14. istream &operator>>(istream &is, vector<T> &v)
  15. {
  16.     for (auto &i : v)
  17.         is >> i;
  18.     return is;
  19. }
  20.  
  21. ll gcd(int a, int b)
  22. {
  23.     if (b == 0)
  24.         return a;
  25.     return gcd(b, a % b);
  26. }
  27. int32_t main()
  28. {
  29.     ios::sync_with_stdio(false);
  30.     cin.tie(nullptr);
  31.  
  32.     int a, b;
  33.     cin >> a >> b;
  34.     int g = gcd(a, b);
  35.  
  36.     vi divs;
  37.     for (int i = 1; i * i <= g; i++)
  38.     {
  39.         if (g % i == 0)
  40.         {
  41.             divs.emplace_back(i);
  42.             if (i != g / i)
  43.                 divs.emplace_back(g / i);
  44.         }
  45.     }
  46.  
  47.     sort(divs.begin(), divs.end());
  48.     int q;
  49.     cin >> q;
  50.     while (q--)
  51.     {
  52.         int l, h;
  53.         cin >> l >> h;
  54.  
  55.         auto it = upper_bound(divs.begin(), divs.end(), h) - divs.begin();
  56.         it--;
  57.         if (divs[it] >= l)
  58.             cout << divs[it] << '\n';
  59.         else
  60.             cout << -1 << '\n';
  61.     }
  62.  
  63.     return 0;
  64. }
  65.  
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/QSA5Bz
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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